WO2024001817A1 - 光伏变换器以及光伏发电系统 - Google Patents

光伏变换器以及光伏发电系统 Download PDF

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Publication number
WO2024001817A1
WO2024001817A1 PCT/CN2023/100573 CN2023100573W WO2024001817A1 WO 2024001817 A1 WO2024001817 A1 WO 2024001817A1 CN 2023100573 W CN2023100573 W CN 2023100573W WO 2024001817 A1 WO2024001817 A1 WO 2024001817A1
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WIPO (PCT)
Prior art keywords
primary winding
current
magnetic structure
positive
photovoltaic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/100573
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English (en)
French (fr)
Inventor
唐云宇
张瑶佳
石磊
刘超
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Huawei Digital Power Technologies Co Ltd
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Huawei Digital Power Technologies Co Ltd
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Application filed by Huawei Digital Power Technologies Co Ltd filed Critical Huawei Digital Power Technologies Co Ltd
Priority to EP23829997.8A priority Critical patent/EP4398481A4/en
Publication of WO2024001817A1 publication Critical patent/WO2024001817A1/zh
Priority to US18/630,167 priority patent/US20240258026A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/12—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC
    • G05F1/32—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC using magnetic devices having a controllable degree of saturation as final control devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/12—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC
    • G05F1/13—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC using ferroresonant transformers as final control devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/12—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC
    • G05F1/24—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC using bucking or boosting transformers as final control devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop

Definitions

  • the present application relates to the field of electrical equipment, and in particular, to a photovoltaic converter and a photovoltaic power generation system.
  • the photovoltaic converter is the core component of the photovoltaic power generation system.
  • the photovoltaic converter is used to convert the direct current output from the photovoltaic module into alternating current output.
  • CT current transformers
  • photovoltaic modules usually output multiple channels of DC power to the photovoltaic converter.
  • multiple current transformers are used to collect arc signals for each DC power channel separately. There are problems such as poor collection efficiency, complex structure, and high cost.
  • This application provides a photovoltaic converter and a photovoltaic power generation system, aiming to solve the problems of poor acquisition efficiency, complex structure and high cost of the arc signal acquisition scheme.
  • embodiments of the present application provide a photovoltaic converter for electrically connecting with a first photovoltaic module and a second photovoltaic module.
  • the first photovoltaic module includes a first positive output terminal and a first negative output terminal
  • the second photovoltaic module includes a second positive output terminal and a second negative output terminal.
  • Photovoltaic converters include current transformers and power conversion circuits.
  • the current transformer includes a magnetic structure, a first positive primary winding, a second positive primary winding, a negative primary winding and a first secondary winding.
  • the first positive primary winding passes through the magnetic structure.
  • the first positive primary winding includes a first end and a second end.
  • the first end is electrically connected to the first positive output end, and the second end is connected to the power
  • the conversion circuit is electrically connected.
  • the second positive primary winding passes through the magnetic structure and is spaced apart from the first positive primary winding.
  • the second positive primary winding includes a third end and a fourth end.
  • the third end is connected to the second positive output.
  • the fourth end is electrically connected to the power conversion circuit.
  • the negative primary winding passes through the magnetic structure and is spaced apart from the first positive primary winding and the second positive primary winding.
  • the negative primary winding includes a fifth end and a sixth end, and the fifth end is connected to the first
  • the negative output terminal is electrically connected to the second negative output terminal, and the sixth end is electrically connected to the power conversion circuit.
  • the first secondary winding is wound on the magnetic structure. The first secondary winding is used to couple and output the first induction according to the current transmitted in the first positive primary winding, the second positive primary winding and the negative primary winding. current.
  • the direct current output by the first photovoltaic module and the second photovoltaic module is transported to the power conversion circuit through the current transformer, and the power conversion circuit outputs alternating current according to the direct current.
  • Current transformers can be used to detect arcing on the DC side of photovoltaic converters.
  • an arcing fault occurs on the DC side of the photovoltaic converter (for example, an arcing fault occurs in the first photovoltaic module or the second photovoltaic module due to aging)
  • the DC current received by the DC side of the photovoltaic converter will have an arcing signal (a kind of arcing fault). Differential mode signal)
  • the current transformer collects the arcing signal from the above DC current to facilitate subsequent detection of the arcing signal.
  • the current transformer transmits multiple currents received from the DC side of the photovoltaic converter through the first positive primary winding, the second positive primary winding and the negative primary winding.
  • the first secondary winding The magnetic flux generated by the current transmitted on the side winding and the first induced current are output, and the arcing signal can be transmitted to subsequent devices along with the first induced current output by the first secondary winding to detect the arcing signal.
  • the arcing signals of multiple currents received from the DC side of the photovoltaic converter can be collected at one time, so that the arcing signals in the multiple currents can be detected at once to avoid Each current channel collects arc signals separately, thereby avoiding repeated detection of arc signals in multiple current channels.
  • the design of the current transformer is not only conducive to improving the arc signal collection efficiency, but also has a simple structure, which is conducive to reducing detection costs. It is also conducive to reducing the number of current transformers and reducing the floor area, which is conducive to photovoltaic conversion. Miniaturized design of the device.
  • the first end, the third end and the sixth end are located on one side of the magnetic structure, and the fifth end, the fourth end and the second end are located on the other side of the magnetic structure.
  • the DC current received by the DC side of the photovoltaic converter will also contain a common mode noise signal, that is, the first photovoltaic module will output a first differential mode current and a first common mode current.
  • the second photovoltaic module will output a second differential mode current and a second common mode current.
  • the first positive primary winding transmits a first differential mode current and a first common mode current, and both the first differential mode current and the first common mode current flow from the first end to the second end.
  • the second positive primary winding transmits a second differential mode current and a second common mode current, and both the second differential mode current and the second common mode current flow from the third end to the fourth end.
  • the negative primary winding transmits the third differential mode current (the combined current of the first differential mode current and the second differential mode current) and the third common mode current (the combined current of the first common mode current and the second common mode current).
  • the third differential mode current flows from the sixth end to the fifth end
  • the third common mode current flows from the fifth end to the sixth end.
  • the magnetic flux generated in the magnetic structure cancels out, thereby achieving the effect of suppressing the common mode current, reducing the noise impact caused by the common mode current, achieving independent measurement of the differential mode current, and facilitating subsequent detection of arcing signals. , which is conducive to improving the accuracy and speed of subsequent arc detection.
  • the magnetic structure has a traveling channel
  • the first positive primary winding includes a first connecting part
  • the second positive primary winding includes a first fixing part
  • the negative primary winding includes a first conductive part
  • the first connecting part, the first fixing part and the first conductive part all pass through the through channel and are arranged at intervals, and the first conductive part is located between the first connecting part and the first fixing part;
  • the first end and the second end are located at opposite ends of the first connecting part, the third end is located at one end of the first fixing part facing the first end, and the fourth end
  • the fifth end is located at the other end of the first fixing part facing the second end, the fifth end is located at one end of the first conductive part facing the second end and the fourth end, and the sixth end is located at the first conductive part facing the first end. and the other end of the third end.
  • the first connection part of the first positive primary winding, the first fixed part of the second positive primary winding, and the first conductive part of the negative primary winding all pass through the traveling channel of the magnetic structure, this enables transmission
  • the magnetic flux generated by the common mode current on the three primary windings has the same magnetic path, which is more conducive to suppressing the noise impact caused by the common mode current, improving the current transformer's ability to suppress common mode noise, and more It is beneficial to the subsequent detection of arc signals.
  • the first conductive part is located between the first connecting part and the first fixed part, it is beneficial for the sum of the magnetic flux generated by the common mode current transmitted in the first connecting part and the first fixed part to be in the first conductive part.
  • the magnetic flux generated by the transmitted common mode current cancels out, which further improves the current transformer's ability to suppress common mode noise and is more conducive to subsequent detection of arcing signals.
  • the photovoltaic converter further includes a circuit board, the circuit board is electrically connected to the first photovoltaic module and the second photovoltaic module, and the circuit board is connected to the first end, the second end, the third end, The fourth end, the fifth end, the sixth end and the power conversion circuit are fixedly and electrically connected.
  • the first end and the second end are both located on the side of the fifth end close to the sixth end.
  • the third end and the fourth end are both located on the side of the sixth end close to the fifth end.
  • the current transformer and the power conversion circuit are electrically connected through the circuit board and formed as a whole, and the current transformer can be electrically connected to the first photovoltaic module and the second photovoltaic module through the circuit board.
  • two ends of each winding of the current transformer can be connected one by one to a plurality of traces provided on the circuit board to be electrically connected to other electronic devices. Since the first end and the second end are both located on the side of the fifth end facing the sixth end, the third end and the fourth end are both located on the side of the sixth end facing the fifth end.
  • circuit board with current transformer wiring designed in this way it is possible to avoid the intersection of multiple traces connected to the above-mentioned ends, avoid the problem of difficult wiring on the board, and facilitate the arrangement of traces on the circuit board. , reducing wiring difficulties and reducing wiring design costs.
  • the first conductive part is located between the first connecting part and the first fixing part, and along the extension direction of the traveling channel, the fifth end part and the sixth end part Dislocated arrangement; in the first direction, the third end and the fourth end are both located between the fifth end and the sixth end, and the first end is located on the side of the third end facing away from the sixth end. , the second end is located on the side of the fourth end facing away from the fifth end; the first direction is perpendicular to the extension direction of the through passage and perpendicular to the height direction of the magnetic structure.
  • the circuit board laid out according to the current transformer designed in this way can avoid the intersection of multiple traces arranged on it and connected to the ends of each winding, avoid the problem of difficult wiring on the board, and facilitate the installation on the circuit board.
  • Setting up wiring reduces wiring difficulties and reduces wiring design costs; moreover, while avoiding wiring crossovers, it improves the space utilization of the current transformer, which is beneficial to reducing the current transformer's floor area and is beneficial to Miniaturized design of current transformer.
  • the first conductive part is located between the first connecting part and the first fixing part, and along the extension direction of the traveling channel, the fifth end part and the sixth end part Dislocated arrangement; in the first direction, the third end and the second end are both located between the fifth end and the sixth end, and the first end is located on the side of the third end facing away from the sixth end. , the fourth end is located on the side of the second end facing away from the fifth end; the first direction is perpendicular to the extension direction of the through passage and perpendicular to the height direction of the magnetic structure.
  • the circuit board laid out according to the current transformer designed in this way can avoid the intersection of multiple traces arranged on it and connected to the ends of each winding, avoid the problem of difficult wiring on the board, and facilitate the installation on the circuit board.
  • Setting up wiring reduces wiring difficulties and reduces wiring design costs; moreover, while avoiding wiring crossovers, it improves the space utilization of the current transformer, which is beneficial to reducing the current transformer's floor area and is beneficial to Miniaturized design of current transformer.
  • the first positive primary winding includes a second connection part and a third connection part, both of the second connection part and the third connection part extend along the height direction of the magnetic structure, and the second connection part and the third connection part extend along the height direction of the magnetic structure.
  • the three connecting parts are respectively connected to opposite ends of the first connecting part.
  • the second connecting part and the third connecting part are located on opposite sides of the magnetic structure.
  • the end of the second connecting part facing away from the first connecting part is the first end. part, and the end of the third connecting part facing away from the first connecting part is the second end.
  • the second positive primary winding includes a second fixed part and a third fixed part. Both the second fixed part and the third fixed part extend along the height direction of the magnetic structure.
  • the second fixed part and the third fixed part are respectively connected with the first fixed part.
  • the opposite ends of the part are connected, the second fixing part is located on the side of the magnetic structure facing the second connecting part and is spaced apart from the second connecting part, the third fixing part is located on the side of the magnetic structure facing the third connecting part, and It is spaced apart from the third connecting part, and the end of the second fixing part faces away from the first fixing part. is the third end, and the end of the third fixing part facing away from the first fixing part is the fourth end.
  • the negative primary winding includes a second conductive part and a third conductive part. Both the second conductive part and the third conductive part extend along the height direction of the magnetic structure. The second conductive part and the third conductive part are respectively connected with the first conductive part. The opposite ends are connected, the second conductive part is located on the side of the magnetic structure facing the third connecting part and the third fixing part, and is spaced from the third connecting part and the third fixing part, and the third conductive part is located on the side of the magnetic structure facing the third connecting part and the third fixing part. One side of the second connecting part and the second fixing part is spaced apart from the second connecting part and the second fixing part. The end of the second conductive part facing away from the first conductive part is the fifth end. The third conductive part The end facing away from the first conductive part is the sixth end.
  • the structure of the first positive primary winding, the second positive primary winding and the negative primary winding arranged in this way is stable, which is beneficial to improving the overall structural stability of the current transformer and is easy to connect to the circuit board, thereby facilitating the current mutual inductance.
  • the device is mounted on the circuit board, which helps reduce the difficulty of assembly.
  • the first connecting part, the first fixing part, and the first conductive part all extend along the extension direction of the traveling channel.
  • each differential mode current transmitted in the first connecting part, the first fixed part and the first conductive part and each Common-mode currents can pass vertically through magnetic structures.
  • the magnetic flux generated by the common mode current and the differential mode current in the magnetic structure will be larger, which facilitates the first secondary winding to output the first induced current.
  • the distance between the first end and the second end, the distance between the third end and the fourth end, and the distance between the fifth end and the sixth end is equal.
  • the projection of the first connecting part, the projection of the first fixing part and the projection of the first conductive part all overlap.
  • the magnetic structure is provided with an air gap, and the air gap is connected to the traveling channel.
  • the design of the air gap effectively reduces the magnetic permeability of the magnetic structure, effectively increases the saturation magnetization intensity of the magnetic structure, and avoids magnetic saturation of the magnetic structure during operation.
  • the structure is simple and easy to design.
  • the magnetic structure includes a first magnetic core and a second magnetic core.
  • the first magnetic core and the second magnetic core are spaced apart and opposite and have an air gap.
  • the length of the air gap can be changed, thereby changing the magnetic permeability and saturation magnetization of the magnetic structure, making it easy to adjust the magnetic permeability and saturation of the magnetic structure as needed.
  • the magnitude of the magnetization intensity is used to avoid magnetic saturation in the magnetic structure during operation. Not only is the difficulty of adjustment easy, but it also avoids multiple processing of the first magnetic core and the second magnetic core, which is beneficial to saving processing costs.
  • the current transformer further includes a fixing part, the magnetic structure is fixedly connected to the fixing part, and the first positive primary winding, the second positive primary winding and the negative primary winding are installed in the fixing part.
  • the first end, the second end, The third end, the fourth end, the fifth end and the sixth end are located on a side of the fixing member facing away from the magnetic structure.
  • the magnetic structure, the first positive primary winding, the second positive primary winding and the negative primary winding are assembled together through the fixing member.
  • the structure is simple and stable, which is beneficial to improving the overall structural stability of the current transformer.
  • the design in which the first end, the second end, the third end, the fourth end, the fifth end and the sixth end are located on the side of the fixing member facing away from the magnetic structure facilitates the connection between the current transformer and the circuit. Board installation reduces the difficulty of assembly.
  • the current transformer further includes a second secondary winding.
  • the second secondary winding is wound on the magnetic structure and is spaced apart from the first secondary winding.
  • the second secondary winding is used to transmit data based on the transmission.
  • the current coupling in the first positive primary winding, the second positive primary winding and the negative primary winding outputs a second induced current.
  • the second secondary winding can also generate a magnetic flux and output a current based on the current transmitted on each primary winding. If the number of turns of the second secondary winding and the first secondary winding are different, the magnitude of the current output by the second secondary winding is different from the magnitude of the current output by the first secondary winding; The number of turns of the side windings is the same, and the current output by the second secondary winding is the same as the current output by the first secondary winding.
  • the current transformer can be equipped with multiple secondary windings with different or the same number of turns to output multiple channels of the same or different currents that meet the needs.
  • the power conversion circuit includes a boost module and an inverter module.
  • the boost module is electrically connected to the second end, the fourth end and the sixth end, and is electrically connected to the inverter module. .
  • the boost module outputs the boost current to the inverter module, and the inverter module can invert the boost current to output AC power is supplied to the AC load.
  • the design of the boost module ensures that the AC power output by the inverter module after inversion processing meets expectations.
  • the photovoltaic converter further includes a detection module, and the detection module is electrically connected to the first secondary winding.
  • the detection module can perform arc detection on the first induced current output by the first secondary winding to avoid various safety accidents due to arc faults.
  • embodiments of the present application also provide a photovoltaic power generation system, including the photovoltaic converter described in any one of the first aspects, a first photovoltaic module and a second photovoltaic module.
  • the first photovoltaic module includes a first positive output terminal and a first negative output terminal
  • the second photovoltaic module includes a second positive output terminal and a second negative output terminal
  • the first positive output terminal is electrically connected to the first terminal
  • the second positive output terminal is electrically connected to the third terminal.
  • the first negative output terminal and the second negative output terminal are both electrically connected to the fifth terminal.
  • Figure 1 is a structural block diagram of the photovoltaic power generation system and AC load provided by the embodiment of the present application;
  • FIG. 2 is a schematic structural diagram of the photovoltaic power generation system shown in Figure 1;
  • Figure 3 is a schematic three-dimensional structural diagram of a current transformer provided by an embodiment of the present application.
  • Figure 4 is a schematic three-dimensional structural diagram of the fixing member in the current transformer shown in Figure 3;
  • Figure 5 is a schematic three-dimensional structural diagram of the magnetic structure in the current transformer shown in Figure 3;
  • Figure 6 is a structural schematic diagram of the fixing part and the magnetic structure in the current transformer shown in Figure 3 from another angle;
  • Figure 7 is a schematic three-dimensional structural diagram of the first positive primary winding in the current transformer shown in Figure 3;
  • Figure 8 is a partial structural diagram cut along line A-A after the current transformer shown in Figure 3 is matched with the circuit board;
  • Figure 9 is a schematic three-dimensional structural diagram of the second positive primary winding in the current transformer shown in Figure 3;
  • Figure 10 is a schematic three-dimensional structural diagram of the negative primary winding in the current transformer shown in Figure 3;
  • Figure 11 is a schematic three-dimensional structural diagram of the current transformer shown in Figure 3 (omitting the fixing member, the first secondary winding and the second secondary winding);
  • Figure 12 is a schematic diagram of the direction in which the magnetic structure of the current transformer shown in Figure 11 is passed through by the first differential mode current, the second differential mode current and the third differential mode current to generate magnetic flux;
  • Figure 13 is a schematic diagram of the direction of the magnetic flux generated by the first common mode current, the second common mode current and the third common mode current passing through the magnetic structure of the current transformer shown in Figure 11;
  • Figure 14 is a schematic three-dimensional structural diagram of a current transformer provided by yet another embodiment of the present application.
  • Figure 15 is a partial structural schematic diagram cut along line B-B after the current transformer shown in Figure 14 is matched with the circuit board.
  • the embodiment of the present application provides a photovoltaic converter, which is used in a photovoltaic power generation system.
  • Photovoltaic power generation system is a power generation system that uses the photovoltaic effect to directly convert solar radiation energy into electrical energy.
  • the connection between component A and component B refers to the direct connection or indirect connection between component A and component B; where the connection includes fixed connection and electrical connection.
  • Figure 1 is a structural block diagram of the photovoltaic power generation system 1000 and the AC load 2000 provided by the embodiment of the present application.
  • Figure 2 is a schematic structural diagram of the photovoltaic power generation system 1000 shown in Figure 1.
  • the photovoltaic power generation system 1000 is used to convert solar radiation energy into electrical energy to supply the AC load 2000 .
  • the photovoltaic power generation system 1000 includes a first photovoltaic module 900, a second photovoltaic module 900a, a first cable assembly 800, a photovoltaic converter 800a and a second cable assembly 800b.
  • the first photovoltaic module 900 and the second photovoltaic module 900a are used to convert solar energy into direct current output.
  • the first photovoltaic module 900 and the second photovoltaic module 900a are connected to the first cable assembly 800.
  • the first cable assembly 800 is connected to the photovoltaic converter 800a.
  • the first cable assembly 800 is used to connect the first photovoltaic module 900 and the second photovoltaic module 900a.
  • the direct current output by the photovoltaic module 900a is transmitted to the photovoltaic converter 800a.
  • the photovoltaic converter 800a is used to convert the DC power output by the first photovoltaic module 900 and the second photovoltaic module 900a into AC power for output.
  • the second cable assembly 800b is connected to the photovoltaic converter 800a and the AC load 2000.
  • the second cable assembly 800b is used to transmit the AC power output by the photovoltaic converter 800a to the AC load 2000 to supply the AC load 2000.
  • the AC load 2000 can be any equipment or device that uses, stores or transmits AC power, such as a refrigerator, an air conditioner, a municipal network, etc. This application is not limited to this.
  • the number of the first photovoltaic modules 900 can also be more, such as two, three, four, etc.; the number of the second photovoltaic modules 900a can also be more, such as two, Three, four, etc.
  • the photovoltaic converter 800a includes a circuit board 700, an input terminal 600, a current transformer 500, a boost module 400, an inverter module 300, an output terminal 200, a control module 100 and a detection module 100a.
  • the boost module 400, the inverter module 300 and the control module 100 constitute the power conversion circuit 100b.
  • the power conversion circuit 100b includes a boost module 400, an inverter module 300 and a control module 100.
  • the photovoltaic converter 800a includes a circuit board 700, an input terminal 600, a current transformer 500, a power conversion circuit 100b, an output terminal 200 and a detection module 100a.
  • the circuit board 700 is used to carry the input terminal 600, the current transformer 500, the boost module 400, the inverter module 300, the output terminal 200, the control module 100 and the detection module 100a.
  • the input terminal 600 is electrically connected to the current transformer 500 .
  • the current transformer 500 is electrically connected to the boost module 400 .
  • the boost module 400 is electrically connected to the inverter module 300 .
  • the inverter module 300 is electrically connected to the output terminal 200 .
  • the control module 100 is electrically connected to the boost module 400, the inverter module 300 and the detection module 100a.
  • the detection module 100a is electrically connected to the current transformer 500.
  • the control module 100 is used to control the operation of the boost module 400, the inverter module 300 and the detection module 100a to control the operation of the photovoltaic converter 800a.
  • the input terminal 600 is connected to the first cable assembly 800 . Through the first cable assembly 800, the input terminal 600 is electrically connected to the first photovoltaic module 900 and the second photovoltaic module 900a.
  • the output terminal 200 is connected to the second cable assembly 800b. Through the second cable assembly 800b, the output terminal 200 is electrically connected to the AC load 2000. It can be understood that the circuit board 700 is electrically connected to the input terminal 600 and the first photovoltaic module 900 and the second photovoltaic module 900a through the first cable assembly 800.
  • the DC power output by the first photovoltaic module 900 and the second photovoltaic module 900a is sequentially transmitted to the boost module 400 along the first cable assembly 800 through the input terminal 600 and the current transformer 500.
  • the boost module 400 is used to boost the DC power output by the first photovoltaic module 900 and the second photovoltaic module 900a, and then output the boost current to the inverter module 300; wherein the boost current is a DC power.
  • the inverter module 300 is used to perform inverter processing on the DC power (ie boosted current) that has been boosted by the boost module 400 , so as to convert the boosted current into AC power and deliver it to the output terminal 200 .
  • the AC power is transmitted to the AC load 2000 along the second cable assembly 800b through the output terminal 200 to supply the AC load 2000. It can be understood that the current output by the first photovoltaic module 900 and the second photovoltaic module 900a is transmitted to the power conversion circuit 100b through the current transformer 500, and AC power is output through the power conversion circuit 100b to supply the AC load 2000.
  • the current transformer 500 is used to output an induced current to the detection module 100a according to the direct current output by the first photovoltaic module 900 and the second photovoltaic module 900a; wherein the value of the induced current is smaller than the value of the direct current.
  • the detection module 100a is used to perform arc detection on the induced current to determine whether there is an arc signal in the induced current. If the detection module 100a detects an arc signal in the induced current, it outputs a control signal to the control module 100. The control signal is used to control the photovoltaic converter 800a to stop working.
  • the arcing signal refers to a differential mode current signal generated when a DC arcing phenomenon occurs in the photovoltaic power generation system 1000 (for example, a DC arcing phenomenon occurs in the first photovoltaic module 900 and the second photovoltaic module 900a due to aging).
  • the first photovoltaic module 900 and the second photovoltaic module 900a each include a plurality of solar cells, and a plurality of solar cell arrays are arranged.
  • the first photovoltaic module 900 includes a first positive output terminal 901 and a first negative output terminal 902.
  • the first positive output terminal 901 is located on one side of the first negative output terminal 902 and is spaced apart.
  • the potential of the first negative output terminal 902 is lower than the potential of the first positive output terminal 901 .
  • the first positive output terminal 901 is used to output the first differential mode current I1, and the first negative output terminal 902 is used to receive the first differential mode current I1.
  • the second photovoltaic module 900a is located on one side of the first photovoltaic module 900.
  • the second photovoltaic module 900a includes a second positive output terminal 903 and a second negative output terminal 904.
  • the second positive output terminal 903 is located on one side of the second negative output terminal 904. Side and spaced settings.
  • the potential of the second negative output terminal 904 is lower than the potential of the second positive output terminal 903 .
  • the second positive output terminal 903 is used to output the second differential mode current I2, and the second negative output terminal 904 is used to receive the second differential mode current I2.
  • the second positive output terminal 903 is located on a side of the first positive output terminal 901 facing away from the first negative output terminal 902, and the second negative output terminal 904 is located on a side of the first negative output terminal 902 facing away from the first positive output terminal 901. side.
  • the value of the second differential mode current I2 is equal to the value of the first differential mode current I1. In some other embodiments, the value of the first differential mode current I1 and the value of the second differential mode current I2 may also be unequal, which is not limited in this application.
  • the first cable assembly 800 includes a first cable 801, a second cable 802, a third cable 803 and a fourth cable 804.
  • the second cable 802, the first cable 801, the third cable 803 and the fourth cable 804 are arranged at intervals in sequence.
  • the first cable 801 is connected to the first positive output terminal 901 and the input terminal 600 of the photovoltaic converter 800a.
  • the second cable 802 is connected to the second positive output terminal 903 and the input terminal 600 of the photovoltaic converter 800a.
  • the third cable 803 is connected to the first negative output terminal 902 and the input terminal 600 of the photovoltaic converter 800a.
  • the fourth cable 804 is connected to the second negative output terminal 904 and the input terminal 600 of the photovoltaic converter 800a.
  • the first photovoltaic module 900 communicates with the light through the first cable 801 and the third cable 803.
  • the input terminal 600 of the volt converter 800a is electrically connected.
  • the first differential mode current I1 output by the first photovoltaic module 900 from the first positive output terminal 901 is transmitted to the photovoltaic converter 800a along the first cable 801 through the input terminal 600.
  • After passing through the photovoltaic converter 800a it passes through the input terminal 600 along the third The cable 803 flows back to the first negative output terminal 902 .
  • the second photovoltaic module 900a is electrically connected to the input terminal 600 of the photovoltaic converter 800a through the second cable 802 and the fourth cable 804.
  • the second differential mode current I2 output by the second photovoltaic module 900a from the second positive output terminal 903 is transported to the photovoltaic converter 800a along the second cable 802 through the input terminal 600. After passing through the photovoltaic converter 800a, it passes through the input terminal 600 along the fourth Cable 804 flows back to second negative output 904 .
  • the photovoltaic converter 800a when the first differential mode current I1 output by the first positive output terminal 901 of the first photovoltaic module 900 flows back to the first negative output terminal 902 through the photovoltaic converter 800a, the photovoltaic converter 800a will generate a noise signal. , the noise signal exists in the first differential mode current I1; in the process of the second differential mode current I2 output by the second positive output terminal 903 of the second photovoltaic module 900a flowing back to the second negative output terminal 904 through the photovoltaic converter 800a, The photovoltaic converter 800a generates a noise signal, and the noise signal is present in the second differential mode current I2.
  • the noise signal includes the common mode noise signal, that is, the common mode current (from a pair of positive input terminals and negative output terminals of a system, if the direction of the current is the same, the current is called a common mode current).
  • the first common mode current I1a exists in the first differential mode current I1 transmitted in the first cable 801 and the third cable 803; wherein, the first differential mode current I1 transmitted in the first cable 801
  • the direction of the mode current I1 and the first common mode current I1a are the same, and the direction of the first differential mode current I1 transmitted in the third cable 803 is opposite to the direction of the first common mode current I1a.
  • the second differential mode current I2a in the second differential mode current I2 transmitted in the second cable 802 and the fourth cable 804; wherein, the second differential mode current I2 transmitted in the second cable 802 is different from the second common mode current I2.
  • the direction of the common mode current I2a is the same, and the direction of the second differential mode current I2 transmitted in the fourth cable 804 is opposite to the direction of the second common mode current I2a.
  • the value of the first common mode current I1a is equal to the value of the second common mode current I2a. In some other embodiments, the value of the first common mode current I1a and the value of the second common mode current I2a may also be different.
  • the second cable assembly 800b includes three fifth cables 805, and the three fifth cables 805 are arranged at intervals in sequence. One end of each fifth cable 805 is connected to the output terminal 200 of the photovoltaic converter 800a, and the other end is connected to the AC load 2000. The AC power output by the photovoltaic converter 800a is transmitted to the AC load 2000 through three fifth cables 805. In some other embodiments, the number of fifth cables 805 may be more, such as six, nine, twelve, etc., which is not specifically limited in this application.
  • the circuit board 700 is a rectangular circuit board. In some other embodiments, the circuit board 700 may also be a circular circuit board or a triangular circuit board or other special-shaped circuit board. This application does not specifically limit the shape of the circuit board.
  • the circuit board 700 is provided with functional circuits, which include a first circuit 701, a second circuit 702, a third circuit 703, a fourth circuit 704, a fifth circuit 705, a sixth circuit 706, a seventh circuit 707 and an eighth circuit. 708.
  • each of the above lines is a conductive layer provided on the circuit board 700 using conductive materials such as copper and aluminum.
  • Each of the above circuits will be described below in conjunction with each module of the photovoltaic converter 800a.
  • the input terminal 600 is provided on one side of the circuit board 700 .
  • the input terminal 600 is disposed on one side of the circuit board 700 in the length direction.
  • the input terminal 600 includes a first connection terminal 601, a second connection terminal 602 and a third connection terminal 603.
  • the second connection terminals 602 , the first connection terminals 601 and the third connection terminals 603 are sequentially arranged on one side of the circuit board 700 .
  • the first connection terminal 601 is connected to the first cable 801
  • the second connection terminal 602 is connected to the second cable 802
  • the third connection terminal 603 is connected to the third cable 803 and the fourth cable 804.
  • the input terminal 600 may also include more connection terminals, such as four, five, etc., which is not specifically limited in this application.
  • the current transformer 500 is located at one end of the input terminal 600 and is electrically connected to the input terminal 600 . Specifically, the current transformer 500 is located at one end of the first connection terminal 601 , the second connection terminal 602 and the third connection terminal 603 , and is located on one side of the second connection terminal 602 . Among them, the current transformer 500 and the first terminal 601, the second terminal 602 and the third terminal 603 are electrically connected.
  • the first line 701 is located between the input terminal 600 and the current transformer 500 and is connected to the input terminal 600 and the current transformer 500.
  • the first line 701 is used to realize the electrical connection between the input terminal 600 and the current transformer 500.
  • the first line 701 includes a first wiring 7011, a second wiring 7012, and a third wiring 7013.
  • the second trace 7012, the first trace 7011 and the third trace 7013 are arranged in sequence. Among them, one end of the first trace 7011 is connected to the first terminal 601 and the other end is connected to the current transformer 500 .
  • One end of the second trace 7012 is connected to the second terminal 602 , and the other end is connected to the current transformer 500 .
  • One end of the third trace 7013 is connected to the third terminal 603 , and the other end is connected to the current transformer 500 .
  • the first wiring 7011, the second wiring 7012, and the third wiring 7013, the first connection terminal 601, the second connection terminal 602, and the third connection terminal 603 are electrically connected to the current transformer 500 respectively.
  • the boost module 400 is located at an end of the current transformer 500 facing away from the input terminal 600 and is electrically connected to the current transformer 500 .
  • the boost module 400 includes a first boost unit 401 and a second boost unit 402.
  • the first voltage boosting unit 401 and the second voltage boosting unit 402 are spaced apart and opposite, wherein the first voltage boosting unit 401 is located at one end of the current transformer 500 and is electrically connected to the current transformer 500;
  • the second voltage boosting unit 402 is located at one end of the current transformer 500 and on one side of the current transformer 500 , and is electrically connected to the current transformer 500 .
  • the second line 702 is located between the current transformer 500 and the boost module 400 and is connected to the current transformer 500 and the boost module 400.
  • the second line 702 is used to realize the electrical connection between the current transformer 500 and the boost module 400. sexual connection.
  • the second line 702 includes a fourth line 7021, a fifth line 7022, a sixth line 7023, a seventh line 7024, and an eighth line 7025.
  • the fourth trace 7021, the fifth trace 7022, and the sixth trace 7023 are arranged in sequence.
  • the seventh trace 7024 crosses the fifth trace 7022 and is connected to the sixth trace 7023.
  • one end of the seventh trace 7024 is connected to one end of the sixth trace 7023, and the other end of the seventh trace 7024 is located between the fourth trace 7021 and the fifth trace 7022.
  • the eighth trace 7025 is located on the side of the fifth trace 7022 facing away from the fourth trace 7021, and is connected to the sixth trace 7023 and the seventh trace 7024.
  • one end of the eighth trace 7025 is connected to an end connected to the sixth trace 7023 and the seventh trace 7024.
  • One end of the fourth trace 7021 is connected to the current transformer 500, and the other end is connected to the second boost unit 402; one end of the fifth trace 7022 is connected to the current transformer 500, and the other end is connected to the first boost unit 401;
  • the end of the sixth trace 7023 away from the seventh trace 7024 and the eighth trace 7025 is connected to the current transformer 500; the end of the seventh trace 7024 away from the sixth trace 7023 is connected to the second boost unit 402; the eighth One end of the trace 7025 away from the sixth trace 7023 is connected to the first boosting unit 401 .
  • the second boost unit 402 is electrically connected to the current transformer 500; through the fifth wiring 7022, the eighth wiring 7025, and the sixth wiring Line 7023, the first voltage boosting unit 401 is electrically connected to the current transformer 500.
  • the inverter module 300 is located at one end of the boost module 400 facing away from the current transformer 500 and is electrically connected to the boost module 400 . Specifically, the inverter module 300 is electrically connected to the first boost unit 401 and the second boost unit 402 .
  • the third line 703 is located between the boost module 400 and the inverter module 300 and is connected to the boost module 400 and the inverter module 300.
  • the third line 703 is used to realize the electrical connection between the boost module 400 and the inverter module 300. sexual connection.
  • the third line 703 includes a first sub-line 7031 and a second sub-line 7032. Along the width direction of the circuit board 700, the first sub-circuit 7031 and the second sub-circuit 7032 are arranged at intervals.
  • one end of the first sub-line 7031 is connected to the first boost unit 401, and the other end is connected to the inverter module 300; one end of the second sub-line 7032 is connected to the second boost unit 402, and the other end is connected to the inverter module 300. connect.
  • the inverter module 300 is electrically connected to the first voltage boosting unit 401 and the second voltage boosting unit 402 .
  • the output terminal 200 is located on a side of the inverter module 300 facing away from the boost module 400 and is electrically connected to the inverter module 300 .
  • the fourth line 704 is located between the output terminal 200 and the inverter module 300 and is connected to the inverter module 300 and the output terminal 200.
  • the fourth line 704 is used to realize the electrical connection between the output terminal 200 and the inverter module 300.
  • the fourth line 704 includes three output lines 7041. Along the width direction of the circuit board 700, three output traces 7041 are arranged at intervals. One end of each output trace 7041 is connected to the inverter module 300, and the other end is connected to the output terminal 200.
  • the fourth line 704 may also include more output lines 7041, such as six, nine, etc., which is not specifically limited in this application. Among them, the output terminal 200 is connected to the three fifth cables 805 of the second cable assembly 800b.
  • the control module 100 is located at one end of the boost module 400 and is electrically connected to the boost module 400 and the inverter module 300 . Specifically, the control module 100 is located on the side of the second boost unit 402 facing away from the first boost unit 401 .
  • the fifth line 705 is located between the boost module 400 and the inverter module 300 and is connected to the control module 100 and the boost module 400.
  • the fifth line 705 is used to realize the electrical connection between the control module 100 and the boost module 400.
  • the fifth line 705 includes a first control line 7051 and a second control line 7052. Along the width direction of the circuit board 700, the first control traces 7051 and the second control traces 7052 are arranged at intervals.
  • one end of the first control line 7051 is located between the first sub-line 7031 and the second sub-line 7032 and is connected to the first boost unit 401; the other end is located on the second sub-line 7032 facing away from the first sub-line 7031.
  • One side is connected to the control module 100, and the first control line 7051 crosses the second sub-line 7032.
  • the second control trace 7052 is located between the second boost unit 402 and the first control trace 7051.
  • the second control trace 7052 is located between the first control trace 7051 and the second sub-circuit 7032.
  • One end of the second control line 7052 is connected to the second boost unit 402 , and the other end is connected to the control module 100 .
  • the control module 100 is electrically connected to the first voltage boosting unit 401 and the second voltage boosting unit 402 .
  • the sixth line 706 is located on one side of the control module 100 facing the inverter module 300 and on one end of the inverter module 300 facing the control module 100, and is connected to the control module 100 and the inverter module 300.
  • the sixth line 706 is used to realize the electrical connection between the control module 100 and the inverter module 300 .
  • one end of the sixth line 706 is located on the side of the first control line 7051 facing away from the first sub-line 7031 and is connected to the control module 100
  • the other end of the sixth line 706 is connected to the inverter module 300 and faces the control module 100 Connect one end.
  • the control module 100 and the inverter module 300 are electrically connected. Therefore, the control module 100 can control the operation of the first voltage boosting unit 401, the second voltage boosting unit 402 and the inverter module 300.
  • the first differential mode current I1 output by the first photovoltaic module 900 from the first positive output terminal 901 is transmitted to the first terminal 601 along the first cable 801, it is transmitted from the first terminal 601 to the current along the first wiring 7011.
  • Transformer 500 After being transmitted from the current transformer 500 to the second voltage boosting unit 402 along the fourth wiring 7021, it is sequentially transmitted from the second voltage boosting unit 402 to the current transformer 500 along the seventh wiring 7024 and the sixth wiring 7023. Then, after being transported from the current transformer 500 to the third wiring terminal 603 along the third wiring 7013, it flows back from the third wiring terminal 603 to the first negative output terminal 902 along the third cable 803.
  • first differential mode current I1 and the first common mode current I1a are all transmitted in the first trace 7011, the fourth trace 7021 and the third trace 7013.
  • the first differential mode current I1 and the first common mode current I1a transmitted in the first wiring 7011 and the fourth wiring 7021 have the same direction.
  • the first differential mode current I1 and the first common mode current I1a are both transmitted from the first terminal 601 to the current transformer 500 along the first wiring 7011, and then are transmitted to the second boost unit along the fourth wiring 7021. 402.
  • the direction of the first differential mode current I1 transmitted in the third trace 7013 and the sixth trace 7023 is opposite to that of the first common mode current I1a.
  • the first differential mode current I1 is transported to the current transformer 500 along the sixth wiring 7023, it is transported to the third terminal 603 along the third wiring 7013; the first common mode current I1a is transmitted from the third terminal 603 along the third wiring 7013.
  • the third wiring 7013 is sent to the current transformer 500, it is sent to the first boosting unit 401 and the second boosting unit 402 along the sixth wiring 7023.
  • the control module 100 controls the second voltage boosting unit 402 to process the first differential mode current I1.
  • Second step-up order Element 402 performs boosting processing on the first differential mode current I1 and then outputs the first boosted current.
  • the second boosting unit 402 is used to boost the first differential mode current I1 and then output the first boosted current.
  • the first boost current is a direct current
  • the first differential mode current I1 transmitted from the second boost unit 402 to the current transformer 500 along the seventh wiring 7024 and the sixth wiring 7023 is not boosted. deal with.
  • the first boost current is delivered from the second boost unit 402 to the inverter module 300.
  • the control module 100 controls the inverter module 300 to perform inversion processing on the first boost current to convert the first boost current into a first alternating current output.
  • the first AC power is transmitted from the inverter module 300 to the output terminal 200 through the plurality of output wirings 7041, the first AC power is transmitted to the AC load 2000 along the plurality of fifth cables 805 to supply the AC load 2000.
  • the second differential mode current I2 output by the second photovoltaic module 900a from the second positive output terminal 903 is transmitted to the second terminal 602 along the second cable 802, it is transmitted from the second terminal 602 to the current along the second wiring 7012.
  • Transformer 500 After being transmitted from the current transformer 500 to the first voltage boosting unit 401 along the fifth wiring 7022, it is sequentially transmitted from the first voltage boosting unit 401 to the current transformer 500 along the eighth wiring 7025 and the sixth wiring 7023. Then, after being transported from the current transformer 500 to the third wiring terminal 603 along the third wiring 7013, it flows back from the third wiring terminal 603 along the fourth cable 804 to the second negative output terminal 904.
  • both the second trace 7012 and the fifth trace 7022 transmit the second differential mode current I2 and the second common mode current I2a.
  • the directions of the second differential mode current I2 and the second common mode current I2a transmitted in the second wiring 7012 and the fifth wiring 7022 are the same.
  • the second differential mode current I2 and the second common mode current I2a are both transmitted from the second connection terminal 602 to the current transformer 500 along the second wiring 7012, and then are transmitted to the first boost unit along the fifth wiring 7022. 401.
  • the direction of the second differential mode current I2 transmitted in the third trace 7013 and the sixth trace 7023 is opposite to that of the second common mode current I2a.
  • the second differential mode current I2 is transported to the current transformer 500 along the sixth wiring 7023, it is transported to the third terminal 603 along the third wiring 7013; the second common mode current I2a is transmitted from the third terminal 603 along the third wiring 7013.
  • the third wiring 7013 is sent to the current transformer 500, it is sent to the first boosting unit 401 and the second boosting unit 402 along the sixth wiring 7023.
  • the control module 100 controls the first boosting unit 401 to control the second differential mode current I2.
  • Perform boost processing The first boosting unit 401 boosts the second differential mode current I2 and then outputs the second boosted current.
  • the first boosting unit 401 is used to boost the second differential mode current I2 and then output the second boosted current.
  • the second boost current is direct current.
  • the second differential mode current I2 transmitted from the first boosting unit 401 to the current transformer 500 along the eighth wiring 7025 and the sixth wiring 7023 is not boosted.
  • the second boost current is delivered from the first boost unit 401 to the inverter module 300.
  • the control module 100 controls the inverter module 300 to perform inversion processing on the second boost current to convert the second boost current into a second alternating current output.
  • the second AC power is transmitted from the inverter module 300 to the output terminal 200 through the plurality of output wirings 7041, the second AC power is transmitted from the output terminal 200 to the AC load 2000 along the plurality of fifth cables 805 to supply the AC load 2000.
  • the third wiring 7013 and The third cable 803 flows back to the third terminal 603, and then flows back to the first negative output terminal 902 and the second negative output terminal 904 respectively.
  • the current transmitted in the sixth wiring 7023 and the third wiring 7013 includes the first difference The combined current of the mode current I1 and the second differential mode current I2 (ie, the third differential mode current I3).
  • the value of the third differential mode current I3 is equal to the sum of the value of the first differential mode current I1 and the value of the second differential mode current I2.
  • the first common mode current I1a is transmitted from the third terminal 603 to the current transformer 500 along the third wiring 7013, it is then transmitted to the first boosting unit 401 and the second boosting unit 402 along the sixth wiring 7023;
  • the second common mode current I2a is transmitted from the third connection terminal 603 to the current transformer 500 along the third trace 7013, and then is transmitted to the first boost unit 401 and the second boost unit 402 along the sixth trace 7023; the third trace
  • the current transmitted in the line 7013 and the sixth trace 7023 also includes the first common mode The combined current of the current I1a and the second common mode current I2a (ie, the third common mode current I3a).
  • the value of the third common mode current I3a is equal to the sum of the value of the first common mode current I1a and the value of the second common mode current I2a.
  • the direction of the third common mode current I3a is opposite to the direction of the third differential mode current I3.
  • the eighth voltage is generated from the first boosting unit 401 along the eighth step.
  • the above-mentioned first ripple current and second ripple current are both alternating currents.
  • the phase of the first ripple current is the first initial phase
  • the phase of the second ripple current is the second initial phase.
  • control module 100 is further configured to perform phase shifting processing on the first ripple current and the second ripple current, so that the phases of the first ripple current and the second ripple current are opposite or approximately opposite. Specifically, the control module 100 performs a first phase shifting process on the first ripple current, so that the phase of the first ripple current is converted from the first initial phase to a first phase; the control module 100 performs a first phase shifting process on the second ripple current. A second phase shift process is performed to convert the phase of the second ripple current from the second initial phase to the second phase. Wherein, the first phase is opposite or approximately opposite to the second phase.
  • the first ripple current transmitted from the eighth trace 7025 to the sixth trace 7023 along with the first differential mode current I1 is the same as the first ripple current transmitted from the seventh trace 7024 to the sixth trace 7023 along with the second differential mode current I2.
  • the second ripple currents cancel each other in the sixth trace 7023 to prevent the third differential mode current I3 transmitted in the sixth trace 7023 and the third trace 7013 from being greatly affected by the current ripple and avoid current mutual inductance.
  • ripple noise signals in the induced current output by the detector 500 thereby preventing the ripple noise signal from interfering with the arc signal detection by the detection module 100a, which is beneficial to improving the detection accuracy of the arc signal detection in the induced current by the detection module 100a.
  • the detection module 100a is located between the current transformer 500 and the inverter module 300, and is located on one side of the boost module 400. Specifically, the detection module 100a is located on the side of the second boost unit 402 facing away from the first boost unit 401. Among them, the detection module 100a is electrically connected to the current transformer 500 and the control module 100.
  • the seventh line 707 is located between the detection module 100a and the current transformer 500 and is connected to the detection module 100a and the current transformer 500.
  • the seventh line 707 is used to realize the electrical connection between the detection module 100a and the current transformer 500.
  • the seventh line 707 includes two detection traces 7071 and two self-test traces 7072.
  • the two detection traces 7071 and the two self-test traces 7072 are spaced opposite each other in sequence.
  • Each detection trace 7071 and the self-test trace One end of the trace 7072 is connected to the current transformer 500, and the other end is connected to the detection module 100a.
  • the current transformer 500 is electrically connected to the detection module 100a.
  • self-test trace 7072 may be omitted.
  • the eighth line 708 is located between the detection module 100a and the control module 100, and is connected to the detection module 100a and the control module 100.
  • the eighth line 708 is used to realize the electrical connection between the detection module 100a and the control module 100.
  • the current transformer 500 can output the first induced current I4 and the second induced current I5 according to the above current.
  • the first induced current I4 is transported to the detection module 100a along the two detection traces 7071, and the control module 100 controls the detection module 100a to perform arc detection on the first induced current I4.
  • the detection module 100a is used to perform arc detection on the first induced current I4. If the detection module 100a detects the arcing signal, the detection module 100a outputs a control signal along the eighth line 708 to the control module 100, and the control module 100 controls the photovoltaic converter 800a to stop working.
  • the second induced current I5 is delivered to the detection module 100a along the two self-test traces 7072.
  • the control module 100 can control the detection module 100a to generate a simulated arc signal, and the simulated arc signal is used for self-testing of the detection module 100a.
  • the detection module 100a is also used to generate a simulated arc signal, and the simulated arc signal is used for self-testing of the detection module 100a.
  • the detection module 100a can output the control signal to the control module. 100 to control the photovoltaic converter 800a to stop working. In this way, whether the detection module 100a can work normally can be judged by simulating the arc signal.
  • FIG. 3 is a schematic three-dimensional structural diagram of a current transformer 500 provided by an embodiment of the present application.
  • the current transformer 500 includes a fixed component 10 , a magnetic structure 20 , a first positive primary winding 30 , a second positive primary winding 40 , a negative primary winding 50 , a first secondary winding 60 and a second secondary winding 70 .
  • the magnetic structure 20 is fixedly connected to the fixing member 10 .
  • the first positive primary winding 30 passes through the magnetic structure 20 without contact.
  • the first positive primary winding 30 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the second positive primary winding 40 passes through the magnetic structure 20 without contact.
  • the second positive primary winding 40 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the negative primary winding 50 passes through the magnetic structure 20 without contact.
  • the negative primary winding 50 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the first secondary winding 60 is wound on the magnetic structure 20 .
  • the first secondary winding 60 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the second secondary winding 70 is wound on the magnetic structure 20 .
  • the second secondary winding 70 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the first positive primary winding 30 is connected to the first wiring 7011 and the fifth wiring 7022, and the first positive primary winding 30 is electrically connected to the first positive output terminal 901 and the first boost unit 401, The first positive primary winding 30 is used to transmit the first differential mode current I1 and the first common mode current I1a.
  • the first differential mode current I1 and the first common mode current I1a are transmitted from the first positive output terminal 901 through the first connection terminal. 601 and the first positive primary winding 30 are sent to the first boost unit 401.
  • the first positive primary winding 30 is electrically connected to the first positive output terminal 901 of the first photovoltaic module 900 and the boost module 400 of the power conversion circuit 100b (shown in FIG. 1 ).
  • the first positive primary winding 30 may also be electrically connected to more first positive output terminals 901 of the first photovoltaic modules 900 , such as two, three, four, etc.
  • the second positive primary winding 40 is connected to the second wiring 7012 and the fourth wiring 7021.
  • the second positive primary winding 40 is electrically connected to the second positive output terminal 903 and the second boost unit 402.
  • the positive primary winding 40 is used to transmit the second differential mode current I2 and the second common mode current I2a.
  • the second differential mode current I2 and the second common mode current I2a are transmitted from the second positive output terminal 903 through the second terminal 602 and
  • the second positive primary winding 40 is delivered to the second boost unit 402 .
  • the second positive primary winding 40 is electrically connected to the second positive output terminal 903 of the second photovoltaic module 900a and the boost module 400 of the power conversion circuit 100b.
  • the second positive primary winding 40 can also be electrically connected to the second positive output terminals 903 of more second photovoltaic modules 900a, such as two, three, four, etc.
  • the negative primary winding 50 is connected to the third wiring 7013 and the sixth wiring 7023.
  • the negative primary winding 50 is connected to the first negative output terminal 902, the second negative output terminal 904, the first boost unit 401 and the second boost unit.
  • the unit 402 is electrically connected, and the negative primary winding 50 is used to transmit the third differential mode current I3 and the third common mode current I3a.
  • the third differential mode current I3 passes through the negative voltage from the first boosting unit 401 and the second boosting unit 402.
  • the primary winding 50 is delivered to the third terminal 603; the third common mode current I3a is delivered from the third terminal 603 to the first boost unit 401 and the second boost unit 402 through the negative primary winding 50.
  • the negative primary winding 50 is electrically connected to the first negative output terminal 902 of the first photovoltaic module 900, the second negative output terminal 904 of the second photovoltaic module 900a, and the boost module 400 of the power conversion circuit 100b.
  • the first secondary winding 60 is connected to the two detection traces 7071, and is electrically connected to the detection module 100a.
  • the first secondary winding 60 is used to connect the first positive primary winding 30 and the first positive primary winding 30 according to the transmission.
  • the current coupling in the two positive primary windings 40 and the negative primary winding 50 outputs the first induced current I4, specifically based on the magnetic flux sum, the first induced current I4 is output.
  • the second secondary winding 70 is connected to the two self-test traces 7072.
  • the second secondary winding 70 is electrically connected to the detection module 100a.
  • the second secondary winding 70 is used to transmit power between the first positive primary winding 30 and the detection module 100a according to the transmission.
  • the current coupling in the second positive primary winding 40 and the negative primary winding 50 outputs the second induced current I5, specifically based on the magnetic flux sum, the second induced current I5 is output.
  • the sum of the magnetic fluxes is the first differential mode current I1, the second differential mode current I2, the third differential mode current I3, the first common mode current I1a, the second common mode current I2a and the third common mode current I1a.
  • the number of the first positive primary winding 30 is one, and the number of the second positive primary winding 40 is one.
  • the number of the first positive primary winding 30 and the second positive primary winding 40 may be more, such as two, three, four, five, etc., for example, each third A positive primary winding 30 can be electrically connected to the first positive output terminal 901 of a first photovoltaic module 900, and each second positive primary winding 40 can be electrically connected to a second positive electrode of a second photovoltaic module 900a.
  • the output terminal 903 is electrically connected.
  • the number of secondary windings is two, which are the first secondary winding 60 and the second secondary winding 70 . In some other embodiments, the number of secondary windings may be one or more, such as three, four, five, etc. The number of secondary windings is not specifically limited in this application.
  • Figure 4 is a schematic three-dimensional structural diagram of the fixing member 10 in the current transformer 500 shown in Figure 3.
  • the fixing member 10 is a rectangular plate.
  • the length direction of the fixing member 10 is defined as the first direction (the X-axis direction in the figure)
  • the width direction of the fixing member 10 is defined as the second direction (the Y-axis direction in the figure)
  • the thickness direction of the fixing member 10 is defined as the first direction (the X-axis direction in the figure).
  • the third direction Z-axis direction in the figure).
  • the fixing member 10 is made of insulating material, such as plastic, plastic, epoxy resin, etc.
  • the fixing member 10 may also be a special-shaped plate such as a circular plate or a triangular plate, which is not limited in this application.
  • the fixing member 10 is provided with a plurality of through holes. Along the Z-axis direction, each through hole penetrates through the fixing member 10 .
  • the plurality of through holes include a first through hole 11 , a second through hole 12 , a third through hole 13 , a fourth through hole 14 , a fifth through hole 15 , a sixth through hole 16 , and a seventh through hole. 17.
  • the eighth through hole 18, the ninth through hole 19 and the tenth through hole 19a are circular holes.
  • the areas of the first through hole 11 and the second through hole 12 are equal.
  • the areas of the third through hole 13 and the fourth through hole 14 are equal to those of the first through hole 11 and the second through hole 12 . In some other embodiments, they may not be equal.
  • the areas of the fifth through hole 15 and the sixth through hole 16 are equal and equal to the sum of the areas of the first through hole 11 and the third through hole 13 .
  • the seventh through hole 17 and the eighth through hole 18 have the same area.
  • the ninth through hole 19 has the same area as the tenth through hole 19 a , and is equal to the areas of the seventh through hole 17 and the eighth through hole 18 . In some other embodiments, they may not be equal. It should be noted that the above equality may also allow a certain tolerance range.
  • the first through hole 11 , the third through hole 13 and the sixth through hole 16 are arranged at intervals in sequence, and the third through hole 13 is located between the first through hole 11 and the sixth through hole 16 .
  • the second through hole 12 is spaced and offset from the first through hole 11 , and is located on one side of the sixth through hole 16 .
  • the offset arrangement of feature A and feature B means that the projections of feature A and feature B on the X-Z plane do not overlap.
  • the misalignment of feature A and feature B means that the projections of feature A and feature B on the Y-Z plane do not overlap.
  • the misalignment of feature A and feature B means that the projections of feature A and feature B on the X-Y plane do not overlap.
  • the fourth through hole 14 and the third through hole 13 are spaced and offset; and along the X-axis direction, the fourth through hole 14 is located between the third through hole 13 and the sixth through hole 16, and It is located on the side of the second through hole 12 facing the third through hole 13 and is spaced apart from the second through hole 12 .
  • the distance between the fourth through hole 14 and the third through hole 13 is equal to the distance between the second through hole 12 and the first through hole 11 . In some other embodiments, they may not be equal.
  • the fifth through hole 15 and the sixth through hole 16 are spaced and offset, and are located on one side of the first through hole 11; and along the X-axis direction, the fifth through hole 15 is located at the third through hole 13 faces the side of the first through hole 11 and is located on the side of the fourth through hole 14 facing away from the second through hole 12 and is spaced apart from the fourth through hole 14 .
  • the distance between the fifth through hole 15 and the sixth through hole 16 , the distance between the first through hole 11 and the second through hole 12 , and the distance between the third through hole 13 and the fourth through hole 14 are equal. . In some other embodiments, they may not be equal.
  • the ninth through hole 19 , the tenth through hole 19 a , the seventh through hole 17 and the eighth through hole 18 are arranged in sequence. Between the fifth through hole 15 and the fourth through hole 14 . Among them, the ninth through hole 19 is spaced apart from the fifth through hole 15, the eighth through hole 18 is located on the side of the ninth through hole 19 facing away from the fifth through hole 15, and the eighth through hole 18 is spaced apart from the fourth through hole 14. .
  • Figure 5 is a schematic three-dimensional structural diagram of the magnetic structure 20 in the current transformer 500 shown in Figure 3.
  • Figure 6 is a schematic diagram of the magnetic structure 20 and the fixing member 10 in the current transformer 500 shown in Figure 3. Schematic diagram of the structure from another angle.
  • the magnetic structure 20 is fixedly connected to the fixing member 10 .
  • the magnetic structure 20 is fixedly laminated on one surface of the fixing member 10 .
  • the magnetic structure 20 is fixedly connected to the fixing member 10 by gluing, welding, etc., which is not specifically limited in this application.
  • the magnetic structure 20 is a rectangular frame.
  • the magnetic structure 20 is made of soft magnetic materials, which include but are not limited to soft iron, soft magnetic alloys, ferrite materials, steel silicon wafers, etc., which are not specifically limited in this application.
  • the magnetic structure 20 can also be a frame of various shapes such as an annular frame or a rhombus frame.
  • the height direction of the magnetic structure 20 is parallel to the Z-axis direction
  • the length direction of the magnetic structure 20 is parallel to the X-axis direction
  • the width direction of the magnetic structure 20 is parallel to the Y-axis direction.
  • the magnetic structure 20 includes a first magnetic core 21 and a second magnetic core 22.
  • the first magnetic core 21 and the second magnetic core 22 are arranged oppositely.
  • the first magnetic core 21 and the second magnetic core 22 are surrounded to form a traveling channel 23.
  • the core 21 is spaced apart from the second magnetic core 22 and has an air gap 24 .
  • the first magnetic core 21 and the second magnetic core 22 can also be integrally formed to enhance the overall strength of the magnetic structure 20 , that is, the air gap 24 can be omitted.
  • the first magnetic core 21 and the second magnetic core 22 of this embodiment have a substantially U-shaped block structure.
  • the magnetic structure 20 has a through channel 23 , and the through channel 23 extends along the thickness direction of the magnetic structure 20 .
  • the magnetic structure 20 is provided with air gaps 24 , the number of the air gaps 24 is two (the first air gap 241 and the second air gap 242 respectively), and the air gaps 24 are connected to the through passage 23 .
  • the design of the air gap 24 effectively reduces the magnetic permeability of the magnetic structure 20, effectively increases the saturation magnetization intensity of the magnetic structure 20, avoids magnetic saturation of the magnetic structure 20 during operation, and has a simple structure and is easy to design.
  • the first magnetic core 21 includes a first magnet 211, a second magnet 212 and a third magnet 213.
  • the first magnet 211 and the second magnet 212 are arranged in parallel and opposite to each other, and the first magnet 211 and the second magnet 212 are both They are located on one side of the third magnet 213 and are connected to the third magnet 213 .
  • the third magnet 213 is arranged perpendicularly to both the first magnet 211 and the second magnet 212 .
  • One end of the third magnet 213 is connected to one end of the first magnet 211 , and the other end is connected to one end of the second magnet 212 .
  • the first magnetic core 21 thus arranged has a stable structure and high strength.
  • the vertical arrangement of feature A and feature B means that the geometric center line of feature A is perpendicular to the geometric center line of feature B (a certain tolerance range may also be allowed).
  • the following description of the vertical arrangement can refer to the above. ,No longer.
  • the parallel and relative arrangement of feature A and feature B means that the geometric centerline of feature A is parallel to the geometric centerline of feature B (a certain tolerance range may also be allowed), and feature A and feature B are spaced apart.
  • the parallel and relative arrangement will be discussed later. The description of can refer to the above and will not be repeated again.
  • the second magnetic core 22 includes a fourth magnet 221 , a fifth magnet 222 and a sixth magnet 223 .
  • the fourth magnet 221 and the fifth magnet 222 are arranged parallel to each other, and both the fourth magnet 221 and the fifth magnet 222 are located on one side of the sixth magnet 223 and connected to the sixth magnet 223 .
  • the sixth magnet 223 is arranged perpendicularly to the fourth magnet 221 and the fifth magnet 222 .
  • One end of the sixth magnet 223 is connected to one end of the fourth magnet 221 , and the other end is connected to one end of the fifth magnet 222 .
  • the second magnetic core 22 thus arranged has a stable structure and high strength.
  • the first magnetic core 21 is fixedly stacked on the fixing member 10 .
  • the second magnet 212 is fixedly stacked on one surface of the fixing member 10
  • the length direction of the second magnet 212 and the length direction of the first magnet 211 are parallel to the X-axis direction
  • the length direction of the third magnet 213 is parallel to the Z-axis. direction.
  • the first through hole 11 and the third through hole 13 are located on one side of the second magnet 212
  • the seventh through hole 17 is located on the other side of the second magnet 212.
  • the eighth through hole 18 is located at an end of the second magnet 212 facing away from the third magnet 213 .
  • the second magnetic core 22 is fixedly stacked on the fixing member 10 and is spaced opposite to the first magnetic core 21 .
  • the fifth magnet 222 is fixedly stacked on one surface of the fixing member 10 and is spaced opposite to the second magnet 212 .
  • the length of the fifth magnet 222 The direction and the length direction of the fourth magnet 221 are parallel to the X-axis direction, and the length direction of the sixth magnet 223 is parallel to the Z-axis direction. Among them, along the Y-axis direction, the sixth through hole 16 is located on one side of the fifth magnet 222 , and the eighth through hole 18 , the fourth through hole 14 and the second through hole 12 are located on the other side of the fifth magnet 222 .
  • the second magnet 212 is located at an end of the fifth magnet 222 facing away from the sixth magnet 223, and is spaced apart from the second magnet 212 and has the second air gap 242.
  • the fourth magnet 221 is spaced apart from the first magnet 211 and has the first air gap 241 .
  • the second magnetic core 22 and the first magnetic core 21 surround each other to form the through channel 23, and the through channel 23 extends along the Y-axis direction.
  • the length of the first air gap 241 is equal to the length of the second air gap 242 .
  • the length of the first air gap 241 and the length of the second air gap 242 may also be unequal. It should be noted that if feature A and feature B are spaced apart and have an air gap, the length of the air gap refers to the distance between feature A and feature B.
  • the lengths of the first air gap 241 and the second air gap 242 can be changed, thereby changing the magnetic permeability of the magnetic structure 20. and saturation magnetization, so that the magnetic permeability and saturation magnetization of the magnetic structure 20 can be adjusted as needed to avoid magnetic saturation of the magnetic structure 20 during operation.
  • the greater the length of the first air gap 241 and the length of the second air gap 242 that is, the greater the distance between the first magnetic core 21 and the second magnetic core 22 in the X-axis direction, the greater the magnetic permeability of the magnetic structure 20 The smaller the ratio, the greater the saturation magnetization, and the less likely magnetic saturation will occur.
  • the number of air gaps 24 may also be one or more, such as three, four, five, etc., and the air gaps 24 may be disposed at any position of the magnetic structure 20 , that is, the present application applies The number and position of the air gaps 24 are not specifically limited.
  • FIG. 7 is a schematic three-dimensional structural diagram of the first positive primary winding 30 in the current transformer 500 shown in FIG. 3 .
  • the first positive primary winding 30 passes through the magnetic structure 20 .
  • the first positive primary winding 30 is installed in the fixing member 10 .
  • the first positive primary winding 30 passes through the through channel 23 .
  • the two ends of the first positive primary winding 30 are inserted into the first through hole 11 and the second through hole 12 respectively.
  • one end of the first positive primary winding 30 is located on one side of the magnetic structure 20 , and the other end is located on the other side of the magnetic structure 20 .
  • the first positive primary winding 30 is a metal strip, specifically a copper strip.
  • the first positive primary winding 30 can also be made of aluminum, silver or other conductive metals or other materials, which is not specifically limited in this application.
  • the first positive primary winding 30 includes a first connection part 31 , a second connection part 32 and a third connection part 33 .
  • the second connecting portion 32 and the third connecting portion 33 are arranged in parallel and opposite to each other and are located on opposite sides of the first connecting portion 31 .
  • the second connecting portion 32 and the third connecting portion 33 are respectively connected to opposite ends of the first connecting portion 31 . . That is to say, along the extending direction of the first connecting part 31 , the second connecting part 32 and the third connecting part 33 are disposed in a staggered position.
  • the staggered arrangement of feature A and feature B in a certain direction refers to the projection of feature A on a plane perpendicular to the direction and the projection of feature B on a plane perpendicular to the direction. No overlap.
  • the second connecting part 32 includes a first part 321 and a second part 322.
  • the first part 321 includes a first end part 3211.
  • the end of the first part 321 facing away from the first end part 3211 is connected to one end of the second part 322.
  • the first part 321 and the second part 322 are arranged vertically.
  • the end of the second part 322 facing away from the first part 321 is connected to one end of the first connecting part 31
  • the first connecting part 31 is arranged perpendicularly to the first part 321 and the second part 322 .
  • the end of the second connecting part 32 facing away from the first connecting part 31 is the first end 3211 .
  • the cross-sectional shape of the first end 3211 is a rectangle, and the cross-sectional area of the first end 3211 is equal to the area of the first through hole 11 . A certain tolerance range is allowed for said equality.
  • the third connecting part 33 includes a third part 331 and a fourth part 332.
  • the third part 331 includes a second end part 3311.
  • the end of the third part 331 facing away from the second end part 3311 is connected to one end of the fourth part 332.
  • the third part 331 and the fourth part 332 are arranged vertically.
  • the third part 331 and the fourth part 332 are both located on the side of the first connecting part 31 facing away from the second part 322.
  • the end of 332 facing away from the third part 331 is connected to the other end of the first connecting part 31 , and the first connecting part 31 is arranged vertically to the third part 331 and the fourth part 332 . It can be understood that the end of the third connecting part 33 facing away from the first connecting part 31 is the second end 3311 .
  • the cross-sectional shape of the second end 3311 is a rectangle, and the cross-sectional area of the second end 3311 is equal to the cross-sectional area of the first end 3211 (a certain tolerance range may also be allowed). In some other embodiments, they may not be equal.
  • the cross-sectional area of the second end 3311 is equal to the area of the second through hole 12 . It should be noted that the cross-sectional area of feature A refers to the projected area of feature A on the X-Y plane. The following description of the cross-sectional area may refer to the above and will not be described again.
  • the first connecting part 31 passes through the magnetic structure 20 , the second connecting part 32 is located on one side of the magnetic structure 20 and is inserted into the fixing part 10 , and the third connecting part 33 is located on the other side of the magnetic structure 20 and is inserted into the fixing part 10 .
  • the second connecting portion 32 and the third connecting portion 33 are located on opposite sides of the magnetic structure 20 .
  • the first connecting portion 31 passes through the through passage 23 , and the length direction of the first connecting portion 31 is parallel to the Y-axis direction. In other words, the first connecting portion 31 extends along the extending direction of the passage channel 23 .
  • the first part 321 and the second part 322 are located on one side of the magnetic structure 20 , and the length direction of the second part 322 is parallel to the X-axis direction.
  • the length direction of the first part 321 is parallel to the Z-axis direction.
  • the first part 321 is inserted into the first through hole 11 of the fixing part 10 by gluing, welding or interference fit.
  • the first end part 3211 is located on the fixing part. 10 is the side facing away from the magnetic structure 20 . It can be understood that the second connecting portion 32 extends along the height direction of the magnetic structure 20 .
  • the third part 331 and the fourth part 332 are located on the other side of the magnetic structure 20 , and the length direction of the fourth part 332 is parallel to the X-axis direction.
  • the length direction of the third part 331 is parallel to the Z-axis direction.
  • the third part 331 is inserted into the second through hole 12 of the fixing part 10 by gluing, welding or interference fitting.
  • the second end part 3311 is located on the fixing part. 10 is the side facing away from the magnetic structure 20 . It can be understood that the third connecting portion 33 extends along the height direction of the magnetic structure 20 .
  • the first end 3211 and the second end 3311 are located at opposite ends of the first connecting part 31 .
  • the first positive primary winding 30 includes a first end 3211 and a second end 3311.
  • the first positive primary winding 30 passes through the passage 23 and is installed in the fixing member 10.
  • the first end The first end 3211 and the second end 3311 are located on opposite sides of the magnetic structure 20 , and both are located on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • FIG. 8 is a partial structural diagram of the current transformer 500 shown in FIG. 3 and the circuit board 700 after being cut along line A-A.
  • the first positive primary winding 30 is connected to the circuit board 700 .
  • the first end 3211 of the first positive primary winding 30 is connected to the first wiring 7011
  • the second end 3311 is connected to the fifth wiring 7022.
  • the first end 3211 and the second end 3311 are connected to the first wiring 7011 and the fifth wiring 7022 respectively by means including but not limited to welding.
  • the circuit board 700 is provided with a first plug hole (not shown) and a second plug hole at the ends of the first trace 7011 and the fifth trace 7022.
  • the hole wall of each plug hole is plated. There is a metal layer, and the first end 3211 and the second end 3311 are inserted into and welded into the first plug hole and the second plug hole respectively.
  • the first end 3211 is electrically connected and fixedly connected to the first wiring 7011
  • the second end 3311 is electrically connected and fixedly connected to the fifth wiring 7022.
  • the circuit board 700 is fixedly and electrically connected to the first end 3211 and the second end 3311 .
  • the first end 3211 is electrically connected to the first positive output terminal 901 of the first photovoltaic module 900
  • the second end 3311 is electrically connected to the first boost unit 401, that is, to the boost module 400 and the inverter.
  • the module 300 is electrically connected, that is, electrically connected to the power conversion circuit 100b (shown in FIG. 1 ).
  • the first differential mode current I1 is transported from the first end 3211 to the first positive primary winding 30 through the first trace 7011; then, it passes through the magnetic structure along the first connection portion 31 of the first positive primary winding 30. 20 passes through the channel 23, is transported from the second end 3311 to the fifth wiring 7022, and is then transported to the first boost unit 401 along the fifth wiring 7022.
  • the first common mode current I1a is transported from the first end 3211 to the first positive primary winding 30 through the first wiring 7011; Then, after passing through the through passage 23 of the magnetic structure 20 along the first connection portion 31 of the first positive primary winding 30, it is transported from the second end portion 3311 to the fifth wiring 7022.
  • the first positive primary winding 30 is used to transmit the first differential mode current I1 and the first common mode current I1a, and the first differential mode current I1 and the first common mode current I1a both flow from the first end 3211 to the first common mode current I1a.
  • the two end portions 3311 transmit in the same direction in the first connecting portion 31 .
  • FIG. 9 is a schematic three-dimensional structural diagram of the second positive primary winding 40 in the current transformer 500 shown in FIG. 3 .
  • the second positive primary winding 40 passes through the magnetic structure 20 .
  • the second positive primary winding 40 is installed in the fixing member 10 and is spaced apart from the first positive primary winding 30 .
  • the second positive primary winding 40 passes through the passage 23 and is spaced apart from the first positive primary winding 30 , and the two ends of the second positive primary winding 40 are respectively installed in the third pass. hole 13 and the fourth through hole 14.
  • One end of the second positive primary winding 40 is located on the side of the magnetic structure 20 facing the first end 3211 and spaced apart from the first end 3211 , and the other end is located on the side of the magnetic structure 20 facing the second end 3311 . spaced apart from the second end 3311.
  • the second positive primary winding 40 is partially covered by the first positive primary winding 30 .
  • the second positive primary winding 40 is a metal strip, specifically a copper strip.
  • the second positive primary winding 40 can also be made of aluminum, silver or other conductive metals or other materials, which is not specifically limited in this application.
  • feature A being covered by feature B means that the projections of feature A and feature B on the X-Z plane at least partially overlap.
  • the following description of covering can refer to the above and will not be described again.
  • the second positive primary winding 40 may not be covered by the first positive primary winding 30, or the second positive primary winding 40 may cover the first positive primary winding 30, or However, the second positive primary winding 40 has no covering relationship with the first positive primary winding 30 .
  • the second positive primary winding 40 includes a first fixing part 41 , a second fixing part 42 and a third fixing part 43 .
  • the second fixing part 42 and the third fixing part 43 are arranged in parallel and opposite to each other and are located on opposite sides of the first fixing part 41.
  • the second fixing part 42 and the third fixing part 43 are respectively connected to the opposite ends of the first fixing part 41. . That is to say, along the extending direction of the first fixing part 41, the second fixing part 42 and the third fixing part 43 are disposed in a staggered position.
  • the second fixing part 42 includes a first part 421 and a second part 422.
  • the first part 421 includes a third end part 4211.
  • the end of the first part 421 facing away from the third end part 4211 and the second part One end of 422 is connected, and the first sub-part 421 and the second sub-part 422 are arranged vertically.
  • the end of the second branch 422 facing away from the first branch 421 is connected to one end of the first fixing part 41 .
  • the first fixing part 41 is vertically arranged with the first branch 421 and the second branch 422 . It can be understood that the end of the second fixing part 42 facing away from the first fixing part 41 is the third end 4211.
  • the cross-sectional shape of the third end 4211 is a rectangle, and the cross-sectional area of the third end 4211 is equal to the area of the third through hole 13 . A certain tolerance range is allowed for said equality.
  • the third fixing part 43 includes a third part 431 and a fourth part 432.
  • the third part 431 includes a fourth end part 4311.
  • the end part of the third part 431 facing away from the fourth end part 4311 and the fourth part One end of 432 is connected, and the third part 431 and the fourth part 432 are arranged vertically.
  • the third sub-part 431 and the fourth sub-part 432 are both located on the side of the first fixed part 41 facing away from the second sub-part 422, and the end of the fourth sub-part 432 facing away from the third sub-part 431 is in contact with the first fixed part 431.
  • the other end of the first fixing part 41 is connected to the first fixing part 41 and the third sub-part 431 and the fourth sub-part 432 are arranged vertically. It can be understood that the end of the third fixing part 43 facing away from the first fixing part 41 is the fourth end 4311.
  • the cross-sectional shape of the fourth end 4311 is a rectangle, and the cross-sectional area of the fourth end 4311 is equal to the cross-sectional area of the third end 4211 (a certain tolerance range may also be allowed). In some other embodiments, they may not be equal.
  • the cross-sectional area of the fourth end 4311 is equal to the area of the fourth through hole 14 .
  • the first fixing part 41 passes through the magnetic structure 20 and is spaced apart from the first connecting part 31.
  • the second fixing part 42 is located on the side of the magnetic structure 20 facing the second connecting part 32 and is spaced apart from the second connecting part 32. and is worn in the fixing member 10,
  • the third fixing part 43 is located on the side of the magnetic structure 20 facing the third connecting part 33 , is spaced apart from the third connecting part 33 , and is inserted into the fixing part 10 .
  • the first fixing part 41 passes through the passage channel 23 , and the length direction of the first fixing part 41 is parallel to the Y-axis direction. In other words, the first fixing part 41 extends along the extending direction of the passage channel 23 .
  • the first fixing part 41 is spaced apart from the first connecting part 31 , and along the Z-axis direction, the projection of the first fixing part 41 overlaps with the projection of the first connecting part 31 .
  • the first branch part 421 and the second branch part 422 are both located on the side of the magnetic structure 20 facing the second connecting part 32 .
  • the length direction of the second branch part 422 is parallel to the X-axis direction, and along the Z-axis direction, the second branch part 422 is parallel to the X-axis direction.
  • the portion 422 is located on one side of the second portion 322 and is spaced apart from the second portion 322 (as shown in FIG. 7 ).
  • the length direction of the first portion 421 is parallel to the Z-axis direction, and along the X-axis direction, the first portion 421 is located on one side of the first portion 321 and spaced apart from the first portion 321 .
  • the first part 421 is inserted into the third through hole 13 of the fixing member 10 through gluing, welding or interference fit.
  • the third end 4211 is located on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • the third end 4211 is located on one side of the first end 3211 and spaced apart from the first end 3211 .
  • the second fixing portion 42 extends along the height direction of the magnetic structure 20 .
  • the third end 4211 is located at an end of the first fixing part 41 facing the first end 3211 .
  • the third branch 431 and the fourth branch 432 are located on the side of the magnetic structure 20 facing the third connecting part 33 .
  • the length direction of the fourth branch 432 is parallel to the X-axis direction, and along the Z-axis direction, the fourth branch 432 is located on one side of the fourth portion 332 and spaced apart from the fourth portion 332 .
  • the length direction of the third part 431 is parallel to the Z-axis direction, and along the X-axis direction, the third part 431 is located on one side of the third part 331 and spaced apart from the third part 331 .
  • the third part 431 is inserted into the fourth through hole 14 of the fixing member 10 through gluing, welding or interference fit.
  • the fourth end 4311 is located on the side of the fixing member 10 facing away from the magnetic structure 20 . And the fourth end 4311 is located on one side of the second end 3311 and spaced apart from the second end 3311 . It can be understood that the third fixing portion 43 extends along the height direction of the magnetic structure 20 . Along the extending direction of the passage channel 23 , the fourth end 4311 is located at the other end of the first fixing part 41 facing the second end 3311 . Along the Y-axis direction (that is, in the extending direction of the through passage 23 ), the distance between the third end 4211 and the fourth end 4311 and the distance between the first end 3211 and the second end 3311 are equal.
  • the second positive primary winding 40 includes a third end 4211 and a fourth end 4311.
  • the second positive primary winding 40 passes through the passage 23 and is spaced apart from the first positive primary winding 30. And installed in the fixing member 10.
  • the third end 4211 is located on the side of the magnetic structure 20 facing the first end 3211
  • the fourth end 4311 is located on the side of the magnetic structure 20 facing the second end 3311 .
  • the first end 3211 , the second end 3311 , the third end 4211 and the fourth end 4311 are all located on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • the second positive primary winding 40 is connected to the circuit board 700.
  • the third end 4211 of the second positive primary winding 40 is connected to the second trace 7012
  • the fourth end 4311 is connected to the fourth trace 7021.
  • the third end 4211 and the fourth end 4311 are respectively connected to the second wiring 7012 and the fourth wiring 7021 by means including but not limited to welding.
  • the circuit board 700 is provided with a third plug hole (not shown) and a fourth plug hole at the ends of the second trace 7012 and the fourth trace 7021.
  • the hole wall of each plug hole is plated. There is a metal layer, and the third end 4211 and the fourth end 4311 are inserted and welded into the third plug hole and the fourth plug hole respectively.
  • the third end 4211 is electrically connected and fixedly connected to the second wiring 7012
  • the fourth end 4311 is electrically connected and fixedly connected to the fourth wiring 7021.
  • the circuit board 700 is fixedly and electrically connected to the third end 4211 and the fourth end 4311 .
  • the third end 4211 is electrically connected to the second positive output terminal 903 of the second photovoltaic module 900a
  • the fourth end 4311 is electrically connected to the second boost unit 402, that is, to the boost module 400 and the inverter.
  • the module 300 is electrically connected, that is, electrically connected to the power conversion circuit 100b (shown in FIG. 1 ).
  • the second differential mode current I2 is transported from the third end 4211 to the second positive primary winding 40 through the second trace 7012; then, it passes through the magnetic structure along the first fixed part 41 of the second positive primary winding 40. 20 passes through the channel 23, is transported from the fourth end 4311 to the fourth wiring 7021, and then is transported along the fourth wiring 7021 to the second boost unit 402.
  • the second common mode current I2a is transported from the third end 4211 to the second positive primary winding 40 through the second wiring 7012; then, it passes along the first fixed part 41 of the second positive primary winding 40. After the magnetic structure 20 passes through the channel 23, it is transported from the fourth end 4311 to the fourth wiring 7021.
  • the second positive primary winding 40 is used to transmit the second differential mode current I2 and the second common mode current I2a, and the second differential mode current I2 and the second common mode current I2a both flow from the third end 4211 to the third end.
  • the four end portions 4311 are transmitted in the same direction in the first fixing portion 41 .
  • Figure 10 is a schematic three-dimensional structural diagram of the negative primary winding 50 in the current transformer 500 shown in Figure 3.
  • Negatively charged primary winding 50 passes through magnetic structure 20 .
  • the negative primary winding 50 is installed in the fixing member 10 and is spaced apart from the first positive primary winding 30 and the second positive primary winding 40 .
  • the negative primary winding 50 passes through the through channel 23 and is spaced apart from the first positive primary winding 30 and the second positive primary winding 40 .
  • the two ends of the negative primary winding 50 are inserted into the fifth through hole 15 and the sixth through hole 16 respectively.
  • One end of the negative primary winding 50 is located on the side of the magnetic structure 20 facing the first end 3211 and the third end 4211, and is spaced apart from the first end 3211 and the third end 4211; the other end is located on the magnetic structure 20 The side facing the second end 3311 and the fourth end 4311 and spaced apart from the second end 3311 and the fourth end 4311 .
  • the negative primary winding 50 is located between the first positive primary winding 30 and the second positive primary winding 40 .
  • the negative primary winding 50 partially covers the second positive primary winding 40 and is partially covered by the first positive primary winding 30 .
  • the negative primary winding 50 is a metal strip, specifically a copper strip.
  • the negative primary winding 50 can also be made of aluminum, silver or other conductive metals or other materials, which is not specifically limited in this application.
  • the negative primary winding 50 is located on the side of the first positive primary winding 30 away from the second positive primary winding 40 , or the negative primary winding 50 is located on the second side of the first positive primary winding 30 .
  • the positive primary winding 40 is on a side away from the first positive primary winding 30 .
  • the negative primary winding 50 includes a first conductive part 51 , a second conductive part 52 and a third conductive part 53 .
  • the second conductive part 52 and the third conductive part 53 are arranged in parallel and opposite to each other, and are located on opposite sides of the first conductive part 51 .
  • the second conductive part 52 and the third conductive part 53 are respectively connected to the opposite ends of the first conductive part 51 connect.
  • the second conductive part 52 includes a first branch part 521 and a second branch part 522.
  • the first branch part 521 includes a fifth end part 5211.
  • the end of the first branch part 521 facing away from the fifth end part 5211 is connected to one end of the second branch part 522.
  • the first branch 521 and the second branch 522 are arranged vertically.
  • the end of the second branch 522 facing away from the first branch 521 is connected to one end of the first conductive part 51
  • the first conductive part 51 is arranged vertically with the first branch 521 and the second branch 522 .
  • the end of the second conductive part 52 facing away from the first conductive part 51 is the fifth end 5211 .
  • the cross-sectional shape of the fifth end portion 5211 is a rectangle, and the cross-sectional area of the fifth end portion 5211 is equal to the area of the fifth through hole 15 . A certain tolerance range is allowed for said equality.
  • the third conductive part 53 includes a third branch part 531 and a fourth branch part 532.
  • the third branch part 531 includes a sixth end part 5311.
  • the end of the third branch part 531 facing away from the sixth end part 5311 is connected to one end of the fourth branch part 532.
  • the third branch 531 and the fourth branch 532 are arranged vertically.
  • the third branch part 531 and the fourth branch part 532 are both located on the side of the first conductive part 51 facing away from the second branch part 522 , and the end of the fourth branch part 532 facing away from the third branch part 531 and the other end of the first conductive part 51
  • the first conductive part 51 is vertically connected to the third branch part 531 and the fourth branch part 532 . It can be understood that the end of the third conductive part 53 facing away from the first conductive part 51 is the sixth end 5311 .
  • the first conductive part 51 passes through the magnetic structure 20 and is spaced apart from the first connecting part 31 and the first fixing part 41 .
  • the second conductive part 52 is located on a side of the magnetic structure 20 facing the third connecting part 33 and the third fixing part 43 . side, and is spaced apart from the third connecting part 33 and the third fixing part 43 , and is inserted into the fixing part 10 .
  • the third conductive part 53 is located on the side of the magnetic structure 20 facing the second connecting part 32 and the second fixing part 42 , is spaced apart from the second connecting part 32 and the second fixing part 42 , and is installed in the fixing part 10 .
  • the first conductive part 51 passes through the through channel 23, and the length direction of the first conductive part 51 is flat. Line in the Y-axis direction.
  • the first conductive portion 51 extends along the extending direction of the through passage 23 .
  • the first conductive part 51 is located at the first connecting part 31 and the first fixing part 41 and is spaced apart from the first connecting part 31 and the first fixing part 41 . That is to say, the first connecting part 31 , the first fixing part 41 and the first conductive part 51 all pass through the passage 23 and are arranged at intervals, and the first conductive part 51 is located between the first connecting part 31 and the first fixing part 41 between.
  • the projection of the first conductive part 51 , the projection of the first connecting part 31 , and the projection of the first fixing part 41 overlap.
  • the projection of the negative primary winding 50, the projection of the first positive primary winding 30 and the second positive primary winding 50 are The primary windings 40 all overlap. In this way, it is beneficial to improve the space utilization of the first positive primary winding 30 , the second positive primary winding 40 and the negative primary winding 50 in the traveling channel 23 , and is beneficial to reducing the floor area of the current transformer 500 , which facilitates the miniaturization design of the current transformer 500.
  • the first branch part 521 and the second branch part 522 are both located on the side of the magnetic structure 20 facing the third connecting part 33 and the third fixing part 43.
  • the length direction of the second branch part 522 is parallel to the X-axis direction and along the Z-axis direction.
  • the second branch part 522 is located between the fourth part 332 (shown in FIG. 7 ) and the fourth branch part 432 (shown in FIG. 9 ), and is spaced apart from the fourth part 332 and the fourth branch part 432 .
  • the length direction of the first branch part 521 is parallel to the Z-axis direction, and along the X-axis direction, the first branch part 521 is located on the side of the third sub-part 431 facing away from the third part 331 and is spaced apart from the third sub-part 431 .
  • the first branch 521 is inserted into the fifth through hole 15 of the fixing member 10 through gluing, welding or interference fit.
  • the fifth end 5211 is located on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • the fifth end 5211 is located on the side of the fourth end 4311 facing away from the second end 3311 and is spaced apart from the fourth end 4311 .
  • the second conductive portion 52 extends along the height direction of the magnetic structure 20 .
  • the fifth end 5211 is located at an end of the first conductive part 51 facing the second end 3311 and the fourth end 4311 .
  • the third branch part 531 and the fourth branch part 532 are both located on the side of the magnetic structure 20 facing the second connecting part 32 and the second fixing part 42.
  • the length direction of the fourth branch part 532 is parallel to the X-axis direction and along the Z-axis direction.
  • the fourth branch part 532 is located between the second part 322 and the second sub-part 422 and is spaced apart from the second part 322 and the second sub-part 422 .
  • the length direction of the third branch part 531 is parallel to the Z-axis direction, and along the X-axis direction, the third branch part 531 is located on the side of the first sub-part 421 facing away from the first part 321 and is spaced apart from the first sub-part 421 .
  • the third branch part 531 is inserted into the sixth through hole 16 of the fixing member 10 by gluing, welding or interference fitting.
  • the sixth end 5311 is located on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • the sixth end 5311 is located on the side of the third end 4211 facing away from the first end 3211 and is spaced apart from the third end 4211 .
  • the third conductive portion 53 extends along the height direction of the magnetic structure 20 .
  • the sixth end 5311 is located at the other end of the first conductive part 51 facing the first end 3211 and the third end 4211 .
  • the distance between the third end 4211 and the fourth end 4311, the distance between the first end 3211 and the second end 3311, and the distance between the fifth end is equal. In this way, it is beneficial to reduce the size of the current transformer 500 in the extending direction of the through passage 23 , to reduce the floor area of the current transformer 500 , and to facilitate the miniaturization design of the current transformer 500 .
  • the negative primary winding 50 passes through the passage 23 , is spaced apart from the first positive primary winding 30 and the second positive primary winding 40 , and is installed in the fixing member 10 .
  • the fifth end 5211 is located on the side of the magnetic structure 20 facing the fourth end 4311
  • the sixth end 5311 is located on the side of the magnetic structure 20 facing the third end 4211 . That is to say, the first end 3211 , the third end 4211 and the sixth end 5311 are located on one side of the magnetic structure 20
  • the fifth end 5211 , the fourth end 4311 and the second end 3311 are located on one side of the magnetic structure 20 the other side.
  • the first positive primary winding 30, the second positive primary winding 40 and the negative primary winding 50 are installed on the fixed In the component 10 , the first end 3211 , the second end 3311 , the third end 4211 , the fourth end 4311 , the fifth end 5211 and the sixth end 5311 are all located on the side of the fixing component 10 facing away from the magnetic structure 20 one side.
  • the magnetic structure 20, the first positive primary winding 30, the second positive primary winding 40 and the negative primary winding 50 are assembled together through the fixing member 10.
  • the structure is simple and stable, which is beneficial to improving the performance of the current transformer 500. Overall structural stability.
  • first end 3211 , the second end 3311 , the third end 4211 , the fourth end 4311 , the fifth end 5211 and the sixth end 5311 are located on the side of the fixing member 10 facing away from the magnetic structure 20
  • the design facilitates the installation of the current transformer 500 and the circuit board 700 and reduces the difficulty of assembly.
  • the negative primary winding 50 is connected to the circuit board 700.
  • the fifth end 5211 of the negative primary winding 50 is connected to the third wiring 7013
  • the sixth end 5311 is connected to the sixth wiring 7023.
  • the fifth end portion 5211 and the sixth end portion 5311 are respectively connected to the third trace 7013 and the sixth trace 7023 by means including but not limited to welding.
  • the circuit board 700 is provided with a fifth plug hole (not shown) and a sixth plug hole at the ends of the third trace 7013 and the sixth trace 7023.
  • the hole wall of each plug hole is plated. There is a metal layer, and the fifth end 5211 and the sixth end 5311 are inserted and welded into the fifth plug hole and the sixth plug hole respectively.
  • the fifth end portion 5211 is electrically connected and fixedly connected to the third wiring 7013
  • the sixth end portion 5311 is electrically connected and fixedly connected to the sixth wiring 7023.
  • the circuit board 700 is fixedly and electrically connected to the fifth end 5211 and the sixth end 5311 .
  • the fifth end portion 5211 is electrically connected to the first negative output terminal 902 of the first photovoltaic module 900 and the second negative output terminal 904 of the second photovoltaic module 900a
  • the sixth end portion 5311 is electrically connected to the first boost unit 401 It is electrically connected to the second boost unit 402, that is, the sixth end 5311 is electrically connected to the boost module 400 and the inverter module 300, that is, it is electrically connected to the power conversion circuit 100b (as shown in FIG. 1).
  • the third differential mode current I3 (that is, the combined current of the first differential mode current I1 and the second differential mode current I2) is transmitted from the sixth end 5311 to the negative primary winding 50 through the sixth wiring 7023; then, along After the first conductive portion 51 of the negative primary winding 50 passes through the passage 23 of the magnetic structure 20, it is transported from the fifth end portion 5211 to the third trace 7013.
  • the third common mode current I3a (the combined current of the first common mode current I1a and the second common mode current I2a) is transported from the fifth end 5211 to the negative primary winding 50 through the third wiring 7013; then, along After the first conductive portion 51 of the negative primary winding 50 passes through the passage 23 of the magnetic structure 20, it is transported from the sixth end portion 5311 to the sixth trace 7023.
  • the negative primary winding 50 is used to transmit the third differential mode current I3 and the third common mode current I3a, and the third differential mode current I3 flows from the sixth end 5311 to the fifth end 5211.
  • the third common mode current I3a flows from the fifth end 5211 to the sixth end 5311. The two are transmitted in opposite directions in the first conductive part 51 .
  • the first end 3211 and the second end 3311 are both located on the side of the fifth end 5211 close to the sixth end 5311, and the third end 4211 and the fourth end 4311 are both located at the sixth end. part 5311 is close to the side of the fifth end part 5211.
  • the third end 4211 and the fourth end 4311 are both located between the fifth end 5211 and the sixth end 5311, and the first end 3211 is located between the third
  • the end 4211 is on the side facing away from the sixth end 5311
  • the second end 3311 is located on the side of the fourth end 4311 facing away from the fifth end 5211 .
  • the circuit board 700 wired according to the current transformer 500 designed in this way can avoid the intersection of multiple wires connected to the ends of each winding, avoid the problem of difficult wiring on the board, and facilitate the circuit design.
  • the wiring is provided on the board 700, which reduces wiring difficulties and reduces wiring design costs; moreover, while avoiding wiring crossing, the space utilization of the current transformer 500 is improved, which is beneficial to reducing the occupation of the current transformer 500.
  • the board area is beneficial to the miniaturization design of the current transformer 500.
  • Figure 11 is a schematic three-dimensional structural diagram of the current transformer 500 shown in Figure 3 (omitting the fixing member 10, the first secondary winding 60 and the second secondary winding 70).
  • Figure 12 is a schematic diagram of the current transformer 500 shown in Figure 11 It is a schematic diagram showing the direction in which the magnetic structure 20 of the current transformer 500 is passed through by the first differential mode current I1, the second differential mode current I2, and the third differential mode current I3 to generate magnetic flux.
  • Magnetic flux is a scalar quantity.
  • the positive and negative directions of the magnetic flux are related to the direction of the magnetic field passing through the cross section of the magnetic structure 20, where, The direction of the magnetic field is the forward direction of the magnetic flux.
  • the first differential mode current I1 passes through the passage 23 of the magnetic structure 20 along the first connection portion 31 of the first positive primary winding 30.
  • the first differential mode current I1 generates the first magnetic field B1.
  • the direction of the magnetic field of the first magnetic field B1 is clockwise.
  • the first magnetic field B1 passes through the cross section of the fourth magnet 221, the first magnetic field B1 is in the direction of the magnetic field of the fourth magnet 221 to the right, and the first differential mode current I1 generates magnetic flux in the fourth magnet 221 of the magnetic structure 20. (That is, the positive direction of the first magnetic flux ⁇ 1) is to the right.
  • the second differential mode current I2 passes through the passage 23 of the magnetic structure 20 along the first fixed portion 41 of the second positive primary winding 40.
  • the second differential mode current I2 generates a second magnetic field B2.
  • the direction of the second magnetic field B2 is Clockwise direction.
  • the second magnetic field B2 passes through the cross section of the fourth magnet 221, the second magnetic field B2 is directed to the right in the direction of the magnetic field of the fourth magnet 221, and the second differential mode current I2 generates magnetic flux in the fourth magnet 221 of the magnetic structure 20. (That is, the positive direction of the second magnetic flux ⁇ 2) is to the right.
  • the second magnetic flux ⁇ 2 is equal to the first magnetic flux ⁇ 1.
  • the third differential mode current I3 passes through the traveling channel 23 of the magnetic structure 20 along the first conductive portion 51 of the negative primary winding 50, and the third differential mode current I3 generates a third magnetic field B3.
  • the direction of the third magnetic field B3 is clockwise.
  • the third magnetic field B3 passes through the cross section of the fourth magnet 221, the third magnetic field B3 is directed to the right in the direction of the magnetic field of the fourth magnet 221, and the third differential mode current I3 generates magnetic flux in the fourth magnet 221 of the magnetic structure 20. (That is, the positive direction of the third magnetic flux ⁇ 3) is to the right.
  • the third magnetic flux ⁇ 3 is equal to the first magnetic flux ⁇ 1 and the second magnetic flux The sum of ⁇ 2 is equal.
  • the first differential mode The magnetic flux generated by the current I1, the second differential mode current I2, and the third differential mode current I3 in the fourth magnet 221 of the magnetic structure 20 is 6 ⁇ 1, 6 ⁇ 2, and 2 ⁇ 3. It can be understood that the magnetic fluxes generated by the first differential mode current I1, the second differential mode current I2, and the third differential mode current I3 at the same position of the magnetic structure 20 will all superimpose on each other.
  • FIG. 13 shows the magnetic flux generated when the magnetic structure 20 of the current transformer 500 shown in FIG. 11 is passed through by the first common mode current I1a, the second common mode current I2a and the third common mode current I3a. direction diagram.
  • the first common mode current I1a passes through the traveling channel 23 of the magnetic structure 20 along the first connection portion 31 of the first positive primary winding 30.
  • the first common mode current I1a generates a first common mode magnetic field B4.
  • the first common mode magnetic field The magnetic field direction of B4 is clockwise. Wherein, when the first common mode magnetic field B4 passes through the cross section of the fourth magnet 221, the first common mode magnetic field B4 is in the direction of the magnetic field of the fourth magnet 221 to the right, and the first common mode current I1a is in the direction of the fourth magnet 221 of the magnetic structure 20.
  • the positive direction of the generated magnetic flux (that is, the first common mode magnetic flux ⁇ 4) is to the right.
  • the second common mode current I2a passes through the traveling channel 23 of the magnetic structure 20 along the first fixed portion 41 of the second positive primary winding 40.
  • the second common mode current I2a generates a second common mode magnetic field B5.
  • the second common mode magnetic field The direction of B5 is clockwise. Wherein, when the second common mode magnetic field B5 passes through the cross section of the fourth magnet 221, the second common mode magnetic field B5 is in the direction of the magnetic field of the fourth magnet 221 to the right, and the second common mode current I2a is in the direction of the fourth magnet 221 of the magnetic structure 20.
  • the positive direction of the generated magnetic flux (that is, the second common mode magnetic flux ⁇ 5) is to the right. It can be understood that since the value of the first common mode current I1a is equal to the value of the second common mode current I2a, the second common mode magnetic flux ⁇ 5 is equal to the first common mode magnetic flux ⁇ 4.
  • the third common mode current I3a passes through the traveling channel 23 of the magnetic structure 20 along the first conductive portion 51 of the negative primary winding 50, and the third common mode current I3a generates a third common mode magnetic field B6.
  • the direction of the third common mode magnetic field B6 is counterclockwise. Wherein, when the third common mode magnetic field B6 passes through the cross section of the fourth magnet 221, the third common mode magnetic field B6 is in the magnetic field direction of the fourth magnet 221 to the left, and the third common mode current I3a is in the second magnet 212 of the magnetic structure 20.
  • the positive direction of the generated magnetic flux (that is, the third common mode magnetic flux ⁇ 6) is to the left.
  • the third common mode current I3a is the combined current of the first common mode current I1a and the second common mode current I2a
  • the value of the third common mode current I3a is the same as the value of the first common mode current I1a and the second common mode current I2a.
  • the sum of the values of the mode current I2a is equal
  • the third common mode magnetic flux ⁇ 6 is equal to the sum of the first common mode magnetic flux ⁇ 4 and the second common mode magnetic flux ⁇ 5. Therefore, the third common mode magnetic flux ⁇ 6 cancels out the first common mode magnetic flux ⁇ 4 and the second common mode magnetic flux ⁇ 5. It can be understood that the magnetic fluxes generated by the first common mode current I1a, the second common mode current I2a and the third common mode current I3a at the same position of the magnetic structure 20 will cancel each other.
  • the current transformer 500 When the current transformer 500 is used in the photovoltaic power generation system 1000, the multiple currents output by the photovoltaic modules (including the first photovoltaic module 900 and the second photovoltaic module 900a) flow. After passing through the current transformer 500 of the photovoltaic converter 800a, the magnetic fluxes generated by the first differential mode current I1, the second differential mode current I2, and the third differential mode current I3 in the magnetic structure 20 are superimposed on each other, and the first common mode current I1a, The magnetic fluxes generated by the second common mode current I2a and the third common mode current I3a cancel each other.
  • the magnetic flux generated by the magnetic structure 20 is mainly the magnetic flux generated by the differential mode current, and the first induced current I4 and the second induced current I5 generated by the first secondary winding 60 and the second secondary winding 70 are differential mode.
  • the induced current corresponding to the current achieves the effect of suppressing the common mode current. Since the arc signal is a differential mode current signal, the noise impact caused by the common mode current is reduced, and independent measurement of the differential mode current is achieved, which is beneficial to the detection of the arc signal by the subsequent detection module 100a and improves the arc signal. Arc detection accuracy and speed.
  • each differential mode current and each common mode current can pass through the magnetic structure 20 perpendicularly. In this way, the magnetic flux generated by the common mode current and the differential mode current in the magnetic structure 20 will be larger, so that the first secondary winding 60 and the second secondary winding 70 can subsequently output the first induced current I4 and the second induced current I5.
  • the first connecting portion 31 of the first positive primary winding 30 , the first fixing portion 41 of the second positive primary winding 40 and the first conductive portion 51 of the negative primary winding 50 all pass through the magnetic structure 20 through channel 23, which makes the magnetic flux generated by the common mode current transmitted on the three primary windings (ie, the first common mode current I1a, the second common mode current I2a and the third common mode current I3a) have the same
  • the magnetic circuit is more conducive to suppressing the noise impact caused by the common-mode current, improving the common-mode noise suppression capability of the current transformer 500, and is more conducive to subsequent detection of arcing signals.
  • the first conductive part 51 is located between the first connecting part 31 and the first fixed part 41, it is beneficial to the sum of magnetic flux generated by the common mode current transmitted between the first connecting part 31 and the first fixed part 41 (th.
  • the mutual cancellation further improves the ability of the current transformer 500 to suppress common mode noise, which is more conducive to subsequent detection of arcing signals.
  • arc-drawing signals can be collected once from the multiple currents output by the photovoltaic module (including the first photovoltaic module 900 and the second photovoltaic module 900a), so that the arc-drawing signals in the multiple currents can be collected.
  • the arc signal is detected once to avoid collecting the arc signal for each current, thereby avoiding multiple detection of arc signals in multiple currents.
  • the design of the current transformer 500 is not only conducive to improving the arc signal collection efficiency, but also has a simple structure, which is conducive to reducing detection costs.
  • the first secondary winding 60 is wound on the magnetic structure 20 and installed in the fixing member 10 .
  • the first secondary winding 60 is wound on the fourth magnet 221 of the magnetic structure 20 .
  • the first secondary winding 60 can also be wound around, but not limited to, the first magnet 211, the second magnet 212, the third magnet 213, the fifth magnet 222 or the sixth magnet 223. This application The position of the first secondary winding 60 is not specifically limited.
  • the first secondary winding 60 is a coil wound by a first conductive wire.
  • the first conductive wire is a copper wire.
  • the first conductive line may also be made of silver, aluminum or other conductive metal materials or other materials.
  • the first secondary winding 60 includes a first output terminal 61 and a second output terminal 62.
  • the first output terminal 61 is installed in the seventh through hole 17 of the fixing member 10 by welding, gluing or interference fit.
  • the two output terminals 62 are installed in the eighth through hole 18 of the fixing member 10 by welding, gluing or interference fitting.
  • the first output end 61 and the second output end 62 are both located at least on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • the first output end 61 and the second output end 62 are both located on the side of the magnetic structure 20 facing the fifth end 5211 , the fourth end 4311 and the second end 3311 , and the first output end 61 is located at the fourth end 4311 between the fifth end 5211 and the fourth end 4311 and the fifth end 5211 .
  • the second output terminal 62 is located between the first output terminal 61 and the fourth end portion 4311 and is spaced apart from the first output terminal 61 and the fourth end portion 4311 .
  • the first secondary winding 60 is connected to the circuit board 700 . In some embodiments, the first output terminal 61 and the second output terminal 62 of the first secondary winding 60 are respectively connected to two detection traces 7071.
  • the first output terminal 61 and the second output terminal 62 are respectively connected to two detection traces 7071 by means including but not limited to welding.
  • the circuit board 700 is respectively provided with a seventh plug hole (not shown) and an eighth plug hole at the ends of the two detection traces 7071, and the hole wall of each plug hole is plated with a metal layer.
  • the first output terminal 61 and the second output terminal 62 are respectively inserted into and welded into the seventh plug hole and the eighth plug hole. Therefore, the first output terminal 61 and the second output terminal 62 are electrically connected and fixedly connected to the two detection traces 7071 respectively.
  • the first output terminal 61 and the second output terminal 62 are electrically connected to the detection module 100a respectively.
  • the first secondary winding 60 can output the first induced current I4 according to the magnetic flux generated by the primary winding in the magnetic structure 20 .
  • the detection module 100a After the first induced current I4 is output through the first output terminal 61 and the second output terminal 62, it is transported to the detection module 100a along the two detection traces 7071, so that the detection module 100a can detect the arc current signal in the first induction current I4. detection.
  • the sum of the magnetic fluxes generated by the primary winding in the magnetic structure 20 refers to the first differential mode current I1, the second differential mode current I2, the third differential mode current I3, the first common mode current I1a, The sum of the magnetic flux generated by the second common mode current I2a and the third common mode current I3a.
  • the sum of the magnetic fluxes generated by the primary winding in the magnetic structure 20 is the first magnetic flux ⁇ 1, the second magnetic flux ⁇ 2, the third magnetic flux ⁇ 3, the first common mode magnetic flux ⁇ 4, the second magnetic flux ⁇ 4, and the first common mode flux ⁇ 4.
  • the first secondary winding 60 mainly outputs the first magnetic flux according to the magnetic flux generated by the differential mode current. Induced current I4; and because the arc signal is a differential mode signal, this facilitates the subsequent detection module 100a to detect the arc current signal in the first induced current I4, thereby improving the accuracy and speed of subsequent arc detection.
  • first output terminal 61 and the second output terminal 62 are both installed in the fixing member 10 and are at least partially located on the side of the fixing member 10 facing away from the magnetic structure 20 is beneficial to the first secondary winding 60 Connected to circuit board 700.
  • the second secondary winding 70 is wound on the magnetic structure 20 and installed in the fixing member 10 .
  • the second secondary winding 70 is wound on the fourth magnet 221 of the magnetic structure 20 and is spaced apart from the first secondary winding 60 .
  • the second secondary winding 70 can also be wound around, but not limited to, the first magnet 211, the second magnet 212, the third magnet 213, the fifth magnet 222 or the sixth magnet 223. This application The position of the second secondary winding 70 is not specifically limited.
  • the second secondary winding 70 is a coil wound by a second conductive wire.
  • the second conductive wire is a copper wire.
  • the second conductive line may also be made of silver, aluminum or other conductive metal materials or other materials.
  • the second secondary winding 70 includes a third output terminal 71 and a fourth output terminal 72.
  • the third output terminal 71 is installed in the ninth through hole 19 of the fixing member 10 by welding, gluing or interference fit.
  • the four output terminals 72 are installed in the tenth through hole 19a of the fixing member 10 through welding, gluing or interference fit. in.
  • the third output terminal 71 and the fourth output terminal 72 are both located at least on the side of the fixing member 10 facing away from the magnetic structure 20 .
  • the third output terminal 71 and the fourth output terminal 72 are both located on the side of the magnetic structure 20 facing the fifth end 5211 , the fourth end 4311 and the second end 3311 , and the third output terminal 71 is located at the fifth end 5211 between the first output terminal 61 and the fifth end 5211 and the first output terminal 61 .
  • the fourth output terminal 72 is located between the third output terminal 71 and the first output terminal 61 and is spaced apart from the third output terminal 71 and the first output terminal 61 .
  • the second secondary winding 70 is connected to the circuit board 700 .
  • the third output terminal 71 and the fourth output terminal 72 of the second secondary winding 70 are respectively connected to two self-test traces 7072.
  • the third output terminal 71 and the fourth output terminal 72 are respectively connected to two self-test traces 7072 by means including but not limited to welding.
  • the circuit board 700 is respectively provided with a ninth plug hole (not shown) and a tenth plug hole at the ends of the two self-test traces 7072, and the hole wall of each plug hole is plated with a metal layer.
  • the third output terminal 71 and the fourth output terminal 72 are inserted into and welded into the ninth plug hole and the tenth plug hole respectively. Therefore, the third output terminal 71 and the fourth output terminal 72 are electrically connected and fixedly connected to the two self-test traces 7072 respectively.
  • the third output terminal 71 and the fourth output terminal 72 are electrically connected to the detection module 100a respectively.
  • the second secondary winding 70 can output a second induced current according to the magnetic flux generated by the primary winding in the magnetic structure 20 I5.
  • the detection module 100a outputs a simulated arc signal according to the second induced current I5 to facilitate self-testing of the detection module 100a.
  • the magnetic flux generated by the primary winding in the magnetic structure 20 is mainly the magnetic flux generated by the differential mode current.
  • the number of turns of the first secondary winding 60 is different from the number of turns of the second secondary winding 70 .
  • the first induced current I4 output by the first secondary winding 60 is different from the second induced current I4 output by the second secondary winding 70 .
  • the value of the induced current I5 is different.
  • the number of turns of the first secondary winding 60 and the number of turns of the second secondary winding 70 may also be the same, so that the first induced current I4 output by the first secondary winding 60 is the same as the number of turns of the second secondary winding 60 .
  • the value of the second induced current I5 output by 70 is the same, and this application does not impose specific restrictions on this.
  • the first secondary winding 60 and the second secondary winding 70 can respectively output a current according to the magnetic flux generated by the current transmitted on each primary winding. If the number of turns of the second secondary winding 70 and the first secondary winding 60 are different, the magnitude of the current output by the second secondary winding 70 is different from the magnitude of the current output by the first secondary winding 60; if the second secondary winding 70 70 has the same number of turns as the first secondary winding 60 , and the magnitude of the current output by the second secondary winding 70 is the same as the magnitude of the current output by the first secondary winding 60 .
  • the current transformer 500 can be provided with multiple secondary windings with different or the same number of turns to output multiple channels of the same or different currents that meet the requirements.
  • the design in which the third output terminal 71 and the fourth output terminal 72 are both installed in the fixing member 10 and are at least partially located on the side of the fixing member 10 facing away from the magnetic structure 20 is beneficial to the second secondary winding 70 Connected to circuit board 700.
  • the DC power output by the first photovoltaic module 900 and the second photovoltaic module 900a is transmitted to the power conversion circuit 100b through the current transformer 500.
  • the power conversion circuit 100b outputs alternating current power based on the direct current power.
  • the current transformer 500 can be used to detect arcing on the DC side of the photovoltaic converter 800a.
  • an arcing fault occurs on the DC side of the photovoltaic converter 800a (for example, an arcing fault occurs on the first photovoltaic module 900 or the second photovoltaic module 900a due to aging)
  • the DC current received by the DC side of the photovoltaic converter 800a will have arcing.
  • signal (a differential mode signal)
  • the current transformer 500 collects the arcing signal from the above-mentioned DC current to facilitate subsequent detection of the arcing signal.
  • the current transformer 500 transmits multiple currents received from the DC side of the photovoltaic converter 800a through the first positive primary winding 30, the second positive primary winding 40, and the negative primary winding 50.
  • the first secondary winding 60 couples and outputs a first induced current I4 according to the current transmitted on each primary winding.
  • the arcing signal can be transmitted to Subsequent devices are used to detect arc signals. Therefore, through the current transformer 500 provided in this application, the arcing signals of multiple currents received from the DC side of the photovoltaic converter 800a can be collected once, so that the arcing signals in the multiple currents can be detected once.
  • the design of the current transformer 500 is not only conducive to improving the arc signal collection efficiency, but also has a simple structure, which is conducive to reducing detection costs. It is also conducive to reducing the number of current transformers 500, conducive to reducing the floor area, and thus conducive to Miniaturized design of photovoltaic converter 800a.
  • the DC current received by the DC side of the photovoltaic converter 800a will also contain a common mode noise signal, that is, the first photovoltaic module 900 will output the first differential mode current I1 and the first common mode current I1a, the second photovoltaic module 900a will output the second differential mode current I2 and the second common mode current I2a.
  • the first positive primary winding 30 transmits the first differential mode current I1 and the first common mode current I1a.
  • the first differential mode current I1 and the first common mode current I1a both flow from the first end 3211 to the second end 3311.
  • the second positive primary winding 40 transmits the second differential mode current I2 and the second common mode current I2a.
  • the second differential mode current I2 and the second common mode current I2a both flow from the third end 4211 to the fourth end 4311.
  • the negative primary winding 50 transmits the third differential mode current I3 (the combined current of the first differential mode current I1 and the second differential mode current I2) and the third common mode Current I3a (the combined current of the first common mode current I1a and the second common mode current I2a), the third differential mode current I3 flows from the sixth end 5311 to the fifth end 5211, and the third common mode current I3a flows from the fifth end 5311 to the fifth end 5211.
  • the end 5211 flows to the sixth end 5311.
  • the first end 3211 , the third end 4211 and the sixth end 5311 are located on one side of the magnetic structure 20
  • the fifth end 5211 , the fourth end 4311 and the second end 3311 are located on the other side of the magnetic structure 20
  • such a design makes the first differential mode current I1, the second differential mode current I2 and the third differential mode current I3 pass through the magnetic structure 20 in the same direction, and the magnetic fluxes generated by the above three in the magnetic structure 20 are superimposed on each other; such that The first common mode current I1a and the second common mode current I2a pass through the magnetic structure 20 in the same direction.
  • the third common mode current I3a passes through the magnetic structure 20 in the opposite direction to the above two.
  • the first common mode current I1a and the second common mode current I1a pass through the magnetic structure 20 in the opposite direction.
  • the sum of the magnetic flux generated by the common mode current I2a in the magnetic structure 20 cancels out the magnetic flux generated by the third common mode current I3a in the magnetic structure 20 . Therefore, the magnetic flux generated by the magnetic structure 20 is mainly the magnetic flux generated by the differential mode current.
  • the first induced current I4 and the second induced current I5 coupled out by the first secondary winding 60 and the second secondary winding 70 are induced currents corresponding to the differential mode current. This achieves the effect of suppressing the common mode current, reduces the noise impact caused by the common mode current, and achieves independent measurement of the differential mode current, which is beneficial to the subsequent detection of arc signals and improves the accuracy of subsequent arc detection. and speed.
  • the first common mode current I1a and the second common mode current The magnetic flux generated by I2a and the third common mode current I3a has the same magnetic path, which is more conducive to suppressing the noise impact caused by the common mode current and is more conducive to subsequent detection of arcing signals.
  • the current transformer 500 provided in this application can also avoid the intersection of the traces provided on the circuit board 700 for connecting to the current transformer 500, that is, the first trace 7011 and the second trace can be avoided from crossing.
  • Line 7012, third line 7013, fourth line 7021, fifth line 7022, sixth line 7023, detection line 7071 and self-test line 7072 cross.
  • the current transformer 500 provided by this application avoids the problem of difficult wiring on the board, facilitates wiring on the circuit board 700, reduces the difficulty of wiring on the circuit board 700, and reduces the design cost of wiring.
  • Figure 14 is a schematic three-dimensional structural diagram of a current transformer 500 provided by another embodiment of the present application.
  • Figure 15 is a schematic diagram of the back edge B-B of the current transformer 500 and the circuit board 700 shown in Figure 14. Partial structural diagram of line section.
  • the current transformer 500 includes a fixed component 10 , a magnetic structure 20 , a first positive primary winding 30 , a second positive primary winding 40 , a negative primary winding 50 , a first secondary winding 60 and a second secondary winding 70 .
  • the magnetic structure 20 is fixedly connected to the fixing member 10 .
  • the first positive primary winding 30 passes through the magnetic structure 20 and does not contact.
  • the first positive primary winding 30 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the second positive primary winding 40 passes through the magnetic structure 20 and does not contact.
  • the second positive primary winding 40 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the negative primary winding 50 passes through the magnetic structure 20 and does not contact.
  • the negative primary winding 50 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the first secondary winding 60 is wound on the magnetic structure 20 .
  • the first secondary winding 60 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the second secondary winding 70 is wound on the magnetic structure 20 .
  • the second secondary winding 70 passes through the fixing part 10 and is fixedly connected to the fixing part 10 .
  • the first positive primary winding 30 is connected to the first wiring 7011 and the fourth wiring 7021, and the first positive primary winding 30 is electrically connected to the first positive output terminal 901 and the second boost unit 402,
  • the first positive primary winding 30 is used to transmit the first differential mode current I1 and the first common mode current I1a.
  • the first differential mode current I1 and the first common mode current I1a are transmitted from the first positive output terminal 901 through the first connection terminal. 601 and the first positive primary winding 30 are sent to the second boost unit 402.
  • the second positive primary winding 40 is connected to the second wiring 7012 and the fifth wiring 7022.
  • the second positive primary winding 40 is electrically connected to the second positive output terminal 903 and the first boost unit 401.
  • the positive primary winding 40 is used to transmit the second differential mode current I2 and the second common mode current I2a.
  • the second differential mode current I2 and the second common mode current I2a are transmitted from the second positive output terminal 903 through the second terminal 602 and
  • the second positive primary winding 40 is delivered to the first boost unit 401 .
  • the negative primary winding 50 is connected to the third wiring 7013 and the sixth wiring 7023.
  • the negative primary winding 50 is connected to the first negative output terminal 902, the second negative output terminal 904, the first boost unit 401 and the second boost unit.
  • the unit 402 is electrically connected, and the negative primary winding 50 is used to transmit the third differential mode current I3 and the third common mode current I3a.
  • the third differential mode current I3 passes through the negative voltage from the first boosting unit 401 and the second boosting unit 402.
  • the primary winding 50 is delivered to the third terminal 603; the third common mode current I3a is delivered from the third terminal 603 to the first boost unit 401 and the second boost unit 402 through the negative primary winding 50.
  • the first secondary winding 60 is connected to the two detection traces 7071, and is electrically connected to the detection module 100a.
  • the first secondary winding 60 is used to connect the first positive primary winding 30 and the first positive primary winding 30 according to the transmission.
  • the current coupling in the two positive primary windings 40 and the negative primary winding 50 outputs the first induced current I4, specifically based on the magnetic flux sum, the first induced current I4 is output.
  • the second secondary winding 70 is connected to the two self-test traces 7072.
  • the second secondary winding 70 is electrically connected to the detection module 100a.
  • the second secondary winding 70 is used to transmit power between the first positive primary winding 30 and the detection module 100a according to the transmission.
  • the current coupling in the second positive primary winding 40 and the negative primary winding 50 outputs the second induced current I5, specifically based on the magnetic flux sum, the second induced current I5 is output.
  • the sum of the magnetic fluxes is the first differential mode current I1, the second differential mode current I2, the third differential mode current I3, the first common mode current I1a, the second common mode current I2a and the third common mode current I3a.
  • the first positive primary winding 30 is connected to the first wiring 7011 and the fourth wiring 7021, and the first positive primary winding 30 is connected to the first wiring 7011 and the fourth wiring 7021.
  • a positive output terminal 901 and the second boost unit 402 are electrically connected; the second positive primary winding 40 is connected to the second wiring 7012 and the fifth wiring 7022, and the second positive primary winding 40 is connected to the second positive electrode.
  • the output terminal 903 and the first boosting unit 401 are electrically connected.
  • the first positive primary winding 30 includes a first end 3211 and a second end 3311 .
  • the first end 3211 and the second end 3311 are located on opposite sides of the magnetic structure 20 , and both are located on the fixing member 10 The side facing away from the magnetic structure 20 .
  • the first positive primary winding 30 is connected to the circuit board 700 .
  • the first end 3211 is connected to the first wiring 7011
  • the second end 3311 is connected to the fourth wiring 7021.
  • the specific connection method may refer to the example in Figure 3 and will not be described again. It can be understood that the first end 3211 is electrically connected to the first positive output terminal 901, and the second end 3311 is electrically connected to the second boost unit 402.
  • the second end 3311 is electrically connected to the boost module 400 and The inverter module 300 is electrically connected. After the first differential mode current I1 and the first common mode current I1a are transmitted from the first end 3211 to the first positive primary winding 30 through the first wiring 7011, they are then transmitted from the second end along the first positive primary winding 30. 3311 is delivered to the fourth trace 7021.
  • the second positive primary winding 40 includes a third end 4211 and a fourth end 4311.
  • the third end 4211 is located on the side of the magnetic structure 20 facing the first end 3211 and is spaced apart from the first end 3211.
  • the four end portions 4311 are located on the side of the magnetic structure 20 facing the second end portion 3311 and are spaced apart from the second end portion 3311 .
  • the third end 4211 is located on the side of the first end 3211 close to the second end 3311 and is spaced apart from the first end 3211; along the The second end 3311 is away from the side of the first end 3211 and is spaced apart from the second end 3311 .
  • the second positive primary winding 40 is connected to the circuit board 700 .
  • the third end 4211 is connected to the second wiring 7012
  • the fourth end 4311 is connected to the fifth wiring 7022.
  • the specific connection method may refer to the example in Figure 3 and will not be described again. It can be understood that the third end 4211 is electrically connected to the second positive output terminal 903 , and the fourth end 4311 is electrically connected to the first boost unit 401 . After the second differential mode current I2 and the second common mode current I2a are transmitted from the third end 4211 to the second positive primary winding 40 through the second wiring 7012, they are then transmitted from the fourth end along the second positive primary winding 40. 4311 is delivered to the fifth trace 7022.
  • the first differential mode current I1 flows from the first positive output terminal 901 along the first cable 801, the first wiring 7011, the first positive primary winding 30, and the fifth wiring 7022.
  • the first boosting unit 401, the eighth wiring 7025 and the sixth wiring 7023 are delivered to the negative primary winding 50.
  • the second differential mode current I2 flows from the second positive output terminal 903 along the second cable 802, the second wiring 7012, the second positive primary winding 40, the fourth wiring 7021, the second boost unit 402, and the The seventh trace 7024 and the sixth trace 7023 are delivered to the negative primary winding 50 .
  • the negative primary winding 50 includes a fifth end 5211 and a sixth end 5311.
  • the fifth end 5211 is located on the side of the magnetic structure 20 facing the second end 3311 and the fourth end 4311, and is connected to the second end 3311. and the fourth end 4311 spaced apart.
  • the sixth end 5311 is located on the side of the magnetic structure 20 facing the first end 3211 and the third end 4211 and is spaced apart from the first end 3211 and the third end 4211 . wherein, along the One side of the first end 3211 and spaced apart from the third end 4211 .
  • the negative primary winding 50 is connected to the circuit board 700 .
  • the fifth end 5211 is connected to the third wiring 7013
  • the sixth end 5311 is connected to the sixth wiring 7023.
  • the specific connection method may refer to the example in Figure 3 and will not be described again. It can be understood that the fifth end portion 5211 is electrically connected to the first negative output terminal 902 and the second negative output terminal 904, and the sixth end portion 5311 is electrically connected to the first boost unit 401 and the second boost unit 402, as well. That is to say, the sixth end 5311 is electrically connected to the boost module 400 and the inverter module 300 .
  • the third differential mode current I3 is transmitted from the sixth end 5311 to the negative primary winding 50 through the sixth trace 7023, and then is transmitted along the negative primary winding 50 from the fifth end 5211 to the third trace 7013.
  • the first end 3211 and the second end 3311 are both located on the side of the fifth end 5211 close to the sixth end 5311, and the third end 4211 and the fourth end 4311 are both located at the sixth end.
  • part 5311 is close to the side of the fifth end part 5211.
  • the fifth end 5211 and the sixth end 5311 are disposed in a staggered manner; in the first direction (ie, the X-axis direction), the third end 4211
  • the first end 3211 is located on the side of the third end 4211 facing away from the sixth end 5311
  • the fourth end 4311 is located on the side of the third end 4211 facing away from the sixth end 5311.
  • the side of the second end 3311 facing away from the fifth end 5211 is
  • the circuit board 700 wired according to the current transformer 500 designed in this way can avoid the intersection of multiple wires connected to the ends of each winding, avoid the problem of difficult wiring on the board, and facilitate the circuit design.
  • the wiring is provided on the board 700, which reduces wiring difficulties and reduces wiring design costs; moreover, while avoiding wiring crossing, the space utilization of the current transformer 500 is improved, which is beneficial to reducing the occupation of the current transformer 500.
  • the board area is beneficial to the miniaturization design of the current transformer 500.
  • the current transformer 500 provided in this embodiment can achieve the same technical effect. It can be understood that the relative position of the end of the first positive primary winding 30 and the end of the second positive primary winding 40 is not specifically limited in this application.
  • the current transformer 500 has many design possibilities, which facilitates design. .

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Abstract

本申请提供了一种光伏变换器以及光伏发电系统。光伏变换器用于与第一光伏模块及第二光伏模块电性连接，第一光伏模块包括第一正极输出端及第一负极输出端，第二光伏模块包括第二正极输出端及第二负极输出端。光伏变换器包括电流互感器及功率变换电路，电流互感器包括磁性结构、第一正电原边绕组、第二正电原边绕组、负电原边绕组及第一副边绕组。三个原边绕组均穿过磁性结构并间隔设置。两个正电原边绕组的一端部分别与第一正极输出端及第二正极输出端电性连接，两个正电原边绕组的另一端部与功率变换电路电性连接。负电原边绕组的一端部与两个负极输出端电性连接，另一端部与功率变换电路电性连接。第一副边绕组绕制在磁性结构上。占板面积小。

Description

光伏变换器以及光伏发电系统
本申请要求于2022年6月27日提交中国专利局、申请号为202210737173.6、申请名称为“光伏变换器以及光伏发电系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电气设备领域，尤其涉及一种光伏变换器以及光伏发电系统。
背景技术
光伏变换器为光伏发电系统的核心部件，光伏变换器用于将光伏模块输出的直流电转换为交流电输出。随着光伏模块的长时间使用，光伏模块老化易导致光伏发电系统中出现直流拉弧故障，进而导致火灾等事故发生。目前，常通过电流互感器(Current Transformer,CT)对光伏变换器的直流侧进行拉弧信号采集，以便对拉弧信号进行检测，进而避免因直流拉弧故障出现火灾等事故。但是，光伏模块通常输出多路直流电至光伏变换器，目前通过多个电流互感器对每一路直流电分别进行拉弧信号采集，存在采集效率差、结构复杂、成本高的问题。
发明内容
本申请提供了一种光伏变换器以及光伏发电系统，旨在解决拉弧信号采集方案采集效率差、结构复杂且成本高的问题。
第一方面，本申请实施例提供了一种光伏变换器，用于与第一光伏模块及第二光伏模块电性连接。第一光伏模块包括第一正极输出端及第一负极输出端，第二光伏模块包括第二正极输出端及第二负极输出端。光伏变换器包括电流互感器及功率变换电路。电流互感器包括磁性结构、第一正电原边绕组、第二正电原边绕组、负电原边绕组及第一副边绕组。第一正电原边绕组穿过磁性结构，第一正电原边绕组包括第一端部及第二端部，第一端部与第一正极输出端电性连接，第二端部与功率变换电路电性连接。第二正电原边绕组穿过磁性结构，并与第一正电原边绕组间隔，第二正电原边绕组包括第三端部及第四端部，第三端部与第二正极输出端电性连接，第四端部与功率变换电路电性连接。负电原边绕组穿过磁性结构，并与第一正电原边绕组及第二正电原边绕组间隔，负电原边绕组包括第五端部及第六端部，第五端部与第一负极输出端及第二负极输出端电性连接，第六端部与功率变换电路电性连接。第一副边绕组绕制在磁性结构上，第一副边绕组用于根据传输在第一正电原边绕组、第二正电原边绕组及负电原边绕组中的电流耦合输出第一感应电流。
本申请中，第一光伏模块及第二光伏模块输出的直流电经电流互感器输送至功率变换电路，功率变换电路根据所述直流电输出交流电。电流互感器可用于对光伏变换器的直流侧的拉弧检测。当光伏变换器的直流侧出现拉弧故障(例如第一光伏模块或第二光伏模块因老化出现拉弧故障)时，光伏变换器的直流侧接收到的直流电流会存在拉弧信号(一种差模信号)，电流互感器自上述直流电流中采集到拉弧信号，以便于后续对拉弧信号的检测。
本申请中电流互感器通过第一正电原边绕组、第二正电原边绕组以及负电原边绕组输送自光伏变换器的直流侧接收到的多路电流。根据电磁感应原理，第一副边绕组根据在各个原 边绕组上传输的电流产生的磁通和输出一路第一感应电流，拉弧信号可随第一副边绕组输出的第一感应电流输送至后续器件，以便对拉弧信号进行检测。从而，通过本申请提供的电流互感器，可对自光伏变换器的直流侧接收到的多路电流进行一次拉弧信号采集，从而可对多路电流中的拉弧信号进行一次检测，避免对每一路电流分别进行拉弧信号采集，进而避免对多路电流中的拉弧信号进行重复检测。电流互感器的设计，不仅有利于提高拉弧信号的采集效率，而且结构简单，有利于减少检测成本，还有利于减少电流互感器的数量，有利于减小占板面积，进而有利于光伏变换器的小型化设计。
一种可能的实施方式中，第一端部、第三端部及第六端部位于磁性结构的一侧，第五端部、第四端部及第二端部位于磁性结构的另一侧。
当光伏变换器的直流侧出现拉弧故障时，光伏变换器的直流侧接收到的直流电流还会存在共模噪声信号，即第一光伏模块会输出第一差模电流及第一共模电流，第二光伏模块会输出第二差模电流及第二共模电流。第一正电原边绕组传输第一差模电流及第一共模电流，第一差模电流及第一共模电流均自第一端部流向第二端部。第二正电原边绕组传输第二差模电流及第二共模电流，第二差模电流及第二共模电流均自第三端部流向第四端部。负电原边绕组传输第三差模电流(第一差模电流及第二差模电流的合路电流)及第三共模电流(第一共模电流及第二共模电流的合路电流)，第三差模电流自第六端部流向第五端部，第三共模电流自第五端部流向第六端部。
由于第一端部、第三端部及第六端部位于磁性结构的一侧，第五端部、第四端部及第二端部位于磁性结构的另一侧，这样的设计使得第一差模电流、第二差模电流及第三差模电流穿过磁性结构的方向相同，上述三者在磁性结构产生的磁通相互叠加；使得第一共模电流与第二共模电流穿过磁性结构的方向相同，第三共模电流穿过磁性结构的方向与上述二者相反，第一共模电流及第二共模电流在磁性结构产生的磁通之和、与第三共模电流在磁性结构产生的磁通相抵消，从而达到抑制共模电流的效果，减小了共模电流带来的噪声影响，实现了对差模电流的独立测量，有利于后续对拉弧信号的检测，有利于提高后续拉弧检测的精度及速度。
一种可能的实施方式中，磁性结构具有穿行通道，第一正电原边绕组包括第一连接部，第二正电原边绕组包括第一固定部，负电原边绕组包括第一导电部，第一连接部、第一固定部及第一导电部均穿过穿行通道并间隔设置，第一导电部位于第一连接部及第一固定部之间；
其中，沿穿行通道的延伸方向上，第一端部与第二端部位于第一连接部的相对两端，第三端部位于第一固定部朝向第一端部的一端，第四端部位于第一固定部朝向第二端部的另一端，第五端部位于第一导电部朝向第二端部及第四端部的一端，第六端部位于第一导电部朝向第一端部及第三端部的另一端。
这样，由于第一正电原边绕组的第一连接部、第二正电原边绕组的第一固定部以及负电原边绕组的第一导电部均穿过磁性结构的穿行通道，这使得传输在三个原边绕组上的共模电流所产生的磁通具有相同的磁路，更有利于抑制共模电流带来的噪声影响，提高了电流互感器对共模噪声的抑制能力，更有利于后续对拉弧信号的检测。而且，由于第一导电部位于第一连接部与第一固定部之间，有利于在第一连接部及第一固定部传输的共模电流所产生的磁通之和与在第一导电部传输的共模电流所产生的磁通相抵消，进一步提高了电流互感器对共模噪声的抑制能力，更有利于后续对拉弧信号的检测。
一种可能的实施方式中，光伏变换器还包括电路板，电路板与第一光伏模块及第二光伏模块电性连接，电路板与第一端部、第二端部、第三端部、第四端部、第五端部、第六端部及功率变换电路固定连接且电性连接，第一端部与第二端部均位于第五端部靠近第六端部的一侧，第三端部与第四端部均位于第六端部靠近第五端部的一侧。
这样，电流互感器及功率变换电路通过电路板电性连接并形成一个整体，且电流互感器可通过电路板与第一光伏模块及第二光伏模块电性连接。其中，电流互感器的各个绕组的两个端部可分别与设于电路板上的多根走线一一连接，以与其他电子器件电性连接。由于第一端部与第二端部均位于第五端部朝向第六端部的一侧，第三端部与第四端部均位于第六端部朝向第五端部的一侧。根据这样设计的电流互感器布线的电路板，可避免设置在其上与上述各个端部连接的多个走线发生交叉，避免板上走线困难的问题，有利于在电路板上设置走线，降低了布线困难，减少了布线的设计成本。
一种可能的实施方式中，沿磁性结构的高度方向上，第一导电部位于第一连接部及第一固定部之间，沿穿行通道的延伸方向上，第五端部与第六端部错位设置；在第一方向上，第三端部与第四端部均位于第五端部与第六端部之间，第一端部位于第三端部背向第六端部的一侧，第二端部位于第四端部背向第五端部的一侧；第一方向与穿行通道的延伸方向垂直，且与磁性结构的高度方向垂直。
这样，根据这样设计的电流互感器布线的电路板，可避免设置在其上与各个绕组的端部连接的多个走线发生交叉，避免板上走线困难的问题，有利于在电路板上设置走线，降低了布线困难，减少了布线的设计成本；而且，在避免走线交叉的同时，提高了电流互感器的空间利用率，有利于减小电流互感器的占板面积，有利于电流互感器的小型化设计。
一种可能的实施方式中，沿磁性结构的高度方向上，第一导电部位于第一连接部及第一固定部之间，沿穿行通道的延伸方向上，第五端部与第六端部错位设置；在第一方向上，第三端部与第二端部均位于第五端部与第六端部之间，第一端部位于第三端部背向第六端部的一侧，第四端部位于第二端部背向第五端部的一侧；第一方向与穿行通道的延伸方向垂直，且与磁性结构的高度方向垂直。
这样，根据这样设计的电流互感器布线的电路板，可避免设置在其上与各个绕组的端部连接的多个走线发生交叉，避免板上走线困难的问题，有利于在电路板上设置走线，降低了布线困难，减少了布线的设计成本；而且，在避免走线交叉的同时，提高了电流互感器的空间利用率，有利于减小电流互感器的占板面积，有利于电流互感器的小型化设计。
一种可能的实施方式中，第一正电原边绕组包括第二连接部及第三连接部，第二连接部与第三连接部均沿磁性结构的高度方向延伸，第二连接部与第三连接部分别与第一连接部的相对两端部连接，第二连接部与第三连接部位于磁性结构的相对两侧，第二连接部背向第一连接部的端部为第一端部，第三连接部背向第一连接部的端部为第二端部。
第二正电原边绕组包括第二固定部及第三固定部，第二固定部与第三固定部均沿磁性结构的高度方向延伸，第二固定部与第三固定部分别与第一固定部的相对两端部连接，第二固定部位于磁性结构朝向第二连接部的一侧，并与第二连接部间隔设置，第三固定部位于磁性结构朝向第三连接部的一侧，并与第三连接部间隔设置，第二固定部背向第一固定部的端部 为第三端部，第三固定部背向第一固定部的端部为第四端部。
负电原边绕组包括第二导电部及第三导电部，第二导电部与第三导电部均沿磁性结构的高度方向延伸，所述第二导电部与第三导电部分别与第一导电部的相对两端部连接，第二导电部位于磁性结构朝向第三连接部及第三固定部的一侧，并与第三连接部及第三固定部间隔设置，第三导电部位于磁性结构朝向第二连接部及第二固定部的一侧，并与第二连接部及第二固定部间隔设置，第二导电部背向第一导电部的端部为第五端部，第三导电部背向第一导电部的端部为第六端部。
这样设置的第一正电原边绕组、第二正电原边绕组以及负电原边绕组结构稳定，有利于提高电流互感器的整体结构稳定性，且便于与电路板连接，从而便于将电流互感器装于电路板上，有利于降低装配难度。
一种可能的实施方式中，第一连接部、第一固定部、第一导电部均沿穿行通道的延伸方向延伸。
这样，由于第一连接部、第一固定部及第一导电部均沿穿行通道的延伸方向延伸，传输在第一连接部、第一固定部及第一导电部传输的各个差模电流及各个共模电流均能垂直穿过磁性结构。这样，共模电流与差模电流在磁性结构产生的磁通会更大，便于第一副边绕组输出第一感应电流。
一种可能的实施方式中，沿穿行通道的延伸方向上，第一端部与第二端部的间距、第三端部与第四端部的间距、以及第五端部与第六端部的间距均相等。
这样，有利于减小电流互感器在穿行通道的延伸方向上的尺寸，有利于减小电流互感器的占板面积，便于电流互感器的小型化设计。
一种可能的实施方式中，在与所述穿行通道的延伸方向垂直的方向上，第一连接部的投影、第一固定部的投影及第一导电部的投影均重叠。
这样，有利于提高第一正电原边绕组、第二正电原边绕组以及负电原边绕组在穿行通道中的空间利用率，有利于减小电流互感器的占板面积，便于电流互感器的小型化设计。
一种可能的实施方式中，磁性结构设有气隙，气隙连通穿行通道。
气隙的设计，有效减小了磁性结构的磁导率，有效增大了磁性结构的饱和磁化强度，避免磁性结构在工作过程中出现磁饱和现象，且结构简单，便于设计。
一种可能的实施方式中，磁性结构包括第一磁芯及第二磁芯，第一磁芯与第二磁芯间隔相对并具有气隙。
这样，通过改变第一磁芯与第二磁芯的相对位置，就可改变气隙的长度，进而改变磁性结构的磁导率及饱和磁化强度，便于根据需要调整磁性结构的磁导率及饱和磁化强度的大小，以避免磁性结构在工作过程中出现磁饱和现象，不仅调整难度低，而且可避免对第一磁芯及第二磁芯进行多次加工，有利于节省加工成本。
一种可能的实施方式中，电流互感器还包括固定件，磁性结构与固定件固定连接，第一正电原边绕组、第二正电原边绕组及负电原边绕组穿装于固定件中，第一端部、第二端部、 第三端部、第四端部、第五端部以及第六端部位于固定件背向磁性结构的一侧。
这样，磁性结构、第一正电原边绕组、第二正电原边绕组以及负电原边绕组通过固定件组装在一起，结构简单且稳定，有利于提高电流互感器的整体结构稳定性。而且，第一端部、第二端部、第三端部、第四端部、第五端部以及第六端部位于固定件背向磁性结构的一侧的设计，便于电流互感器与电路板安装，降低了装配难度。
一种可能的实施方式中，电流互感器还包括第二副边绕组，第二副边绕组绕制在磁性结构上，并与第一副边绕组间隔，第二副边绕组用于根据传输在第一正电原边绕组、第二正电原边绕组及负电原边绕组中的电流耦合输出第二感应电流。
这样，根据电磁感应原理，第二副边绕组同样可根据在各个原边绕组上传输的电流产生的磁通和输出一路电流。若第二副边绕组与第一副边绕组的匝数不同，第二副边绕组输出的电流的大小与第一副边绕组输出的电流的大小不同；若第二副边绕组与第一副边绕组的匝数相同，第二副边绕组输出的电流的大小与第一副边绕组输出的电流的大小相同。电流互感器可设置匝数不同或者相同的多个副边绕组，以输出满足需求的多路相同或者不同电流。
一种可能的实施方式中，功率变换电路包括升压模块及逆变模块，升压模块与第二端部、第四端部及第六端部电性连接，并与逆变模块电性连接。
这样，自第一光伏模块及第二光伏模块输出的直流电经升压模块升压处理后，升压模块输出升压电流至逆变模块，逆变模块可对升压电流进行逆变处理以输出交流电，进而供给交流负载。升压模块的设计，保证逆变模块进行逆变处理后输出的交流电符合预期。
一种可能的实施方式中，光伏变换器还包括检测模块，检测模块与第一副边绕组电性连接。
这样，通过检测模块可对第一副边绕组输出的第一感应电流进行拉弧检测，以避免因拉弧故障出现的各种安全事故。
第二方面，本申请实施例还提供了一种光伏发电系统，包括第一方面任一项所述的光伏变换器、第一光伏模块及第二光伏模块，第一光伏模块包括第一正极输出端及第一负极输出端，第二光伏模块包括第二正极输出端及第二负极输出端，第一正极输出端与第一端部电性连接，第二正极输出端与第三端部电性连接，第一负极输出端及第二负极输出端均与第五端部电性连接。
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为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1是本申请实施例提供的光伏发电系统与交流负载配合的结构框图；
图2是图1所示光伏发电系统的结构示意图；
图3是本申请一实施例提供的电流互感器的立体结构示意图；
图4是图3所示电流互感器中固定件的立体结构示意图；
图5是图3所示电流互感器中磁性结构的立体结构示意图；
图6是图3所示电流互感器中固定件与磁性结构在另一角度的结构示意图；
图7是图3所示电流互感器中第一正电原边绕组的立体结构示意图；
图8是图3所示电流互感器与电路板配合后沿A-A线剖切的部分结构示意图；
图9是图3所示电流互感器中第二正电原边绕组的立体结构示意图；
图10是图3所示电流互感器中负电原边绕组的立体结构示意图；
图11是图3所示电流互感器(省略固定件、第一副边绕组及第二副边绕组)的立体结构示意图；
图12是图11所示电流互感器的磁性结构被第一差模电流、第二差模电流及第三差模电流穿过产生磁通的方向示意图；
图13是图11所示电流互感器的磁性结构被第一共模电流、第二共模电流及第三共模电流穿过产生的磁通的方向示意图；
图14是本申请又一实施例提供的电流互感器的立体结构示意图；
图15是图14所示电流互感器与电路板配合后沿B-B线剖切的部分结构示意图。
具体实施方式
本申请实施例提供了一种光伏变换器，应用于光伏发电系统。光伏发电系统是一种利用光生伏特效应，将太阳辐射能直接转换成电能的发电系统。本申请中，部件A与部件B连接指的是部件A与部件B直接连接或者间接连接；其中，连接包括固定连接及电性连接。
下面结合本申请实施例中的附图对本申请实施例进行描述。
请参阅图1及图2，图1是本申请实施例提供的光伏发电系统1000与交流负载2000配合的结构框图，图2是图1所示光伏发电系统1000的结构示意图。光伏发电系统1000用于将太阳辐射能转换为电能，以供给交流负载2000。
如图1所示，光伏发电系统1000包括第一光伏模块900、第二光伏模块900a、第一线缆组件800、光伏变换器800a以及第二线缆组件800b。第一光伏模块900与第二光伏模块900a用于将太阳能转换为直流电输出。第一光伏模块900及第二光伏模块900a与第一线缆组件800连接，第一线缆组件800与光伏变换器800a连接，第一线缆组件800用于将第一光伏模块900及第二光伏模块900a输出的直流电传输至光伏变换器800a。光伏变换器800a用于将第一光伏模块900及第二光伏模块900a输出的直流电转换为交流电输出。第二线缆组件800b与光伏变换器800a及交流负载2000连接，第二线缆组件800b用于将光伏变换器800a输出的交流电传输至交流负载2000，以供给交流负载2000。交流负载2000可以是冰箱、空调、市网等任何使用、存储或者传输交流电的设备或者装置，本申请对此不作限定。在其他一些实施例中，第一光伏模块900的数量也可以是更多个，例如两个、三个、四个等；第二光伏模块900a的数量也可以使更多个，例如两个、三个、四个等。
一些实施例中，光伏变换器800a包括电路板700、输入端子600、电流互感器500、升压模块400、逆变模块300、输出端子200、控制模块100以及检测模块100a。其中，升压模块400、逆变模块300及控制模块100构成功率变换电路100b。可以理解，功率变换电路100b包括升压模块400、逆变模块300及控制模块100。换言之，光伏变换器800a包括电路板700、输入端子600、电流互感器500、功率变换电路100b、输出端子200以及检测模块100a。
电路板700用于承载输入端子600、电流互感器500、升压模块400、逆变模块300、输出端子200、控制模块100以及检测模块100a。输入端子600与电流互感器500电性连接。 电流互感器500与升压模块400电性连接。升压模块400与逆变模块300电性连接。逆变模块300与输出端子200电性连接。控制模块100与升压模块400、逆变模块300以及检测模块100a电性连接。检测模块100a与电流互感器500电性连接。控制模块100用于控制升压模块400、逆变模块300以及检测模块100a工作，以控制光伏变换器800a工作。其中，输入端子600与第一线缆组件800连接。通过第一线缆组件800，输入端子600与第一光伏模块900及第二光伏模块900a电性连接。输出端子200与第二线缆组件800b连接。通过第二线缆组件800b，输出端子200与交流负载2000电性连接。可以理解，电路板700通过第一线缆组件800与输入端子600和第一光伏模块900及第二光伏模块900a电性连接。
第一光伏模块900及第二光伏模块900a输出的直流电沿第一线缆组件800依次经输入端子600及电流互感器500输送至升压模块400。升压模块400用于对第一光伏模块900及第二光伏模块900a输出的直流电进行升压处理后，输出升压电流至逆变模块300；其中，升压电流为直流电。逆变模块300用于对经升压模块400升压处理后的直流电(即升压电流)进行逆变处理，以将升压电流转换为交流电并输送至输出端子200。交流电通过输出端子200沿第二线缆组件800b输送至交流负载2000，以供给交流负载2000。可以理解，第一光伏模块900及第二光伏模块900a输出的电流经电流互感器500输送至功率变换电路100b，通过功率变换电路100b输出交流电，以供给交流负载2000。
电流互感器500用于根据第一光伏模块900及第二光伏模块900a输出的直流电输出感应电流至检测模块100a；其中，感应电流的值小于所述直流电的值。检测模块100a用于对感应电流进行拉弧检测，以判断感应电流中是否存在拉弧信号。若检测模块100a在感应电流中检测出拉弧信号，则输出控制信号至控制模块100。其中，控制信号用于控制光伏变换器800a停止工作。需要说明的是，拉弧信号指的是当光伏发电系统1000出现直流拉弧现象(例如第一光伏模块900及第二光伏模块900a因老化出现直流拉弧现象)时产生的差模电流信号。
如图1及图2所示，示例性的，第一光伏模块900及第二光伏模块900a均包括多个太阳能电池，多个太阳能电池阵列设置。第一光伏模块900包括第一正极输出端901及第一负极输出端902，第一正极输出端901位于第一负极输出端902的一侧并间隔设置。其中，第一负极输出端902的电位低于第一正极输出端901的电位。第一正极输出端901用于输出第一差模电流I1，第一负极输出端902用于接收第一差模电流I1。
第二光伏模块900a位于第一光伏模块900的一侧，第二光伏模块900a包括第二正极输出端903及第二负极输出端904，第二正极输出端903位于第二负极输出端904的一侧并间隔设置。其中，第二负极输出端904的电位低于第二正极输出端903的电位。第二正极输出端903用于输出第二差模电流I2，第二负极输出端904用于接收第二差模电流I2。其中，第二正极输出端903位于第一正极输出端901背向第一负极输出端902的一侧，第二负极输出端904位于第一负极输出端902背向第一正极输出端901的一侧。第二差模电流I2的值与第一差模电流I1的值相等。在其他一些实施例中，第一差模电流I1的值与第二差模电流I2的值也可不相等，本申请对此不作限定。
第一线缆组件800包括第一线缆801、第二线缆802、第三线缆803及第四线缆804。第二线缆802、第一线缆801、第三线缆803以及第四线缆804依次间隔设置。第一线缆801与第一正极输出端901及光伏变换器800a的输入端子600连接。第二线缆802与第二正极输出端903及光伏变换器800a的输入端子600连接。第三线缆803与第一负极输出端902及光伏变换器800a的输入端子600连接。第四线缆804与第二负极输出端904及光伏变换器800a的输入端子600连接。可以理解，第一光伏模块900通过第一线缆801及第三线缆803与光 伏变换器800a的输入端子600电性连接。第一光伏模块900自第一正极输出端901输出的第一差模电流I1沿第一线缆801经输入端子600输送至光伏变换器800a，经光伏变换器800a后通过输入端子600沿第三线缆803回流至第一负极输出端902。可以理解，第二光伏模块900a通过第二线缆802及第四线缆804与光伏变换器800a的输入端子600电性连接。第二光伏模块900a自第二正极输出端903输出的第二差模电流I2沿第二线缆802经输入端子600输送至光伏变换器800a，经光伏变换器800a后通过输入端子600沿第四线缆804回流至第二负极输出端904。
需要说明的是，第一光伏模块900的第一正极输出端901输出的第一差模电流I1经光伏变换器800a回流至第一负极输出端902的过程中，光伏变换器800a会产生噪声信号，噪声信号存在于第一差模电流I1中；第二光伏模块900a的第二正极输出端903输出的第二差模电流I2经光伏变换器800a回流至第二负极输出端904的过程中，光伏变换器800a会产生噪声信号，噪声信号存在于第二差模电流I2中。其中，噪声信号包括共模噪声信号，即共模电流(从一个系统的一对正极输入端及负极输出端看，若电流的方向相同，则称电流为共模电流)。在本实施例中，第一线缆801及第三线缆803中输送的第一差模电流I1中均存在第一共模电流I1a；其中，在第一线缆801中传输的第一差模电流I1与第一共模电流I1a的方向相同，在第三线缆803中传输的第一差模电流I1与第一共模电流I1a的方向相反。第二线缆802及第四线缆804中输送的第二差模电流I2中均存在第二共模电流I2a；其中，在第二线缆802中传输的第二差模电流I2与第二共模电流I2a的方向相同，在第四线缆804中传输的第二差模电流I2与第二共模电流I2a的方向相反。其中，第一共模电流I1a的值与第二共模电流I2a的值相等。在其他一些实施例中，第一共模电流I1a的值与第二共模电流I2a的值也可不相等。
第二线缆组件800b包括三个第五线缆805，三个第五线缆805依次间隔排布。每个第五线缆805的一端与光伏变换器800a的输出端子200连接，另一端与交流负载2000连接。光伏变换器800a输出的交流电通过三个第五线缆805输送至交流负载2000。在其他一些实施例中，第五线缆805的数量还可以是更多个，例如六个、九个、十二个等，本申请对此不作具体限定。
示例性的，电路板700为矩形电路板。在其他一些实施例中，电路板700也可以是圆形电路板或三角形电路板等异形电路板，本申请对电路板的形状不作具体限定。电路板700上设有功能线路，功能线路包括第一线路701、第二线路702、第三线路703、第四线路704、第五线路705、第六线路706、第七线路707及第八线路708。示例性的，上述各个线路为采用如铜、铝等导电材料设置在电路板700上的导电层。下文结合光伏变换器800a的各个模块说明上述各个线路。
输入端子600设置于电路板700的一侧。一些实施例中，输入端子600设置于电路板700的长度方向上的一侧。输入端子600包括第一接线端子601、第二接线端子602以及第三接线端子603。沿电路板700的宽度方向上，第二接线端子602、第一接线端子601以及第三接线端子603依次排布设置于电路板700的一侧。其中，第一接线端子601与第一线缆801连接，第二接线端子602与第二线缆802连接，第三接线端子603与第三线缆803及第四线缆804连接。在其他一些实施例中，输入端子600还可以包括更多接线端子，例如四个、五个等，本申请对此不作具体限定。
沿电路板700的长度方向上，电流互感器500位于输入端子600的一端并与输入端子600电性连接。具体的，电流互感器500位于第一接线端子601、第二接线端子602及第三接线端子603的一端，并位于第二接线端子602的一侧。其中，电流互感器500与第一接线端子 601、第二接线端子602及第三接线端子603电性连接。
第一线路701位于输入端子600与电流互感器500之间，并与输入端子600及电流互感器500连接，第一线路701用于实现输入端子600与电流互感器500之间的电性连接。具体的，第一线路701包括第一走线7011、第二走线7012以及第三走线7013。沿电路板700的宽度方向上，第二走线7012、第一走线7011及第三走线7013依次排布。其中，第一走线7011的一端与第一接线端子601连接，另一端与电流互感器500连接。第二走线7012的一端与第二接线端子602连接，另一端与电流互感器500连接。第三走线7013的一端与第三接线端子603连接，另一端与电流互感器500连接。通过第一走线7011、第二走线7012及第三走线7013，第一接线端子601及第二接线端子602及第三接线端子603分别与电流互感器500电性连接。
升压模块400位于电流互感器500背向输入端子600的一端，并与电流互感器500电性连接。具体的，升压模块400包括第一升压单元401及第二升压单元402。在电路板700的宽度方向上，第一升压单元401与第二升压单元402间隔相对，其中，第一升压单元401位于电流互感器500的一端并与电流互感器500电性连接；第二升压单元402位于电流互感器500的一端并位于电流互感器500的一侧，且与与电流互感器500电性连接。
第二线路702位于电流互感器500与升压模块400之间，并与电流互感器500及升压模块400连接，第二线路702用于实现电流互感器500与升压模块400之间的电性连接。具体的，第二线路702包括第四走线7021、第五走线7022、第六走线7023、第七走线7024以及第八走线7025。沿电路板700的宽度方向上，第四走线7021、第五走线7022以及第六走线7023依次排布。第七走线7024与第五走线7022交叉并与第六走线7023连接。其中，第七走线7024的一端与第六走线7023的一端连接，第七走线7024的另一端位于第四走线7021与第五走线7022之间。第八走线7025位于第五走线7022背向第四走线7021的一侧，并与第六走线7023及第七走线7024连接。其中，第八走线7025的一端、与第六走线7023和第七走线7024连接的一端连接。
第四走线7021的一端与电流互感器500连接，另一端与第二升压单元402连接；第五走线7022的一端与电流互感器500连接，另一端与第一升压单元401连接；第六走线7023远离第七走线7024及第八走线7025的一端与电流互感器500连接；第七走线7024远离第六走线7023的一端与第二升压单元402连接；第八走线7025远离第六走线7023的一端与第一升压单元401连接。通过第四走线7021、第七走线7024及第六走线7023，第二升压单元402与电流互感器500电性连接；通过第五走线7022、第八走线7025及第六走线7023，第一升压单元401与电流互感器500电性连接。
逆变模块300位于升压模块400背向电流互感器500的一端，并与升压模块400电性连接。具体的，逆变模块300与第一升压单元401及第二升压单元402电性连接。第三线路703位于升压模块400与逆变模块300之间，并与升压模块400及逆变模块300连接，第三线路703用于实现升压模块400与逆变模块300之间的电性连接。具体的，第三线路703包括第一子线路7031及第二子线路7032。沿电路板700的宽度方向上，第一子线路7031与第二子线路7032间隔排布。其中，第一子线路7031的一端与第一升压单元401连接，另一端与逆变模块300连接；第二子线路7032的一端与第二升压单元402连接，另一端与逆变模块300连接。通过第一子线路7031及第二子线路7032。逆变模块300与第一升压单元401及第二升压单元402电性连接。
输出端子200位于逆变模块300背向升压模块400的一侧，并与逆变模块300电性连接。 第四线路704位于输出端子200与逆变模块300之间，并与逆变模块300及输出端子200连接，第四线路704用于实现输出端子200与逆变模块300之间的电性连接。具体的，第四线路704包括三个输出走线7041。沿电路板700的宽度方向上，三个输出走线7041依次间隔排布，每个输出走线7041的一端与逆变模块300连接，另一端与输出端子200连接。在其他一些实施例中，第四线路704还可包括更多输出走线7041，例如六个、九个等，本申请对此不作具体限定。其中，输出端子200与第二线缆组件800b的三个第五线缆805连接。
控制模块100位于升压模块400的一端，并与升压模块400及逆变模块300电性连接。具体的，控制模块100位于第二升压单元402背向第一升压单元401的一侧。第五线路705位于升压模块400与逆变模块300之间，并与控制模块100及升压模块400连接，第五线路705用于实现控制模块100与升压模块400的电性连接。具体的，第五线路705包括第一控制走线7051及第二控制走线7052。沿电路板700的宽度方向上，第一控制走线7051与第二控制走线7052间隔排布。其中，第一控制走线7051的一端位于第一子线路7031与第二子线路7032之间并与第一升压单元401连接；另一端位于第二子线路7032背向第一子线路7031的一侧并与控制模块100连接，第一控制走线7051与第二子线路7032交叉。
沿电路板700的宽度方向上，第二控制走线7052位于第二升压单元402与第一控制走线7051之间。沿电路板700的长度方向上，第二控制走线7052位于第一控制走线7051与第二子线路7032之间。第二控制走线7052的一端与第二升压单元402连接，另一端与控制模块100连接。通过第一控制走线7051及第二控制走线7052。控制模块100与第一升压单元401及第二升压单元402电性连接。
第六线路706位于控制模块100朝向逆变模块300的一侧，并位于逆变模块300朝向控制模块100的一端，且与控制模块100及逆变模块300连接。第六线路706用于实现控制模块100与逆变模块300的电性连接。具体的，第六线路706的一端位于第一控制走线7051背向第一子线路7031的一侧并与控制模块100连接，第六线路706的另一端与逆变模块300朝向控制模块100的一端连接。通过第六线路706，控制模块100与逆变模块300电性连接。由此，控制模块100可控制第一升压单元401、第二升压单元402及逆变模块300工作。
第一光伏模块900自第一正极输出端901输出的第一差模电流I1沿第一线缆801输送至第一接线端子601后，自第一接线端子601沿第一走线7011输送至电流互感器500。接着，自电流互感器500沿第四走线7021输送至第二升压单元402后，自第二升压单元402依次沿第七走线7024及第六走线7023输送至电流互感器500。然后，自电流互感器500沿第三走线7013输送至第三接线端子603后，自第三接线端子603沿第三线缆803回流至第一负极输出端902。
可以理解，第一走线7011、第四走线7021及第三走线7013中均传输第一差模电流I1及第一共模电流I1a。其中，在第一走线7011及第四走线7021中传输的第一差模电流I1及第一共模电流I1a的方向相同。具体的，第一差模电流I1及第一共模电流I1a均自第一接线端子601沿第一走线7011输送至电流互感器500后，沿第四走线7021输送至第二升压单元402。在第三走线7013及第六走线7023中传输的第一差模电流I1与第一共模电流I1a的方向相反。具体的，第一差模电流I1沿第六走线7023输送至电流互感器500后，沿第三走线7013输送至第三接线端子603；第一共模电流I1a自第三接线端子603沿第三走线7013输送至电流互感器500后，沿第六走线7023输送至第一升压单元401与第二升压单元402。
其中，当流经电流互感器500的第一差模电流I1沿第四走线7021输送至第二升压单元402时，控制模块100控制第二升压单元402对第一差模电流I1进行升压处理。第二升压单 元402对第一差模电流I1进行升压处理后，输出第一升压电流。换言之，第二升压单元402用于对第一差模电流I1进行升压处理后，输出第一升压电流。需要说明的是，第一升压电流为直流电，自第二升压单元402沿第七走线7024及第六走线7023输送至电流互感器500的第一差模电流I1并未进行升压处理。通过第二子线路7032，第一升压电流自第二升压单元402输送至逆变模块300。控制模块100控制逆变模块300对第一升压电流进行逆变处理，以将第一升压电流转换为第一交流电输出。通过多个输出走线7041，第一交流电自逆变模块300输送至输出端子200后，第一交流电沿多个第五线缆805输送至交流负载2000，以供给交流负载2000。
第二光伏模块900a自第二正极输出端903输出的第二差模电流I2沿第二线缆802输送至第二接线端子602后，自第二接线端子602沿第二走线7012输送至电流互感器500。接着，自电流互感器500沿第五走线7022输送至第一升压单元401后，自第一升压单元401依次沿第八走线7025及第六走线7023输送至电流互感器500。然后，自电流互感器500沿第三走线7013输送至第三接线端子603后，自第三接线端子603沿第四线缆804回流至第二负极输出端904。
可以理解，第二走线7012及第五走线7022中均传输第二差模电流I2及第二共模电流I2a。其中，在第二走线7012及第五走线7022中传输的第二差模电流I2及第二共模电流I2a的方向相同。具体的，第二差模电流I2及第二共模电流I2a均自第二接线端子602沿第二走线7012输送至电流互感器500后，沿第五走线7022输送至第一升压单元401。在第三走线7013及第六走线7023中传输的第二差模电流I2与第二共模电流I2a的方向相反。具体的，第二差模电流I2沿第六走线7023输送至电流互感器500后，沿第三走线7013输送至第三接线端子603；第二共模电流I2a自第三接线端子603沿第三走线7013输送至电流互感器500后，沿第六走线7023输送至第一升压单元401与第二升压单元402。
其中，当流经电流互感器500输出的第二差模电流I2沿第五走线7022输送至第一升压单元401时，控制模块100控制第一升压单元401对第二差模电流I2进行升压处理。第一升压单元401对第二差模电流I2进行升压处理后，输出第二升压电流。换言之，第一升压单元401用于对第二差模电流I2进行升压处理后，输出第二升压电流。需要说明的是，第二升压电流为直流电。自第一升压单元401沿第八走线7025及第六走线7023输送至电流互感器500的第二差模电流I2并未进行升压处理。
通过第一子线路7031，第二升压电流自第一升压单元401输送至逆变模块300。控制模块100控制逆变模块300对第二升压电流进行逆变处理，以将第二升压电流转换为第二交流电输出。通过多个输出走线7041，第二交流电自逆变模块300输送至输出端子200后，第二交流电自输出端子200沿多个第五线缆805输送至交流负载2000，以供给交流负载2000。
可以理解，由于自第一正极输出端901输出的第一差模电流I1，以及自第二正极输出端903输出的第二差模电流I2均沿第六走线7023、第三走线7013及第三线缆803回流至第三接线端子603，进而分别回流至第一负极输出端902及第二负极输出端904，第六走线7023及第三走线7013中传输的电流包括第一差模电流I1与第二差模电流I2的合路电流(即第三差模电流I3)。第三差模电流I3的值等于第一差模电流I1的值与第二差模电流I2的值的和。
由于第一共模电流I1a自第三接线端子603沿第三走线7013输送至电流互感器500后，沿第六走线7023输送至第一升压单元401与第二升压单元402；第二共模电流I2a自第三接线端子603沿第三走线7013输送至电流互感器500后，沿第六走线7023输送至第一升压单元401与第二升压单元402；第三走线7013及第六走线7023中传输的电流还包括第一共模 电流I1a与第二共模电流I2a的合路电流(即第三共模电流I3a)。第三共模电流I3a的值等于第一共模电流I1a的值与第二共模电流I2a的值的和。其中，第三共模电流I3a的方向与第三差模电流I3的方向相反。
需要说明的是，通过第一升压单元401及第二升压单元402分别对第二差模电流I2及第一差模电流I1进行升压处理后，自第一升压单元401沿第八走线7025及第六走线7023输送至电流互感器500的第一差模电流I1中存在第一纹波电流；自第二升压单元402依次沿第七走线7024及第六走线7023输送至电流互感器500的第二差模电流I2中存在第二纹波电流。上述第一纹波电流及第二纹波电流均为交流电。其中，第一纹波电流的相位为第一初始相位，第二纹波电流的相位为第二初始相位。
一些实施例中，控制模块100还用于对第一纹波电流及第二纹波电流进行移相处理，以使第一纹波电流与第二纹波电流的相位相反或近似相反。具体的，控制模块100对第一纹波电流进行第一移相处理，以使第一纹波电流的相位由第一初始相位转换为第一相位；控制模块100对第二纹波电流进行第二移相处理，以使第二纹波电流的相位由第二初始相位转换为第二相位。其中，第一相位与第二相位相反或近似相反。这样，随第一差模电流I1自第八走线7025输送至第六走线7023的第一纹波电流，与随第二差模电流I2自第七走线7024输送至第六走线7023的第二纹波电流在第六走线7023中相互抵消，避免在第六走线7023以及第三走线7013中传输的第三差模电流I3受到电流纹波的较大影响，避免电流互感器500输出的感应电流中存在较多的纹波噪声信号，进而避免纹波噪声信号干扰检测模块100a对拉弧信号的检测，有利于提高检测模块100a对感应电流中拉弧信号检测的精确度。
检测模块100a位于电流互感器500与逆变模块300之间，并位于升压模块400的一侧。具体的，检测模块100a位于第二升压单元402背向第一升压单元401的一侧。其中，检测模块100a与电流互感器500及控制模块100电性连接。
第七线路707位于检测模块100a与电流互感器500之间，并与检测模块100a及电流互感器500连接，第七线路707用于实现检测模块100a与电流互感器500之间的电性连接。具体的，第七线路707包括两个检测走线7071以及两个自测走线7072，两个检测走线7071以及两个自测走线7072依次间隔相对，每个检测走线7071及自测走线7072的一端与电流互感器500连接，另一端与检测模块100a连接。通过两个检测走线7071以及两个自测走线7072，电流互感器500与检测模块100a电性连接。在其他一些实施例中，自测走线7072可以省略。第八线路708位于检测模块100a与控制模块100之间，并与检测模块100a及控制模块100连接。第八线路708用于实现检测模块100a与控制模块100的电性连接。
如上文所述，第一差模电流I1、第二差模电流I2、第三差模电流I3、第一共模电流I1a、第二共模电流I2a及第三共模电流I3a均流经电流互感器500，电流互感器500可根据上述电流输出第一感应电流I4及第二感应电流I5。第一感应电流I4沿两个检测走线7071输送至检测模块100a，控制模块100控制检测模块100a对第一感应电流I4进行拉弧检测。换言之，检测模块100a用于对第一感应电流I4进行拉弧检测。若检测模块100a检测出拉弧信号，则检测模块100a沿第八线路708输出控制信号至控制模块100，控制模块100控制光伏变换器800a停止工作。
第二感应电流I5沿两个自测走线7072输送至检测模块100a。控制模块100可控制检测模块100a产生模拟拉弧信号，模拟拉弧信号用于检测模块100a的自检。换言之，检测模块100a还用于产生模拟拉弧信号，模拟拉弧信号用于检测模块100a的自检。具体的，当控制模块100控制检测模块100a产生模拟拉弧信号后，检测模块100a可输出控制信号至控制模块 100，以控制光伏变换器800a停止工作。这样，通过模拟拉弧信号可判断检测模块100a能否正常工作。
接下来，结合附图对本申请实施例提供的电流互感器500进行具体地描述。
请参阅图2及图3，图3是本申请一实施例提供的电流互感器500的立体结构示意图。
电流互感器500包括固定件10、磁性结构20、第一正电原边绕组30、第二正电原边绕组40、负电原边绕组50、第一副边绕组60以及第二副边绕组70。磁性结构20与固定件10固定连接。第一正电原边绕组30穿过磁性结构20且不接触。第一正电原边绕组30穿过固定件10与固定件10固定连接。第二正电原边绕组40穿过磁性结构20且不接触。第二正电原边绕组40穿过固定件10与固定件10固定连接。负电原边绕组50穿过磁性结构20且不接触。负电原边绕组50穿过固定件10与固定件10固定连接。第一副边绕组60绕制在磁性结构20上。第一副边绕组60穿过固定件10与固定件10固定连接。第二副边绕组70绕组在磁性结构20上。第二副边绕组70穿过固定件10与固定件10固定连接。
其中，第一正电原边绕组30与第一走线7011及第五走线7022连接，第一正电原边绕组30与第一正极输出端901及第一升压单元401电性连接，第一正电原边绕组30用于传输第一差模电流I1及第一共模电流I1a，第一差模电流I1及第一共模电流I1a自第一正极输出端901经第一接线端子601及第一正电原边绕组30输送至第一升压单元401。可以理解，第一正电原边绕组30与第一光伏模块900的第一正极输出端901及功率变换电路100b(如图1所示)的升压模块400电性连接。在其他一些实施例中，第一正电原边绕组30也可以与更多个第一光伏模块900的第一正极输出端901电性连接，例如两个、三个、四个等。
第二正电原边绕组40与第二走线7012及第四走线7021连接，第二正电原边绕组40与第二正极输出端903及第二升压单元402电性连接，第二正电原边绕组40用于传输第二差模电流I2及第二共模电流I2a，第二差模电流I2及第二共模电流I2a自第二正极输出端903经第二接线端子602及第二正电原边绕组40输送至第二升压单元402。可以理解，第二正电原边绕组40与第二光伏模块900a的第二正极输出端903及功率变换电路100b的升压模块400电性连接。在其他一些实施例中，第二正电原边绕组40也可以与更多个第二光伏模块900a的第二正极输出端903电性连接，例如两个、三个、四个等。
负电原边绕组50与第三走线7013及第六走线7023连接，负电原边绕组50与第一负极输出端902、第二负极输出端904、第一升压单元401及第二升压单元402电性连接，负电原边绕组50用于传输第三差模电流I3及第三共模电流I3a，第三差模电流I3自第一升压单元401及第二升压单元402经负电原边绕组50输送至第三接线端子603；第三共模电流I3a自第三接线端子603经负电原边绕组50输送至第一升压单元401及第二升压单元402。可以理解，负电原边绕组50与第一光伏模块900的第一负极输出端902、第二光伏模块900a的第二负极输出端904及功率变换电路100b的升压模块400电性连接。
第一副边绕组60与两个检测走线7071连接，第一副边绕组60与检测模块100a电性连接，第一副边绕组60用于根据传输在第一正电原边绕组30、第二正电原边绕组40及负电原边绕组50中的电流耦合输出第一感应电流I4，具体是根据磁通和输出第一感应电流I4。第二副边绕组70与两个自测走线7072连接，第二副边绕组70与检测模块100a电性连接，第二副边绕组70用于根据传输在第一正电原边绕组30、第二正电原边绕组40及负电原边绕组50中的电流耦合输出第二感应电流I5，具体是根据磁通和输出第二感应电流I5。需要说明的是，所述磁通和为第一差模电流I1、第二差模电流I2、第三差模电流I3、第一共模电流I1a、第二共模电流I2a及第三共模电流I3a在磁性结构20产生的磁通之和。
可以理解，第一正电原边绕组30的数量为一个，第二正电原边绕组40的数量为一个。在其他一些实施例中，第一正电原边绕组30及第二正电原边绕组40的数量可以是更多个，例如两个、三个、四个、五个等，例如每个第一正电原边绕组30可分别与一个第一光伏模块900的第一正极输出端901电性连接，每个第二正电原边绕组40可分别与一个第二光伏模块900a的第二正极输出端903电性连接。副边绕组的数量为两个，分别为第一副边绕组60及第二副边绕组70。在其他一些实施例中，副边绕组的数量可以是一个或者更多个，例如三个、四个、五个等，本申请对副边绕组的数量不作具体限定。
请参阅图3及图4，图4是图3所示电流互感器500中固定件10的立体结构示意图，
示例性的，固定件10为矩形板体。为便于下文描述，将固定件10的长度方向定义为第一方向(图示X轴方向)，固定件10的宽度方向定义为第二方向(图示Y轴方向)，固定件10的厚度方向定义为第三方向(图示Z轴方向)。其中，固定件10采用绝缘材质制成，例如塑料、塑胶、环氧树脂等。在其他一些实施例中，固定件10也可为圆形板体或三角形板体等异形板体，本申请对此不作限定。
固定件10设有多个通孔。沿Z轴方向上，每一个通孔均贯穿固定件10。一些实施例中，多个通孔包括第一通孔11、第二通孔12、第三通孔13、第四通孔14、第五通孔15、第六通孔16、第七通孔17、第八通孔18、第九通孔19以及第十通孔19a。其中，第一通孔11、第二通孔12、第三通孔13、第四通孔14、第五通孔15以及第六通孔16为矩形孔，第七通孔17、第八通孔18、第九通孔19以及第十通孔19a为圆形孔。
第一通孔11与第二通孔12的面积相等。第三通孔13与第四通孔14的面积相等，且与第一通孔11及第二通孔12的面积相等。在其他一些实施例中，也可不相等。第五通孔15与第六通孔16的面积相等且均与第一通孔11的面积及第三通孔13的面积的之和相等。第七通孔17与第八通孔18的面积相等，第九通孔19与第十通孔19a的面积相等，且与第七通孔17及第八通孔18的面积相等。在其他一些实施例中，也可不相等。需要说明的是，上述相等也可允许存在一定的公差范围。
沿X轴方向上，第一通孔11、第三通孔13及第六通孔16依次间隔排布，第三通孔13位于第一通孔11与第六通孔16之间。沿Y轴方向上，第二通孔12与第一通孔11间隔并错位设置，且位于第六通孔16的一侧。
需要说明的是，沿Y轴方向上，特征A与特征B错位设置指的是特征A与特征B在X-Z平面上的投影不重叠。沿X轴方向上，特征A与特征B错位设置指的是特征A与特征B在Y-Z平面上的投影不重叠。沿Z轴方向上，特征A与特征B错位设置指的是特征A与特征B在X-Y平面上的投影不重叠。后文关于错位设置的描述可作同样理解，不再赘述。
沿Y轴方向上，第四通孔14与第三通孔13间隔并错位设置；且沿X轴方向上，第四通孔14位于第三通孔13与第六通孔16之间，并位于第二通孔12朝向第三通孔13的一侧，且与第二通孔12间隔设置。其中，沿Y轴方向上，第四通孔14及第三通孔13的间距与第二通孔12及第一通孔11的间距相等。在其他一些实施例中，也可不相等。
沿Y轴方向上，第五通孔15与第六通孔16间隔并错位设置，且位于第一通孔11的一侧；且沿X轴方向上，第五通孔15位于第三通孔13朝向第一通孔11的一侧，并位于第四通孔14背向第二通孔12的一侧，且与第四通孔14间隔设置。其中，沿Y轴方向上，第五通孔15及第六通孔16的间距、第一通孔11及第二通孔12的间距以及第三通孔13与第四通孔14的间距相等。在其他一些实施例中，也可不相等。
沿X轴方向上，第九通孔19、第十通孔19a、第七通孔17及第八通孔18依次间隔排列 于第五通孔15与第四通孔14之间。其中，第九通孔19与第五通孔15间隔，第八通孔18位于第九通孔19背向第五通孔15的一侧，第八通孔18与第四通孔14间隔设置。
请参阅图3、图5及图6，图5是图3所示电流互感器500中磁性结构20的立体结构示意图，图6是图3所示电流互感器500中磁性结构20与固定件10在另一角度的结构示意图。
磁性结构20与固定件10固定连接。一些实施例中，磁性结构20固定层叠于固定件10的一个表面上。其中，磁性结构20采用胶接、焊接等方式与固定件10固定连接，本申请对此不作具体限定。示例性的，磁性结构20为矩形框体。其中，磁性结构20采用软磁材料制成，软磁材料包括但不限于软铁、软磁合金、铁氧体材料、钢硅片等，本申请对此不作具体限定。在其他一些实施例中，磁性结构20也可为环状框体、菱形框体等各种形状的框体。本实施例中，磁性结构20的高度方向与Z轴方向平行，磁性结构20的长度方向与X轴方向平行，磁性结构20的宽度方向与Y轴方向平行。
磁性结构20包括第一磁芯21及第二磁芯22，第一磁芯21与第二磁芯22相对设置，第一磁芯21与第二磁芯22合围形成穿行通道23，第一磁芯21与第二磁芯22间隔并具有气隙24。在其他一些实施例中，第一磁芯21与第二磁芯22也可一体成型，以增强磁性结构20整体的强度，即气隙24可省略。本实施例的第一磁芯21及第二磁芯22为大致U形块体结构。
也可以理解，磁性结构20具有穿行通道23，穿行通道23沿磁性结构20的厚度方向延伸。其中，磁性结构20设有气隙24，气隙24的数量为两个(分别为第一气隙241及第二气隙242)，气隙24连通穿行通道23。气隙24的设计，有效减小了磁性结构20的磁导率，有效增大了磁性结构20的饱和磁化强度，避免磁性结构20在工作过程中出现磁饱和现象，且结构简单，便于设计。
一些实施例中，第一磁芯21包括第一磁体211、第二磁体212及第三磁体213，第一磁体211与第二磁体212平行相对设置，且第一磁体211与第二磁体212均位于第三磁体213的一侧，并均与第三磁体213连接。其中，第三磁体213与第一磁体211及第二磁体212均垂直设置，第三磁体213的一端部与第一磁体211的一端部连接，另一端部与第二磁体212的一端部连接。这样设置的第一磁芯21结构稳定且强度大。需要说明的是，特征A与特征B垂直设置指的是特征A的几何中心线与特征B的几何中心线垂直(也可允许存在一定的公差范围)，后文关于垂直设置的描述可参照上述，不再赘述。特征A与特征B平行相对设置指的是特征A的几何中心线与特征B的几何中心线平行(也可允许存在一定的公差范围)，且特征A与特征B间隔，后文关于平行相对设置的描述可参照上述，不再赘述。
第二磁芯22包括第四磁体221、第五磁体222以及第六磁体223。第四磁体221与第五磁体222平行相对设置，且第四磁体221与第五磁体222均位于第六磁体223的一侧，并与第六磁体223连接。其中，第六磁体223与第四磁体221及第五磁体222均垂直设置，第六磁体223的一端部与第四磁体221的一端部连接，另一端与第五磁体222的一端部连接。这样设置的第二磁芯22结构稳定且强度大。
第一磁芯21固定层叠于固定件10上。具体的，第二磁体212固定层叠于固定件10的一个表面上，第二磁体212的长度方向及第一磁体211的长度方向平行于X轴方向，第三磁体213的长度方向平行于Z轴方向。其中，沿Y轴方向上，第一通孔11与第三通孔13位于第二磁体212的一侧，第五通孔15、第九通孔19、第十通孔19a、第七通孔17位于第二磁体212的另一侧。沿X轴方向上，第八通孔18位于第二磁体212背向第三磁体213的一端。
第二磁芯22固定层叠于固定件10上，并与第一磁芯21间隔相对。具体的，第五磁体222固定层叠于固定件10的一个表面上，并与第二磁体212间隔相对。第五磁体222的长度 方向及第四磁体221的长度方向平行于X轴方向，第六磁体223的长度方向平行于Z轴方向。其中，沿Y轴方向上，第六通孔16位于第五磁体222的一侧，第八通孔18、第四通孔14及第二通孔12位于第五磁体222的另一侧。沿X轴方向上，第二磁体212位于第五磁体222背向第六磁体223一端，且与第二磁体212间隔并具有所述第二气隙242。第四磁体221与第一磁体211间隔并具有所述第一气隙241。第二磁芯22与第一磁芯21合围形成所述穿行通道23，穿行通道23沿Y轴方向延伸。
其中，沿X轴方向上，第一气隙241的长度与第二气隙242的长度相等。在其他一些实施例中，第一气隙241的长度与第二气隙242的长度也可不相等。需要说明的是，特征A与特征B间隔并具有气隙，则所述气隙的长度指的是特征A与特征B的间距。
这样，通过改变第一磁芯21与第二磁芯22在固定件10上的相对位置，就可改变第一气隙241与第二气隙242的长度，进而改变磁性结构20的磁导率及饱和磁化强度，便于根据需要调整磁性结构20的磁导率及饱和磁化强度的大小，以避免磁性结构20在工作过程中出现磁饱和现象。具体的，第一气隙241的长度与第二气隙242的长度越大，即第一磁芯21与第二磁芯22在X轴方向上的间距越大，则磁性结构20的磁导率越小，饱和磁化强度越大，越不容易出现磁饱和现象。这样，不仅调整难度低，而且可避免对第一磁芯21及第二磁芯22进行多次加工，有利于节省加工成本。在其他一些实施例中，气隙24的数量也可是一个或者更多个，例如三个、四个、五个等，气隙24可以设置在磁性结构20的任一位置上，即本申请对气隙24的数量及位置均不作具体限定。
请参阅图3、图6及图7，图7是图3所示电流互感器500中第一正电原边绕组30的立体结构示意图。
第一正电原边绕组30穿过磁性结构20。第一正电原边绕组30穿装于固定件10中。一些实施例中，第一正电原边绕组30穿过穿行通道23。第一正电原边绕组30的两个端部分别穿装于第一通孔11及第二通孔12中。且第一正电原边绕组30的一端部位于磁性结构20的一侧，另一端部位于磁性结构20的另一侧。示例性的，第一正电原边绕组30为金属条，具体是一种铜条。在其他一些实施例中，第一正电原边绕组30也可采用铝、银等其他具有导电性的金属或其他材料制成，本申请对此不作具体限定。
一些实施例中，第一正电原边绕组30包括第一连接部31、第二连接部32及第三连接部33。第二连接部32与第三连接部33平行相对设置且位于第一连接部31的相对两侧，第二连接部32与第三连接部33分别与第一连接部31的相对两端部连接。也即是说，沿第一连接部31的延伸方向上，第二连接部32与第三连接部33错位设置。需要说明的是，本申请中，沿某一方向上，特征A与特征B错位设置，指的是特征A在与该方向垂直的平面上的投影、特征B在与该方向垂直的平面上的投影不重叠。
第二连接部32包括第一部321及第二部322，第一部321包括第一端部3211，第一部321背向第一端部3211的端部与第二部322的一端部连接，且第一部321与第二部322垂直设置。其中，第二部322背向第一部321的端部与第一连接部31的一端部连接，第一连接部31与第一部321及第二部322均垂直设置。可以理解，第二连接部32背向第一连接部31的端部即为第一端部3211。其中，第一端部3211的截面形状为矩形，第一端部3211的截面面积与第一通孔11的面积相等。所述相等允许存在一定的公差范围。
第三连接部33包括第三部331及第四部332，第三部331包括第二端部3311，第三部331背向第二端部3311的端部与第四部332的一端部连接，且第三部331与第四部332垂直设置。其中，第三部331与第四部332均位于第一连接部31背向第二部322的一侧，第四部 332背向第三部331的端部与第一连接部31的另一端部连接，第一连接部31与第三部331及第四部332均垂直设置。可以理解，第三连接部33背向第一连接部31的端部即为第二端部3311。
其中，第二端部3311的截面形状为矩形，第二端部3311的截面面积与第一端部3211的截面面积相等(也可允许存在一定的公差范围)。在其他一些实施例中，也可以不相等。第二端部3311的截面面积与第二通孔12的面积相等。需要说明的是，特征A的截面面积指的是特征A在X-Y平面上的投影面积，后文关于截面面积的说明可参照上述，不再赘述。
第一连接部31穿过磁性结构20，第二连接部32位于磁性结构20的一侧并穿装于固定件10中，第三连接部33位于磁性结构20的另一侧并穿装于固定件10中，也即是说第二连接部32与第三连接部33位于磁性结构20的相对两侧。具体的，第一连接部31穿过穿行通道23，第一连接部31的长度方向平行于Y轴方向。换言之，第一连接部31沿穿行通道23的延伸方向延伸。
第一部321与第二部322位于磁性结构20的一侧，第二部322的长度方向平行于X轴方向。第一部321的长度方向平行于Z轴方向，第一部321通过胶接、焊接或者过盈配合等方式穿装于固定件10的第一通孔11中，第一端部3211位于固定件10背向磁性结构20的一侧。可以理解，第二连接部32沿磁性结构20的高度方向延伸。
第三部331与第四部332位于磁性结构20的另一侧，第四部332的长度方向平行于X轴方向。第三部331的长度方向平行于Z轴方向，第三部331通过胶接、焊接或者过盈配合等方式穿装于固定件10的第二通孔12中，第二端部3311位于固定件10背向磁性结构20的一侧。可以理解，第三连接部33沿磁性结构20的高度方向延伸。沿穿行通道23的延伸方向上，第一端部3211与第二端部3311位于第一连接部31的相对两端。
可以理解，第一正电原边绕组30包括第一端部3211及第二端部3311，第一正电原边绕组30穿过穿行通道23，并穿装于固定件10中，第一端部3211与第二端部3311位于磁性结构20的相对两侧，且均位于固定件10背向磁性结构20的一侧。
请参阅图2、图3及图8，图8是图3所示电流互感器500与电路板700配合后沿A-A线剖切的部分结构示意图。
第一正电原边绕组30与电路板700连接。具体的，第一正电原边绕组30的第一端部3211与第一走线7011连接，第二端部3311与第五走线7022连接。其中，第一端部3211及第二端部3311通过包括但不限于焊接的方式分别与第一走线7011及第五走线7022连接。示例性的，电路板700在第一走线7011及第五走线7022的端部设有第一插接孔(图未示)及第二插接孔，每个插接孔的孔壁镀有金属层，第一端部3211与第二端部3311分别插入并焊接于第一插接孔及第二插接孔中。由此，第一端部3211与第一走线7011电性连接且固定连接，第二端部3311与第五走线7022电性连接且固定连接。换言之，电路板700与第一端部3211及第二端部3311固定连接且电性连接。
可以理解，第一端部3211与第一光伏模块900的第一正极输出端901电性连接，第二端部3311与第一升压单元401电性连接，即与升压模块400及逆变模块300电性连接，也即与功率变换电路100b(如图1所示)电性连接。第一差模电流I1经第一走线7011自第一端部3211输送至第一正电原边绕组30；接着，沿第一正电原边绕组30的第一连接部31穿过磁性结构20的穿行通道23后，自第二端部3311输送至第五走线7022，再沿第五走线7022输送至第一升压单元401。
其中，第一共模电流I1a经第一走线7011自第一端部3211输送至第一正电原边绕组30； 接着，沿第一正电原边绕组30的第一连接部31穿过磁性结构20的穿行通道23后，自第二端部3311输送至第五走线7022。可以理解，第一正电原边绕组30用于传输第一差模电流I1及第一共模电流I1a，第一差模电流I1与第一共模电流I1a均自第一端部3211流向第二端部3311，二者在第一连接部31传输的方向相同。
请参阅图3、图6及图9，图9是图3所示电流互感器500中第二正电原边绕组40的立体结构示意图。
第二正电原边绕组40穿过磁性结构20。第二正电原边绕组40穿装于固定件10中，且与第一正电原边绕组30间隔。一些实施例中，第二正电原边绕组40穿过穿行通道23并与第一正电原边绕组30间隔，第二正电原边绕组40的两个端部分别穿装于第三通孔13及第四通孔14中。第二正电原边绕组40的一端部位于磁性结构20朝向第一端部3211的一侧并与第一端部3211间隔，另一端部位于磁性结构20朝向第二端部3311的一侧并与第二端部3311间隔。其中，沿Y轴方向上，第二正电原边绕组40部分被第一正电原边绕组30遮盖。示例性的，第二正电原边绕组40为金属条，具体是一种铜条。在其他一些实施例中，第二正电原边绕组40也可采用铝、银等其他具有导电性的金属或其他材料制成，本申请对此不作具体限定。
需要说明的是，沿Y轴方向上，特征A被特征B遮盖指的是特征A与特征B在X-Z平面上的投影至少部分重叠，后文关于遮盖的说明可参照上述，不再赘述。在其他一些实施例中，可以是第二正电原边绕组40不被第一正电原边绕组30遮盖，也可是第二正电原边绕组40遮盖第一正电原边绕组30，还可是第二正电原边绕组40与第一正电原边绕组30没有遮盖关系。
一些实施例中，第二正电原边绕组40包括第一固定部41、第二固定部42及第三固定部43。第二固定部42与第三固定部43平行相对设置且位于第一固定部41的相对两侧，第二固定部42与第三固定部43分别与第一固定部41的相对两端部连接。也即是说，沿第一固定部41的延伸方向上，第二固定部42与第三固定部43错位设置。
第二固定部42包括第一分部421及第二分部422，第一分部421包括第三端部4211，第一分部421背向第三端部4211的端部与第二分部422的一端部连接，且第一分部421与第二分部422垂直设置。其中，第二分部422背向第一分部421的端部与第一固定部41的一端部连接，第一固定部41与第一分部421及第二分部422均垂直设置。可以理解，第二固定部42背向第一固定部41的端部即为第三端部4211。其中，第三端部4211的截面形状为矩形，第三端部4211的截面面积与第三通孔13的面积相等。所述相等允许存在一定的公差范围。
第三固定部43包括第三分部431及第四分部432，第三分部431包括第四端部4311，第三分部431背向第四端部4311的端部与第四分部432的一端部连接，且第三分部431与第四分部432垂直设置。其中，第三分部431与第四分部432均位于第一固定部41背向第二分部422的一侧，第四分部432背向第三分部431的端部与第一固定部41的另一端部连接，第一固定部41与第三分部431及第四分部432均垂直设置。可以理解，第三固定部43背向第一固定部41的端部即为第四端部4311。
其中，第四端部4311的截面形状为矩形，第四端部4311的截面面积与第三端部4211的截面面积相等(也可允许存在一定的公差范围)。在其他一些实施例中，也可以不相等。第四端部4311的截面面积与第四通孔14的面积相等。
第一固定部41穿过磁性结构20，并与第一连接部31间隔设置，第二固定部42位于磁性结构20朝向第二连接部32的一侧，并与第二连接部32间隔设置，且穿装于固定件10中， 第三固定部43位于磁性结构20朝向第三连接部33的一侧，并与第三连接部33间隔设置，且穿装于固定件10中。具体的，第一固定部41穿过穿行通道23，第一固定部41的长度方向平行于Y轴方向。换言之，第一固定部41沿穿行通道23的延伸方向延伸。沿Z轴方向上，第一固定部41与第一连接部31间隔设置，且沿Z轴方向上，第一固定部41的投影与第一连接部31的投影重叠。
第一分部421与第二分部422均位于磁性结构20朝向第二连接部32的一侧，第二分部422的长度方向平行于X轴方向，且沿Z轴方向上，第二分部422位于第二部322的一侧，并与第二部322(如图7所示)间隔。第一分部421的长度方向平行于Z轴方向，且沿X轴方向上，第一分部421位于第一部321的一侧，并与第一部321间隔。第一分部421通过胶接、焊接或者过盈配合等方式穿装于固定件10的第三通孔13中。第三端部4211位于固定件10背向磁性结构20的一侧。且第三端部4211位于第一端部3211的一侧并与第一端部3211间隔。可以理解，第二固定部42沿磁性结构20的高度方向延伸。沿穿行通道23的延伸方向上，第三端部4211位于第一固定部41朝向第一端部3211的一端。
第三分部431与第四分部432位于磁性结构20朝向第三连接部33的一侧，第四分部432的长度方向平行于X轴方向，且沿Z轴方向上，第四分部432位于第四部332的一侧并与第四部332间隔。第三分部431的长度方向平行于Z轴方向，且沿X轴方向上，第三分部431位于第三部331的一侧并与第三部331间隔。第三分部431通过胶接、焊接或者过盈配合等方式穿装于固定件10的第四通孔14中，第四端部4311位于固定件10背向磁性结构20的一侧。且第四端部4311位于第二端部3311的一侧并与第二端部3311间隔。可以理解，第三固定部43沿磁性结构20的高度方向延伸。沿穿行通道23的延伸方向上，第四端部4311位于第一固定部41朝向第二端部3311的另一端。沿Y轴方向上(即穿行通道23的延伸方向上)，第三端部4211与第四端部4311的间距、及第一端部3211与第二端部3311的间距相等。
可以理解，第二正电原边绕组40包括第三端部4211及第四端部4311，第二正电原边绕组40穿过穿行通道23，并与第一正电原边绕组30间隔，且穿装于固定件10中。第三端部4211位于磁性结构20朝向第一端部3211的一侧，第四端部4311位于磁性结构20朝向第二端部3311的一侧。且第一端部3211、第二端部3311、第三端部4211及第四端部4311均位于固定件10背向磁性结构20的一侧。
请参阅图2、图3及图8，第二正电原边绕组40与电路板700连接。一些实施例中，第二正电原边绕组40的第三端部4211与第二走线7012连接，第四端部4311与第四走线7021连接。其中，第三端部4211及第四端部4311通过包括但不限于焊接的方式分别与第二走线7012及第四走线7021连接。示例性的，电路板700在第二走线7012及第四走线7021的端部设有第三插接孔(图未示)及第四插接孔，每个插接孔的孔壁镀有金属层，第三端部4211与第四端部4311分别插入并焊接于第三插接孔及第四插接孔中。由此，第三端部4211与第二走线7012电性连接并固定连接，第四端部4311与第四走线7021电性连接并固定连接。换言之，电路板700与第三端部4211及第四端部4311固定连接且电性连接。
可以理解，第三端部4211与第二光伏模块900a的第二正极输出端903电性连接，第四端部4311与第二升压单元402电性连接，即与升压模块400及逆变模块300电性连接，也即与功率变换电路100b(如图1所示)电性连接。第二差模电流I2经第二走线7012自第三端部4211输送至第二正电原边绕组40；接着，沿第二正电原边绕组40的第一固定部41穿过磁性结构20的穿行通道23后，自第四端部4311输送至第四走线7021，再沿第四走线7021输送至第二升压单元402。
其中，第二共模电流I2a经第二走线7012自第三端部4211输送至第二正电原边绕组40；接着，沿第二正电原边绕组40的第一固定部41穿过磁性结构20的穿行通道23后，自第四端部4311输送至第四走线7021。可以理解，第二正电原边绕组40用于传输第二差模电流I2及第二共模电流I2a，第二差模电流I2及第二共模电流I2a均自第三端部4211流向第四端部4311，二者在第一固定部41传输的方向相同。
请参阅图3、图6及图10，图10是图3所示电流互感器500中负电原边绕组50的立体结构示意图。
负电原边绕组50穿过磁性结构20。负电原边绕组50穿装于固定件10中，且与第一正电原边绕组30及第二正电原边绕组40间隔。一些实施例中，负电原边绕组50穿过穿行通道23并与第一正电原边绕组30及第二正电原边绕组40间隔。负电原边绕组50的两个端部分别穿装于第五通孔15及第六通孔16中。负电原边绕组50的一端部位于磁性结构20朝向第一端部3211及第三端部4211的一侧，并与第一端部3211及第三端部4211间隔；另一端部位于磁性结构20朝向第二端部3311及第四端部4311的一侧，并与第二端部3311及第四端部4311间隔。其中，沿Y轴方向上，负电原边绕组50位于第一正电原边绕组30与第二正电原边绕组40之间。负电原边绕组50遮盖部分第二正电原边绕组40，且部分被第一正电原边绕组30遮盖。示例性的，负电原边绕组50为金属条，具体是一种铜条。在其他一些实施例中，负电原边绕组50也可采用铝、银等其他具有导电性的金属或者其他材料制成，本申请对此不作具体限定。
在其他一些实施例中，沿Y轴方向上，负电原边绕组50位于第一正电原边绕组30远离第二正电原边绕组40的一侧，也可是负电原边绕组50位于第二正电原边绕组40远离第一正电原边绕组30的一侧。
一些实施例中，负电原边绕组50包括第一导电部51、第二导电部52及第三导电部53。第二导电部52与第三导电部53平行相对设置，且位于第一导电部51的相对两侧，第二导电部52与第三导电部53分别与第一导电部51的相对两端部连接。
第二导电部52包括第一支部521及第二支部522，第一支部521包括第五端部5211，第一支部521背向第五端部5211的端部与第二支部522的一端部连接，且第一支部521与第二支部522垂直设置。其中，第二支部522背向第一支部521的端部与第一导电部51的一端部连接，第一导电部51与第一支部521及第二支部522均垂直设置。可以理解，第二导电部52背向第一导电部51的端部即为第五端部5211。其中，第五端部5211的截面形状为矩形，第五端部5211的截面面积与第五通孔15的面积相等。所述相等允许存在一定的公差范围。
第三导电部53包括第三支部531及第四支部532，第三支部531包括第六端部5311，第三支部531背向第六端部5311的端部与第四支部532的一端部连接，且第三支部531与第四支部532垂直设置。其中，第三支部531与第四支部532均位于第一导电部51背向第二支部522的一侧，第四支部532背向第三支部531的端部与第一导电部51的另一端部连接，第一导电部51与第三支部531及第四支部532均垂直设置。可以理解，第三导电部53背向第一导电部51的端部即为第六端部5311。
第一导电部51穿过磁性结构20，并与第一连接部31及第一固定部41间隔设置，第二导电部52位于磁性结构20朝向第三连接部33及第三固定部43的一侧，并与第三连接部33及第三固定部43间隔设置，且穿装于固定件10中。第三导电部53位于磁性结构20朝向第二连接部32及第二固定部42的一侧，并与第二连接部32及第二固定部42间隔设置，且穿装于固定件10中。具体的，第一导电部51穿过穿行通道23，第一导电部51的长度方向平 行于Y轴方向。换言之，第一导电部51沿穿行通道23的延伸方向延伸。沿Z轴方向上，第一导电部51位于第一连接部31及第一固定部41，并与第一连接部31及第一固定部41间隔。也即是说，第一连接部31、第一固定部41及第一导电部51均穿过穿行通道23并间隔设置，第一导电部51位于第一连接部31及第一固定部41之间。且沿Z轴方向(即磁性结构20的高度方向)上，第一导电部51的投影、第一连接部31的投影、以及第一固定部41的投影重叠。
可以理解，在磁性结构20的高度方向上(即在与穿行通道23的延伸方向垂直的方向上)，负电原边绕组50的投影、第一正电原边绕组30的投影及第二正电原边绕组40均重叠。这样，有利于提高第一正电原边绕组30、第二正电原边绕组40以及负电原边绕组50在穿行通道23中的空间利用率，有利于减小电流互感器500的占板面积，便于电流互感器500的小型化设计。
第一支部521与第二支部522均位于磁性结构20朝向第三连接部33及第三固定部43的一侧，第二支部522的长度方向平行于X轴方向，且沿Z轴方向上，第二支部522位于第四部332(如图7所示)及第四分部432(如图9所示)之间，并与第四部332及第四分部432间隔。第一支部521的长度方向平行于Z轴方向，且沿X轴方向上，第一支部521位于第三分部431背向第三部331的一侧，并与第三分部431间隔。第一支部521通过胶接、焊接或者过盈配合等方式穿装于固定件10的第五通孔15中。第五端部5211位于固定件10背向磁性结构20的一侧。且沿X轴方向(即第一方向)上，第五端部5211位于第四端部4311背向第二端部3311的一侧并与第四端部4311间隔。可以理解，第二导电部52沿磁性结构20的高度方向延伸。沿穿行通道23的延伸方向上，第五端部5211位于第一导电部51朝向第二端部3311及第四端部4311的一端。
第三支部531与第四支部532均位于磁性结构20朝向第二连接部32及第二固定部42的一侧，第四支部532的长度方向平行于X轴方向，且沿Z轴方向上，第四支部532位于第二部322及第二分部422之间，并与第二部322及第二分部422间隔。第三支部531的长度方向平行于Z轴方向，且沿X轴方向上，第三支部531位于第一分部421背向第一部321的一侧，并与第一分部421间隔。第三支部531通过胶接、焊接或者过盈配合等方式穿装于固定件10的第六通孔16中。第六端部5311位于固定件10背向磁性结构20的一侧。且沿X轴方向(即第一方向)上，第六端部5311位于第三端部4211背向第一端部3211的一侧并与第三端部4211间隔。可以理解，第三导电部53沿磁性结构20的高度方向延伸。沿穿行通道23的延伸方向上，第六端部5311位于第一导电部51朝向第一端部3211及第三端部4211的另一端。
其中，沿Y轴方向上(即穿行通道23的延伸方向上)，第三端部4211与第四端部4311的间距、第一端部3211与第二端部3311的间距、及第五端部5211及第六端部5311的间距相等。这样，有利于减小电流互感器500在穿行通道23的延伸方向上的尺寸，有利于减小电流互感器500的占板面积，便于电流互感器500的小型化设计。
可以理解，负电原边绕组50穿过穿行通道23，并与第一正电原边绕组30及第二正电原边绕组40间隔，且穿装于固定件10中。第五端部5211位于磁性结构20朝向第四端部4311的一侧，第六端部5311位于磁性结构20朝向第三端部4211的一侧。也即是说第一端部3211、第三端部4211及第六端部5311位于磁性结构20的一侧，第五端部5211、第四端部4311及第二端部3311位于磁性结构20的另一侧。
也即是说，第一正电原边绕组30、第二正电原边绕组40及负电原边绕组50穿装于固定 件10中，第一端部3211、第二端部3311、第三端部4211、第四端部4311、第五端部5211以及第六端部5311均位于固定件10背向磁性结构20的一侧。这样，磁性结构20、第一正电原边绕组30、第二正电原边绕组40以及负电原边绕组50通过固定件10组装在一起，结构简单且稳定，有利于提高电流互感器500的整体结构稳定性。而且，第一端部3211、第二端部3311、第三端部4211、第四端部4311、第五端部5211以及第六端部5311位于固定件10背向磁性结构20的一侧的设计，便于电流互感器500与电路板700安装，降低了装配难度。
请参阅图2、图3及图8，负电原边绕组50与电路板700连接。一些实施例中，负电原边绕组50的第五端部5211与第三走线7013连接，第六端部5311与第六走线7023连接。其中，第五端部5211及第六端部5311通过包括但不限于焊接的方式分别与第三走线7013及第六走线7023连接。示例性的，电路板700在第三走线7013及第六走线7023的端部设有第五插接孔(图未示)及第六插接孔，每个插接孔的孔壁镀有金属层，第五端部5211与第六端部5311分别插入并焊接于第五插接孔及第六插接孔中。由此，第五端部5211与第三走线7013电性连接且固定连接，第六端部5311与第六走线7023电性连接且固定连接。换言之，电路板700与第五端部5211及第六端部5311固定连接且电性连接。
可以理解，第五端部5211与第一光伏模块900的第一负极输出端902及第二光伏模块900a的第二负极输出端904电性连接，第六端部5311与第一升压单元401及第二升压单元402电性连接，即第六端部5311与升压模块400及逆变模块300电性连接，也即与功率变换电路100b(如图1所示)电性连接。第三差模电流I3(即第一差模电流I1与第二差模电流I2的合路电流)，经第六走线7023自第六端部5311输送至负电原边绕组50；接着，沿负电原边绕组50的第一导电部51穿过磁性结构20的穿行通道23后，自第五端部5211输送至第三走线7013。
其中，第三共模电流I3a(第一共模电流I1a与第二共模电流I2a的合路电流)经第三走线7013自第五端部5211输送至负电原边绕组50；接着，沿负电原边绕组50的第一导电部51穿过磁性结构20的穿行通道23后，自第六端部5311输送至第六走线7023。可以理解，负电原边绕组50用于传输第三差模电流I3及第三共模电流I3a，第三差模电流I3自第六端部5311流向第五端部5211。第三共模电流I3a自第五端部5211流向第六端部5311。二者在第一导电部51传输的方向相反。
如图3所示，第一端部3211与第二端部3311均位于第五端部5211靠近第六端部5311的一侧，第三端部4211与第四端部4311均位于第六端部5311靠近第五端部5211的一侧。具体的，在第一方向(即X轴方向)上，第三端部4211与第四端部4311均位于第五端部5211与第六端部5311之间，第一端部3211位于第三端部4211背向第六端部5311的一侧，第二端部3311位于第四端部4311背向第五端部5211的一侧。这样，根据这样设计的电流互感器500布线的电路板700，可避免设置在其上与各个绕组的端部连接的多个走线发生交叉，避免板上走线困难的问题，有利于在电路板700上设置走线，降低了布线困难，减少了布线的设计成本；而且，在避免走线交叉的同时，提高了电流互感器500的空间利用率，有利于减小电流互感器500的占板面积，有利于电流互感器500的小型化设计。
请参阅图11及图12，图11是图3所示电流互感器500(省略固定件10、第一副边绕组60及第二副边绕组70)的立体结构示意图，图12是图11所示电流互感器500的磁性结构20被第一差模电流I1、第二差模电流I2及第三差模电流I3穿过产生磁通的方向示意图。磁通是一个标量，本申请中，磁通的正负向与经过磁性结构20的横截面的磁场方向有关，其中， 磁场的方向为磁通的正向。
第一差模电流I1沿第一正电原边绕组30的第一连接部31穿过磁性结构20的穿行通道23，第一差模电流I1产生第一磁场B1，第一磁场B1的磁场方向为顺时针方向。其中，第一磁场B1经过第四磁体221的横截面时，第一磁场B1在第四磁体221的磁场方向向右，第一差模电流I1在磁性结构20的第四磁体221产生的磁通(即第一磁通φ1)的正向向右。
第二差模电流I2沿第二正电原边绕组40的第一固定部41穿过磁性结构20的穿行通道23，第二差模电流I2产生第二磁场B2，第二磁场B2的方向为顺时针方向。其中，第二磁场B2经过第四磁体221的横截面时，第二磁场B2在第四磁体221的磁场方向向右，第二差模电流I2在磁性结构20的第四磁体221产生的磁通(即第二磁通φ2)的正向向右。可以理解，由于第一差模电流I1的值与第二差模电流I2的值相等，第二磁通φ2与第一磁通φ1相等。
第三差模电流I3沿负电原边绕组50的第一导电部51穿过磁性结构20的穿行通道23，第三差模电流I3产生第三磁场B3。第三磁场B3的方向为顺时针方向。其中，第三磁场B3经过第四磁体221的横截面时，第三磁场B3在第四磁体221的磁场方向向右，第三差模电流I3在磁性结构20的第四磁体221产生的磁通(即第三磁通φ3)的正向向右。可以理解，由于第三差模电流I3的值与第一差模电流I1的值及第二差模电流I2的值之和相等，第三磁通φ3与第一磁通φ1及第二磁通φ2的和相等。
由于第一磁通φ1、第二磁通φ2及第三磁通φ3的正向方向相同，第一磁通φ1、第二磁通φ2及第三磁通φ3相叠加；换言之，第一差模电流I1、第二差模电流I2及第三差模电流I3在磁性结构20的第四磁体221产生的磁通为6φ1，也为6φ2，还为2φ3。可以理解，第一差模电流I1、第二差模电流I2及第三差模电流I3在磁性结构20同一位置处产生的磁通均会相互叠加。
请参阅图11及图13，图13是图11所示电流互感器500的磁性结构20被第一共模电流I1a、第二共模电流I2a及第三共模电流I3a穿过产生的磁通的方向示意图。
第一共模电流I1a沿第一正电原边绕组30的第一连接部31穿过磁性结构20的穿行通道23，第一共模电流I1a产生第一共模磁场B4，第一共模磁场B4的磁场方向为顺时针方向。其中，第一共模磁场B4经过第四磁体221的横截面时，第一共模磁场B4在第四磁体221的磁场方向向右，第一共模电流I1a在磁性结构20的第四磁体221产生的磁通(即第一共模磁通φ4)的正向向右。
第二共模电流I2a沿第二正电原边绕组40的第一固定部41穿过磁性结构20的穿行通道23，第二共模电流I2a产生第二共模磁场B5，第二共模磁场B5的方向为顺时针方向。其中，第二共模磁场B5经过第四磁体221的横截面时，第二共模磁场B5在第四磁体221的磁场方向向右，第二共模电流I2a在磁性结构20的第四磁体221产生的磁通(即第二共模磁通φ5)的正向向右。可以理解，由于第一共模电流I1a的值与第二共模电流I2a的值相等，第二共模磁通φ5与第一共模磁通φ4相等。
第三共模电流I3a沿负电原边绕组50的第一导电部51穿过磁性结构20的穿行通道23，第三共模电流I3a产生第三共模磁场B6。第三共模磁场B6的方向为逆时针方向。其中，第三共模磁场B6经过第四磁体221的横截面时，第三共模磁场B6在第四磁体221的磁场方向向左，第三共模电流I3a在磁性结构20的第二磁体212产生的磁通(即第三共模磁通φ6)的正向向左。可以理解，由于第三共模电流I3a为第一共模电流I1a及第二共模电流I2a的合路电流，第三共模电流I3a的值与第一共模电流I1a的值及第二共模电流I2a的值之和相等，第三共模磁通φ6与第一共模磁通φ4及第二共模磁通φ5的和相等。由此，第三共模磁通φ 6与第一共模磁通φ4及第二共模磁通φ5相抵消。可以理解，第一共模电流I1a、第二共模电流I2a及第三共模电流I3a在磁性结构20同一位置处产生的磁通均会相互抵消。
请参阅图2、图3、图12及图13，当电流互感器500应用在光伏发电系统1000中时，光伏模块(包括第一光伏模块900及第二光伏模块900a)输出的多路电流流经光伏变换器800a的电流互感器500后，第一差模电流I1、第二差模电流I2及第三差模电流I3在磁性结构20产生的磁通相互叠加，第一共模电流I1a、第二共模电流I2a及第三共模电流I3a产生的磁通相互抵消。由此，磁性结构20产生的磁通主要为差模电流产生的磁通，后续第一副边绕组60及第二副边绕组70产生的第一感应电流I4及第二感应电流I5为差模电流对应的感应电流，达到抑制共模电流的效果。由于拉弧信号为差模电流信号，这样减小了共模电流带来的噪声影响，实现了对差模电流的独立测量，有利于后续检测模块100a对拉弧信号的检测，有利于提高拉弧检测的精度及速度。由于第一连接部31、第一固定部41及第一导电部51均沿穿行通道23的延伸方向延伸，各个差模电流及各个共模电流均能垂直穿过磁性结构20。这样，共模电流与差模电流在磁性结构20产生的磁通会更大，便于后续第一副边绕组60及第二副边绕组70输出第一感应电流I4及第二感应电流I5。
另外，由于第一正电原边绕组30的第一连接部31、第二正电原边绕组40的第一固定部41以及负电原边绕组50的第一导电部51均穿过磁性结构20的穿行通道23，这使得传输在三个原边绕组上的共模电流(即第一共模电流I1a、第二共模电流I2a及第三共模电流I3a)所产生的磁通具有相同的磁路，更有利于抑制共模电流带来的噪声影响，提高了电流互感器500对共模噪声的抑制能力，更有利于后续对拉弧信号的检测。且由于第一导电部51位于第一连接部31及第一固定部41之间，有利于在第一连接部31及第一固定部41传输的共模电流所产生的磁通之和(第一共模电流I1a与第二共模电流I2a所产生的磁通之和)与在第一导电部51传输的共模电流所产生的磁通(第三共模电流I3a所产生的磁通)相抵消，进一步提高了电流互感器500对共模噪声的抑制能力，更有利于后续对拉弧信号的检测。
通过本申请提供的电流互感器500，可对光伏模块(包括第一光伏模块900及第二光伏模块900a)输出的多路电流中进行一次拉弧信号采集，从而可对多路电流中的拉弧信号进行一次检测，避免对每一路电流分别进行拉弧信号采集，进而避免对多路电流中的拉弧信号进行多次检测。电流互感器500的设计，不仅有利于提高拉弧信号的采集效率，而且结构简单，有利于减少检测成本。
请参阅图3、图6及图8，第一副边绕组60绕制在磁性结构20上，并穿装于固定件10中。一些实施例中，第一副边绕组60绕制在磁性结构20的第四磁体221上。在其他一些实施例中，第一副边绕组60也可绕制在包括但不限于第一磁体211、第二磁体212、第三磁体213、第五磁体222或第六磁体223上，本申请对第一副边绕组60的位置不作具体限定。
其中，第一副边绕组60为由第一导电线绕制而成的线圈。示例性的，第一导电线为铜线。在其他一些实施例中，第一导电线也可采用银、铝等其他具有导电性的金属材料或其他材料制成。第一副边绕组60包括第一输出端61及第二输出端62，第一输出端61通过焊接、胶接或者过盈配合等方式穿装于固定件10的第七通孔17中，第二输出端62通过焊接、胶接或者过盈配合等方式穿装于固定件10的第八通孔18中。其中，第一输出端61与第二输出端62均至少位于固定件10背向磁性结构20的一侧。第一输出端61及第二输出端62均位于磁性结构20朝向第五端部5211、第四端部4311及第二端部3311的一侧，且第一输出端61位于第四端部4311与第五端部5211之间，并与第四端部4311及第五端部5211间隔。第二输出端62位于第一输出端61与第四端部4311之间，并与第一输出端61及第四端部4311间隔。 第一副边绕组60与电路板700连接。一些实施例中，第一副边绕组60的第一输出端61与第二输出端62分别与两个检测走线7071连接。其中，第一输出端61与第二输出端62通过包括但不限于焊接的方式分别与两个检测走线7071连接。示例性的，电路板700在两个检测走线7071的端部分别设有第七插接孔(图未示)及第八插接孔，每个插接孔的孔壁镀有金属层，第一输出端61与第二输出端62分别插入并焊接于第七插接孔及第八插接孔中。由此，第一输出端61与第二输出端62分别与两个检测走线7071电性连接且固定连接。
可以理解，第一输出端61与第二输出端62分别与检测模块100a电性连接。根据电磁感应原理，第一副边绕组60可根据原边绕组在磁性结构20中产生的磁通和输出第一感应电流I4。第一感应电流I4通过第一输出端61及第二输出端62输出后，沿两个检测走线7071输送至检测模块100a，以便检测模块100a对第一感应电流I4中的拉弧电流信号进行检测。
需要说明的是，原边绕组在磁性结构20中产生的磁通之和指的是第一差模电流I1、第二差模电流I2、第三差模电流I3、第一共模电流I1a、第二共模电流I2a及第三共模电流I3a产生的磁通之和。在本实施例中，原边绕组在磁性结构20中产生的磁通之和即为第一磁通φ1、第二磁通φ2、第三磁通φ3、第一共模磁通φ4、第二共模磁通φ5及第三共模磁通φ6的和。由于第三共模磁通φ6与第一共模磁通φ4及第二共模磁通φ5的磁通之和相抵消，第一副边绕组60主要根据差模电流产生的磁通输出第一感应电流I4；又由于拉弧信号为差模信号，这样，有利于后续检测模块100a对第一感应电流I4中的拉弧电流信号进行检测，提高了后续拉弧检测的精确度及速度。
可以理解，第一输出端61与第二输出端62均穿装于固定件10中，且均至少部分位于固定件10背向磁性结构20的一侧的设计，有利于第一副边绕组60与电路板700连接。
第二副边绕组70绕制在磁性结构20上，并穿装于固定件10中。一些实施例中，第二副边绕组70绕制在磁性结构20的第四磁体221上，并与第一副边绕组60间隔。在其他一些实施例中，第二副边绕组70也可绕制在包括但不限于第一磁体211、第二磁体212、第三磁体213、第五磁体222或第六磁体223上，本申请对第二副边绕组70的位置不作具体限定。
其中，第二副边绕组70为由第二导电线绕制而成的线圈。示例性的，第二导电线为铜线。在其他一些实施例中，第二导电线也可采用银、铝等其他具有导电性的金属材料或其他材料制成。第二副边绕组70包括第三输出端71及第四输出端72，第三输出端71通过焊接、胶接或者过盈配合等方式穿装于固定件10的第九通孔19中，第四输出端72通过焊接、胶接或者过盈配合等方式穿装于固定件10的第十通孔19a中。其中。第三输出端71与第四输出端72均至少位于固定件10背向磁性结构20的一侧。第三输出端71及第四输出端72均位于磁性结构20朝向第五端部5211、第四端部4311及第二端部3311的一侧，且第三输出端71位于第五端部5211与第一输出端61之间，并与第五端部5211及第一输出端61间隔。第四输出端72位于第三输出端71与第一输出端61之间，并与第三输出端71及第一输出端61间隔。
第二副边绕组70与电路板700连接。一些实施例中，第二副边绕组70的第三输出端71与第四输出端72分别与两个自测走线7072连接。其中，第三输出端71与第四输出端72通过包括但不限于焊接的方式分别与两个自测走线7072连接。示例性的，电路板700在两个自测走线7072的端部分别设有第九插接孔(图未示)及第十插接孔，每个插接孔的孔壁镀有金属层，第三输出端71与第四输出端72分别插入并焊接于第九插接孔及第十插接孔中。由此，第三输出端71与第四输出端72分别与两个自测走线7072电性连接且固定连接。
可以理解，第三输出端71与第四输出端72分别与检测模块100a电性连接。根据电磁感应原理，第二副边绕组70可根据原边绕组在磁性结构20中产生的磁通和输出第二感应电流 I5。第二感应电流I5通过第三输出端71及第四输出端72输出后，沿两个自测走线7072输送至检测模块100a。检测模块100a根据第二感应电流I5输出模拟拉弧信号，以便检测模块100a的自检。需要说明的是，如上文所述，原边绕组在磁性结构20中产生的磁通主要为差模电流产生的磁通。
本实施例中，第一副边绕组60的匝数与第二副边绕组70的匝数不同，第一副边绕组60输出的第一感应电流I4与第二副边绕组70输出的第二感应电流I5的值不同。在其他一些实施例中，第一副边绕组60的匝数与第二副边绕组70的匝数也可相同，从而第一副边绕组60输出的第一感应电流I4与第二副边绕组70输出的第二感应电流I5的值相等，本申请对此不作具体限制。
可以理解，根据电磁感应原理，第一副边绕组60与第二副边绕组70可根据在各个原边绕组上传输的电流产生的磁通和分别输出一路电流。若第二副边绕组70与第一副边绕组60的匝数不同，第二副边绕组70输出的电流的大小与第一副边绕组60输出的电流的大小不同；若第二副边绕组70与第一副边绕组60的匝数相同，第二副边绕组70输出的电流的大小与第一副边绕组60输出的电流的大小相同。电流互感器500可设置匝数不同或者相同的多个副边绕组，以输出满足需求的多路相同或者不同电流。
可以理解，第三输出端71与第四输出端72均穿装于固定件10中，且均至少部分位于固定件10背向磁性结构20的一侧的设计，有利于第二副边绕组70与电路板700连接。
请参阅图1、图2及图3、图8、图12及图13，本申请中，第一光伏模块900及第二光伏模块900a输出的直流电经电流互感器500输送至功率变换电路100b，功率变换电路100b根据所述直流电输出交流电。电流互感器500可用于对光伏变换器800a的直流侧的拉弧检测。当光伏变换器800a的直流侧出现拉弧故障(例如第一光伏模块900或第二光伏模块900a因老化出现拉弧故障)时，光伏变换器800a的直流侧接收到的直流电流会存在拉弧信号(一种差模信号)，电流互感器500自上述直流电流中采集到拉弧信号，以便于后续对拉弧信号的检测。
本申请中电流互感器500通过第一正电原边绕组30、第二正电原边绕组40以及负电原边绕组50输送自光伏变换器800a的直流侧接收到的多路电流。根据电磁感应原理，第一副边绕组60根据在各个原边绕组上传输的电流耦合输出一路第一感应电流I4，拉弧信号可随第一副边绕组60输出的第一感应电流I4输送至后续器件，以便对拉弧信号进行检测。从而，通过本申请提供的电流互感器500，可对自光伏变换器800a的直流侧接收到的多路电流进行一次拉弧信号采集，从而可对多路电流中的拉弧信号进行一次检测，避免对每一路电流分别进行拉弧信号采集，进而避免对多路电流中的拉弧信号进行重复检测。电流互感器500的设计，不仅有利于提高拉弧信号的采集效率，而且结构简单，有利于减少检测成本，还有利于减少电流互感器500的数量，有利于减小占板面积，进而有利于光伏变换器800a的小型化设计。
其中，当光伏变换器800a的直流侧出现拉弧故障时，光伏变换器800a的直流侧接收到的直流电流还会存在共模噪声信号，即第一光伏模块900会输出第一差模电流I1及第一共模电流I1a，第二光伏模块900a会输出第二差模电流I2及第二共模电流I2a。第一正电原边绕组30传输第一差模电流I1及第一共模电流I1a，第一差模电流I1及第一共模电流I1a均自第一端部3211流向第二端部3311。第二正电原边绕组40传输第二差模电流I2及第二共模电流I2a，第二差模电流I2及第二共模电流I2a均自第三端部4211流向第四端部4311。负电原边绕组50传输第三差模电流I3(第一差模电流I1及第二差模电流I2的合路电流)及第三共模 电流I3a(第一共模电流I1a及第二共模电流I2a的合路电流)，第三差模电流I3自第六端部5311流向第五端部5211，第三共模电流I3a自第五端部5211流向第六端部5311。
由于第一端部3211、第三端部4211及第六端部5311位于磁性结构20的一侧，第五端部5211、第四端部4311及第二端部3311位于磁性结构20的另一侧，这样的设计使得第一差模电流I1、第二差模电流I2及第三差模电流I3穿过磁性结构20的方向相同，上述三者在磁性结构20产生的磁通相互叠加；使得第一共模电流I1a与第二共模电流I2a穿过磁性结构20的方向相同，第三共模电流I3a穿过磁性结构20的方向与上述二者相反，第一共模电流I1a及第二共模电流I2a在磁性结构20产生的磁通之和、与第三共模电流I3a在磁性结构20产生的磁通相抵消。由此，磁性结构20产生的磁通主要为差模电流产生的磁通。根据电磁感应原理，第一副边绕组60及第二副边绕组70耦合输出的第一感应电流I4及第二感应电流I5为差模电流对应的感应电流。从而达到抑制共模电流的效果，减小了共模电流带来的噪声影响，实现了对差模电流的独立测量，有利于后续对拉弧信号的检测，有利于提高后续拉弧检测的精度及速度。
此外，由于第一正电原边绕组30、第二正电原边绕组40以及负电原边绕组50均穿过磁性结构20的穿行通道23，使得第一共模电流I1a、第二共模电流I2a及第三共模电流I3a产生的磁通具有相同的磁路，更有利于抑制共模电流带来的噪声影响，更有利于后续对拉弧信号的检测。
本申请提供的电流互感器500应用在光伏变换器800a时，还可避免设置在电路板700上用于与电流互感器500连接的走线发生交叉，即避免第一走线7011、第二走线7012、第三走线7013、第四走线7021、第五走线7022、第六走线7023、检测走线7071及自测走线7072发生交叉。本申请提供的电流互感器500，避免了板上布线困难的问题，便于电路板700布线，减少在电路板700上布线的难度，降低了布线的设计成本。
请参阅图2、图14及图15，图14是本申请又一实施例提供的电流互感器500的立体结构示意图，图15是图14所示电流互感器500与电路板700配合后沿B-B线剖切的部分结构示意图。
电流互感器500包括固定件10、磁性结构20、第一正电原边绕组30、第二正电原边绕组40、负电原边绕组50、第一副边绕组60以及第二副边绕组70。磁性结构20与固定件10固定连接。第一正电原边绕组30穿过磁性结构20且不接触，第一正电原边绕组30穿过固定件10与固定件10固定连接。第二正电原边绕组40穿过磁性结构20且不接触，第二正电原边绕组40穿过固定件10与固定件10固定连接。负电原边绕组50穿过磁性结构20且不接触，负电原边绕组50穿过固定件10与固定件10固定连接。第一副边绕组60绕制在磁性结构20上。第一副边绕组60穿过固定件10与固定件10固定连接。第二副边绕组70绕制在磁性结构20上。第二副边绕组70穿过固定件10与固定件10固定连接。
其中，第一正电原边绕组30与第一走线7011及第四走线7021连接，第一正电原边绕组30与第一正极输出端901及第二升压单元402电性连接，第一正电原边绕组30用于传输第一差模电流I1及第一共模电流I1a，第一差模电流I1及第一共模电流I1a自第一正极输出端901经第一接线端子601及第一正电原边绕组30输送至第二升压单元402。
第二正电原边绕组40与第二走线7012及第五走线7022连接，第二正电原边绕组40与第二正极输出端903及第一升压单元401电性连接，第二正电原边绕组40用于传输第二差模电流I2及第二共模电流I2a，第二差模电流I2及第二共模电流I2a自第二正极输出端903经第二接线端子602及第二正电原边绕组40输送至第一升压单元401。
负电原边绕组50与第三走线7013及第六走线7023连接，负电原边绕组50与第一负极输出端902、第二负极输出端904、第一升压单元401及第二升压单元402电性连接，负电原边绕组50用于传输第三差模电流I3及第三共模电流I3a，第三差模电流I3自第一升压单元401及第二升压单元402经负电原边绕组50输送至第三接线端子603；第三共模电流I3a自第三接线端子603经负电原边绕组50输送至第一升压单元401及第二升压单元402。
第一副边绕组60与两个检测走线7071连接，第一副边绕组60与检测模块100a电性连接，第一副边绕组60用于根据传输在第一正电原边绕组30、第二正电原边绕组40及负电原边绕组50中的电流耦合输出第一感应电流I4，具体是根据磁通和输出第一感应电流I4。第二副边绕组70与两个自测走线7072连接，第二副边绕组70与检测模块100a电性连接，第二副边绕组70用于根据传输在第一正电原边绕组30、第二正电原边绕组40及负电原边绕组50中的电流耦合输出第二感应电流I5，具体是根据磁通和输出第二感应电流I5。需要说明的是，磁通和为第一差模电流I1、第二差模电流I2、第三差模电流I3、第一共模电流I1a、第二共模电流I2a及第三共模电流I3a在磁性结构20产生的磁通之和。
与图3所示实施例的不同之处在于，本实施例中，第一正电原边绕组30与第一走线7011及第四走线7021连接，第一正电原边绕组30与第一正极输出端901及第二升压单元402电性连接；第二正电原边绕组40与第二走线7012及第五走线7022连接，第二正电原边绕组40与第二正极输出端903及第一升压单元401电性连接。
具体的，第一正电原边绕组30包括第一端部3211与第二端部3311，第一端部3211与第二端部3311位于磁性结构20的相对两侧，且均位于固定件10背向磁性结构20的一侧。第一正电原边绕组30与电路板700连接。其中，第一端部3211与第一走线7011连接，第二端部3311与第四走线7021连接。具体的连接方式可参照图3的示例，不再赘述。可以理解，第一端部3211与第一正极输出端901电性连接，第二端部3311与第二升压单元402电性连接，也即是说第二端部3311与升压模块400及逆变模块300电性连接。第一差模电流I1及第一共模电流I1a经第一走线7011自第一端部3211输送至第一正电原边绕组30后，沿第一正电原边绕组30自第二端部3311输送至第四走线7021。
第二正电原边绕组40包括第三端部4211与第四端部4311，第三端部4211位于磁性结构20朝向第一端部3211的一侧，并与第一端部3211间隔，第四端部4311位于磁性结构20朝向第二端部3311的一侧，并与第二端部3311间隔。其中，沿X轴方向上，第三端部4211位于第一端部3211靠近第二端部3311的一侧，并与第一端部3211间隔；沿X轴方向上，第四端部4311位于第二端部3311远离第一端部3211的一侧，并与第二端部3311间隔。
第二正电原边绕组40与电路板700连接。具体的，第三端部4211与第二走线7012连接，第四端部4311与第五走线7022连接。具体的连接方式可参照图3的示例，不再赘述。可以理解，第三端部4211与第二正极输出端903电性连接，第四端部4311与第一升压单元401电性连接。第二差模电流I2及第二共模电流I2a经第二走线7012自第三端部4211输送至第二正电原边绕组40后，沿第二正电原边绕组40自第四端部4311输送至第五走线7022。
可以理解，在本实施例中，第一差模电流I1自第一正极输出端901依次沿第一线缆801、第一走线7011、第一正电原边绕组30、第五走线7022、第一升压单元401、第八走线7025及第六走线7023输送至负电原边绕组50。第二差模电流I2自第二正极输出端903依次沿第二线缆802、第二走线7012、第二正电原边绕组40、第四走线7021、第二升压单元402、第七走线7024及第六走线7023输送至负电原边绕组50。第六走线7023与第三走线7013中流动的仍是第一差模电流I1与第二差模电流I2的合路电流(即第三差模电流I3)。第一共模电 流I1a、第二共模电流I2a及第三共模电流I3a的流向与图3的示例相同，不再赘述。
负电原边绕组50包括第五端部5211及第六端部5311，第五端部5211位于磁性结构20朝向第二端部3311及第四端部4311的一侧，并与第二端部3311及第四端部4311间隔。第六端部5311位于磁性结构20朝向第一端部3211及第三端部4211的一侧，并与第一端部3211及第三端部4211间隔。其中，沿X轴方向上，第五端部5211位于第二端部3311远离第四端部4311的一侧，并与第二端部3311间隔；第六端部5311位于第三端部4211远离第一端部3211的一侧，并与第三端部4211间隔。
负电原边绕组50与电路板700连接。具体的，第五端部5211与第三走线7013连接，第六端部5311与第六走线7023连接。具体的连接方式可参照图3的示例，不再赘述。可以理解，第五端部5211与第一负极输出端902及第二负极输出端904电性连接，第六端部5311与第一升压单元401及第二升压单元402电性连接，也即是说第六端部5311与升压模块400及逆变模块300电性连接。第三差模电流I3经第六走线7023自第六端部5311输送至负电原边绕组50后，沿负电原边绕组50自第五端部5211输送至第三走线7013。
如图14所示，第一端部3211与第二端部3311均位于第五端部5211靠近第六端部5311的一侧，第三端部4211与第四端部4311均位于第六端部5311靠近第五端部5211的一侧。具体的，沿穿行通道23的延伸方向(即Y轴方向上)上，第五端部5211与第六端部5311错位设置；在第一方向(即X轴方向)上，第三端部4211与第二端部3311均位于第五端部5211与第六端部5311之间，第一端部3211位于第三端部4211背向第六端部5311的一侧，第四端部4311位于第二端部3311背向第五端部5211的一侧。
这样，根据这样设计的电流互感器500布线的电路板700，可避免设置在其上与各个绕组的端部连接的多个走线发生交叉，避免板上走线困难的问题，有利于在电路板700上设置走线，降低了布线困难，减少了布线的设计成本；而且，在避免走线交叉的同时，提高了电流互感器500的空间利用率，有利于减小电流互感器500的占板面积，有利于电流互感器500的小型化设计。
与图3实施例所示的电流互感器500相比，本实施例提供的电流互感器500可以实现同样的技术效果。可以理解，本申请对第一正电原边绕组30的端部及第二正电原边绕组40的端部的相对位置不作具体限定，电流互感器500具有较多的设计可能性，便于设计。
以上，仅为本申请的部分实施例和实施方式，本申请的保护范围不局限于此，任何熟知本领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。

Claims (17)

  1. 一种光伏变换器，用于与第一光伏模块及第二光伏模块电性连接，所述第一光伏模块包括第一正极输出端及第一负极输出端，所述第二光伏模块包括第二正极输出端及第二负极输出端，其特征在于，所述光伏变换器包括电流互感器及功率变换电路；
    所述电流互感器包括磁性结构、第一正电原边绕组、第二正电原边绕组、负电原边绕组及第一副边绕组；
    所述第一正电原边绕组穿过所述磁性结构，所述第一正电原边绕组包括第一端部及第二端部，所述第一端部与所述第一正极输出端电性连接，所述第二端部与所述功率变换电路电性连接；
    所述第二正电原边绕组穿过所述磁性结构，并与所述第一正电原边绕组间隔，所述第二正电原边绕组包括第三端部及第四端部，所述第三端部与所述第二正极输出端电性连接，所述第四端部与所述功率变换电路电性连接；
    所述负电原边绕组穿过所述磁性结构，并与所述第一正电原边绕组及所述第二正电原边绕组间隔，所述负电原边绕组包括第五端部及第六端部，所述第五端部与所述第一负极输出端及所述第二负极输出端电性连接，所述第六端部与所述功率变换电路电性连接；
    所述第一副边绕组绕制在所述磁性结构上，所述第一副边绕组用于根据传输在所述第一正电原边绕组、所述第二正电原边绕组及所述负电原边绕组中的电流耦合输出第一感应电流。
  2. 根据权利要求1所述的光伏变换器，其特征在于，所述第一端部、所述第三端部及所述第六端部位于所述磁性结构的一侧，所述第五端部、所述第四端部及所述第二端部位于所述磁性结构的另一侧。
  3. 根据权利要求2所述的光伏变换器，其特征在于，所述磁性结构具有穿行通道，所述第一正电原边绕组包括第一连接部，所述第二正电原边绕组包括第一固定部，所述负电原边绕组包括第一导电部，所述第一连接部、所述第一固定部及所述第一导电部均穿过所述穿行通道并间隔设置，所述第一导电部位于所述第一连接部及所述第一固定部之间；
    其中，沿所述穿行通道的延伸方向上，所述第一端部与所述第二端部位于所述第一连接部的相对两端，所述第三端部位于所述第一固定部朝向所述第一端部的一端，所述第四端部位于所述第一固定部朝向所述第二端部的另一端，所述第五端部位于所述第一导电部朝向所述第二端部及所述第四端部的一端，所述第六端部位于所述第一导电部朝向所述第一端部及所述第三端部的另一端。
  4. 根据权利要求3所述的光伏变换器，其特征在于，所述光伏变换器还包括电路板，所述电路板与所述第一光伏模块及所述第二光伏模块电性连接，所述电路板与所述第一端部、所述第二端部、所述第三端部、所述第四端部、所述第五端部、所述第六端部及所述功率变换电路固定连接且电性连接，所述第一端部与所述第二端部均位于所述第五端部靠近所述第六端部的一侧，所述第三端部与所述第四端部均位于所述第六端部靠近所述第五端部的一侧。
  5. 根据权利要求4所述的光伏变换器，其特征在于，沿所述磁性结构的高度方向上，所述第一导电部位于所述第一连接部及所述第一固定部之间，沿所述穿行通道的延伸方向上，所述第五端部与所述第六端部错位设置；
    在第一方向上，所述第三端部与所述第四端部均位于所述第五端部与所述第六端部之间，所述第一端部位于所述第三端部背向所述第六端部的一侧，所述第二端部位于所述第四端部背向所述第五端部的一侧；所述第一方向与所述穿行通道的延伸方向垂直，且与所述磁性结构的高度方向垂直。
  6. 根据权利要求4所述的光伏变换器，其特征在于，沿所述磁性结构的高度方向上，所述第一导电部位于所述第一连接部及所述第一固定部之间，沿所述穿行通道的延伸方向上，所述第五端部与所述第六端部错位设置；
    在第一方向上，所述第三端部与所述第二端部均位于所述第五端部与所述第六端部之间，所述第一端部位于所述第三端部背向所述第六端部的一侧，所述第四端部位于所述第二端部背向所述第五端部的一侧；所述第一方向与所述穿行通道的延伸方向垂直，且与所述磁性结构的高度方向垂直。
  7. 根据权利要求3至6任一项所述的光伏变换器，其特征在于，所述第一正电原边绕组包括第二连接部及第三连接部，所述第二连接部与所述第三连接部均沿所述磁性结构的高度方向延伸，所述第二连接部与所述第三连接部分别与所述第一连接部的相对两端部连接，所述第二连接部与所述第三连接部位于所述磁性结构的相对两侧，所述第二连接部背向所述第一连接部的端部为所述第一端部，所述第三连接部背向所述第一连接部的端部为所述第二端部；
    所述第二正电原边绕组包括第二固定部及第三固定部，所述第二固定部与所述第三固定部均沿所述磁性结构的高度方向延伸，所述第二固定部与所述第三固定部分别与所述第一固定部的相对两端部连接，所述第二固定部位于所述磁性结构朝向所述第二连接部的一侧，并与所述第二连接部间隔设置，所述第三固定部位于所述磁性结构朝向所述第三连接部的一侧，并与所述第三连接部间隔设置，所述第二固定部背向所述第一固定部的端部为所述第三端部，所述第三固定部背向所述第一固定部的端部为所述第四端部；
    所述负电原边绕组包括第二导电部及第三导电部，所述第二导电部与所述第三导电部均沿所述磁性结构的高度方向延伸，所述第二导电部与所述第三导电部分别与所述第一导电部的相对两端部连接，所述第二导电部位于所述磁性结构朝向所述第三连接部及所述第三固定部的一侧，并与所述第三连接部及所述第三固定部间隔设置，所述第三导电部位于所述磁性结构朝向所述第二连接部及所述第二固定部的一侧，并与所述第二连接部及所述第二固定部间隔设置，所述第二导电部背向所述第一导电部的端部为所述第五端部，所述第三导电部背向所述第一导电部的端部为所述第六端部。
  8. 根据权利要求3至6任一项所述的光伏变换器，其特征在于，所述第一连接部、所述第一固定部、所述第一导电部均沿所述穿行通道的延伸方向延伸。
  9. 根据权利要求3至6任一项所述的光伏变换器，其特征在于，沿所述穿行通道的延伸方向上，所述第一端部与所述第二端部的间距、所述第三端部与所述第四端部的间距、以及所述第五端部与所述第六端部的间距均相等。
  10. 根据权利要求3至6任一项所述的光伏变换器，其特征在于，在与所述穿行通道的 延伸方向垂直的方向上，所述第一连接部的投影、所述第一固定部的投影及所述第一导电部的投影均重叠。
  11. 根据权利要求3至6任一项所述的光伏变换器，其特征在于，所述磁性结构设有气隙，所述气隙连通所述穿行通道。
  12. 根据权利要求11所述的光伏变换器，其特征在于，所述磁性结构包括第一磁芯及第二磁芯，所述第一磁芯与所述第二磁芯间隔相对并具有所述气隙。
  13. 根据权利要求1至12任一项所述的光伏变换器，其特征在于，所述电流互感器还包括固定件，所述磁性结构与所述固定件固定连接，所述第一正电原边绕组、所述第二正电原边绕组及所述负电原边绕组穿装于所述固定件中，所述第一端部、所述第二端部、所述第三端部、所述第四端部、所述第五端部以及所述第六端部位于所述固定件背向所述磁性结构的一侧。
  14. 根据权利要求1至12任一项所述的光伏变换器，其特征在于，所述电流互感器还包括第二副边绕组，所述第二副边绕组绕制在所述磁性结构上，并与所述第一副边绕组间隔，所述第二副边绕组用于根据传输在所述第一正电原边绕组、所述第二正电原边绕组及所述负电原边绕组中的电流耦合输出第二感应电流。
  15. 根据权利要求1至12任一项所述的光伏变换器，其特征在于，所述功率变换电路包括升压模块及逆变模块，所述升压模块与所述第二端部、所述第四端部及所述第六端部电性连接，并与所述逆变模块电性连接。
  16. 根据权利要求1至12任一项所述的光伏变换器，其特征在于，所述光伏变换器还包括检测模块，所述检测模块与所述第一副边绕组电性连接。
  17. 一种光伏发电系统，其特征在于，包括权利要求1至16任一项所述的光伏变换器、第一光伏模块及第二光伏模块，所述第一光伏模块包括第一正极输出端及第一负极输出端，所述第二光伏模块包括第二正极输出端及第二负极输出端，所述第一正极输出端与所述第一端部电性连接，所述第二正极输出端与所述第三端部电性连接，所述第一负极输出端及所述第二负极输出端均与所述第五端部电性连接。
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Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN115149900B (zh) * 2022-06-27 2024-11-22 华为数字能源技术有限公司 光伏变换器以及光伏发电系统
CN116936236B (zh) * 2023-06-29 2024-05-31 上海正泰电源系统有限公司 一种改善直流电弧检测精度的检测互感器及方法
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202586499U (zh) * 2012-04-01 2012-12-05 上海晖保新能源科技有限公司 用于光伏电站直流侧的智能电弧检测装置
JP2018121434A (ja) * 2017-01-25 2018-08-02 富士電機機器制御株式会社 アーク故障検出装置
CN113098391A (zh) * 2021-03-19 2021-07-09 江苏固德威电源科技股份有限公司 组串级直流电弧故障检测装置和方法
DE102020115757A1 (de) * 2020-06-15 2021-12-16 Sma Solar Technology Ag Vorrichtung und verfahren zur detektion eines fehlerstroms in einer photovoltaik-anlage, sowie photovoltaik-wechselrichter mit der vorrichtung
CN115149900A (zh) * 2022-06-27 2022-10-04 华为数字技术（苏州）有限公司 光伏变换器以及光伏发电系统

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0831673A (ja) * 1994-07-11 1996-02-02 Yutaka Denki Seisakusho:Kk カレントトランスおよびカレントトランスを用いた電源装置
CN101901670A (zh) * 2009-06-01 2010-12-01 奥斯兰姆有限公司 高频互感器以及带有高频互感器的多路输出恒流源
GB2482653B (en) * 2010-06-07 2012-08-29 Enecsys Ltd Solar photovoltaic systems
EP2887082B1 (en) * 2013-12-23 2019-09-18 Sensata Technologies, Inc. Improved noise propagation immunity of a multi-string arc fault detection device
KR102205161B1 (ko) * 2014-01-15 2021-01-19 엘지전자 주식회사 전력변환장치 및 태양광 모듈
TWI537570B (zh) * 2015-11-20 2016-06-11 台達電子工業股份有限公司 改良型電弧偵測裝置
JP2017103902A (ja) * 2015-12-01 2017-06-08 田淵電機株式会社 電力変換装置
ES2880955T3 (es) * 2016-08-11 2021-11-26 Fimer S P A Una disposición de detección de fallas de arco para bus eléctrico de CC
CN108039267B (zh) * 2017-11-25 2019-10-25 华为数字技术（苏州）有限公司 电流互感器
DK3723218T3 (da) * 2017-12-29 2022-01-31 Huawei Tech Co Ltd Metode og anordning til håndtering af jævnstrømsbue
CN114175186A (zh) * 2020-07-03 2022-03-11 华为数字能源技术有限公司 一种磁性器件的电流采样系统、方法、磁性器件及功率变换器
CN113242015A (zh) * 2021-03-03 2021-08-10 青岛大学 基于多绕组反激式直流变换器的差分功率优化式dmppt光伏电池模块

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202586499U (zh) * 2012-04-01 2012-12-05 上海晖保新能源科技有限公司 用于光伏电站直流侧的智能电弧检测装置
JP2018121434A (ja) * 2017-01-25 2018-08-02 富士電機機器制御株式会社 アーク故障検出装置
DE102020115757A1 (de) * 2020-06-15 2021-12-16 Sma Solar Technology Ag Vorrichtung und verfahren zur detektion eines fehlerstroms in einer photovoltaik-anlage, sowie photovoltaik-wechselrichter mit der vorrichtung
CN113098391A (zh) * 2021-03-19 2021-07-09 江苏固德威电源科技股份有限公司 组串级直流电弧故障检测装置和方法
CN115149900A (zh) * 2022-06-27 2022-10-04 华为数字技术（苏州）有限公司 光伏变换器以及光伏发电系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4398481A4

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