WO2021179888A1 - 一种电源变换电路及充电设备 - Google Patents

一种电源变换电路及充电设备 Download PDF

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Publication number
WO2021179888A1
WO2021179888A1 PCT/CN2021/076892 CN2021076892W WO2021179888A1 WO 2021179888 A1 WO2021179888 A1 WO 2021179888A1 CN 2021076892 W CN2021076892 W CN 2021076892W WO 2021179888 A1 WO2021179888 A1 WO 2021179888A1
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WIPO (PCT)
Prior art keywords
conversion circuit
voltage
voltage conversion
circuit
output
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/CN2021/076892
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English (en)
French (fr)
Inventor
江森龙
邱治维
张加亮
田晨
张俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to EP21767742.6A priority Critical patent/EP4120533A4/en
Publication of WO2021179888A1 publication Critical patent/WO2021179888A1/zh
Priority to US17/930,987 priority patent/US20230006460A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/40—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the exchange of charge or discharge related data
    • H02J7/42—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the exchange of charge or discharge related data with electronic devices having internal batteries, e.g. mobile phones
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/96—Regulation of charging or discharging current or voltage in response to battery voltage
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • 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
    • H02M3/005—Conversion of DC power input into DC power output using Cuk converters
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/933—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters

Definitions

  • This application relates to the field of power supply technology, and in particular to a power conversion circuit and charging equipment.
  • the adapter for charging the device usually includes a power conversion circuit to convert the AC power input to the adapter into DC power for charging the terminal device to be charged.
  • the embodiments of the present application expect to provide a power conversion circuit and a charging device, which can improve the efficiency of power conversion.
  • the first aspect of the embodiments of the present application provides a power conversion circuit, including: a first voltage conversion circuit, a subsequent voltage conversion circuit, and a signal feedback circuit; the first voltage conversion circuit is connected to the subsequent voltage conversion circuit, and The signal feedback circuit is respectively connected with the first voltage conversion circuit and the subsequent voltage conversion circuit;
  • the first voltage conversion circuit is configured to convert the voltage input to the first voltage conversion circuit into the preset voltage range when the voltage input to the first voltage conversion circuit exceeds a preset voltage range Output to the subsequent voltage conversion circuit;
  • the latter-stage voltage conversion circuit is used to convert the voltage input to the latter-stage voltage conversion circuit into a target voltage and output it;
  • the signal feedback circuit is configured to feed back information to the first voltage conversion circuit according to the output of the subsequent voltage conversion circuit, so that the first voltage conversion circuit and the subsequent voltage conversion circuit are synchronized.
  • the second aspect of the embodiments of the present application also provides a charging device, which includes a power inlet, a charging interface, and a power conversion circuit; the power inlet is used for inputting alternating current, and the target voltage output by the subsequent voltage conversion circuit is used to The charging interface outputs to charge the device to be charged.
  • the power conversion circuit includes: a first voltage conversion circuit, a subsequent voltage conversion circuit, and a signal feedback circuit; the first voltage conversion circuit is connected to the subsequent voltage conversion circuit, and the signal feedback circuit is respectively connected to the first voltage conversion circuit.
  • a voltage conversion circuit is connected to the subsequent voltage conversion circuit; the first voltage conversion circuit is used to input the first voltage conversion circuit when the voltage input to the first voltage conversion circuit exceeds a preset voltage range.
  • the voltage of the voltage conversion circuit is converted into the preset voltage range and then output to the subsequent-stage voltage conversion circuit; the latter-stage voltage conversion circuit is used to convert the voltage input to the subsequent-stage voltage conversion circuit into a target After the voltage is output; the signal feedback circuit is used to feed back information to the first voltage conversion circuit according to the output of the subsequent voltage conversion circuit, so that the first voltage conversion circuit and the subsequent voltage conversion circuit Synchronize.
  • FIG. 1 is a schematic structural diagram of a power conversion circuit disclosed in an embodiment of the application
  • FIG. 2 is a schematic structural diagram of another power conversion circuit disclosed in an embodiment of the application.
  • Fig. 3 is a schematic structural diagram of another power conversion circuit disclosed in an embodiment of the application.
  • FIG. 4 is a schematic structural diagram of yet another power conversion circuit disclosed in an embodiment of the application.
  • FIG. 5 is a schematic diagram of a waveform of a pulsating DC voltage disclosed in an embodiment of the application.
  • FIG. 6 is a schematic diagram of another waveform of a pulsating DC voltage disclosed in an embodiment of the application.
  • FIG. 7 is a schematic structural diagram of a charging device disclosed in an embodiment of the application.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection. , Or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction between two components.
  • installed e.g., it may be a fixed connection or a detachable connection. , Or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction between two components.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present disclosure, “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • the power conversion circuit of the embodiment of the present application includes a first voltage conversion circuit, a subsequent voltage conversion circuit, and a signal feedback circuit; the first voltage conversion circuit is connected to the subsequent voltage conversion circuit, and the signal feedback circuit is respectively connected to the first voltage conversion circuit and the subsequent voltage conversion circuit.
  • the first voltage conversion circuit is connected; the first voltage conversion circuit is used to convert the voltage input to the first voltage conversion circuit into the preset voltage range and then output it to the rear A stage voltage conversion circuit; a subsequent stage voltage conversion circuit, used to convert the voltage input to the subsequent stage voltage conversion circuit into a target voltage and then output; a signal feedback circuit, used to convert the output of the subsequent stage voltage conversion circuit to the first voltage conversion circuit Feedback information to synchronize the first voltage conversion circuit with the subsequent voltage conversion circuit.
  • the power conversion circuit further includes a rectifier circuit, the output terminal of the rectifier circuit is connected to the input terminal of the first voltage conversion circuit; the rectifier circuit is used to convert the AC voltage input to the rectifier circuit into a pulsating DC voltage output To the first voltage conversion circuit.
  • the subsequent voltage conversion circuit includes a transformer and a second voltage conversion circuit; the primary winding of the transformer is connected to the output terminal of the first voltage conversion circuit, and the secondary winding of the transformer is connected to the input terminal of the second voltage conversion circuit. Connection; transformer, used to couple the voltage input from the first voltage conversion circuit to the subsequent voltage conversion circuit from the primary winding to the secondary winding; the second voltage conversion circuit, used to convert the voltage output by the secondary winding into the target voltage Output.
  • the second voltage conversion circuit is further configured to receive feedback information of the device to be charged connected to the power conversion circuit, and convert the voltage output by the secondary winding into a target voltage according to the feedback information.
  • the feedback information includes at least one of the following information: charging stage information of the device to be charged, battery power information of the device to be charged, battery temperature of the device to be charged, charging voltage and charging requested by the device to be charged Current, voltage adjustment signal, current adjustment signal.
  • the unidirectional conduction device included in the first voltage conversion circuit is a MOS tube; the first voltage conversion circuit further includes a trigger circuit for controlling the on and off of the MOS tube; and a trigger circuit for According to the information fed back by the signal feedback circuit, the MOS tube is controlled to be turned on or off to synchronize the first voltage conversion circuit with the subsequent voltage conversion circuit.
  • the power conversion circuit further includes a first capacitor, the first terminal of the first capacitor is connected to the input terminal of the first voltage conversion circuit, the second terminal of the first capacitor is grounded, and the first capacitor is used for boosting The voltage at the input terminal of the first voltage conversion circuit.
  • the power conversion circuit further includes a second capacitor connected between the secondary winding of the transformer and the second voltage conversion circuit, and the second capacitor is used to increase the voltage of the input terminal of the second voltage conversion circuit. Voltage.
  • the first voltage conversion circuit includes a boosting unit, and the boosting unit is configured to switch the rectifier circuit to a lower limit of the preset voltage range when the voltage output from the rectifier circuit to the first voltage conversion circuit is less than or equal to the lower limit of the preset voltage range.
  • the voltage output to the first voltage conversion circuit is converted into the preset voltage range and then output to the subsequent voltage conversion circuit.
  • the boost unit includes one or more of BOOST circuit, BUCK/BOOST circuit, charge pump circuit, and CUK circuit.
  • the first voltage conversion circuit further includes a step-down unit for rectifying when the voltage output from the rectifying circuit to the first voltage conversion circuit is greater than or equal to the upper limit of the preset voltage range The voltage output by the circuit to the first voltage conversion circuit is converted into a preset voltage range and then output to the subsequent voltage conversion circuit.
  • the step-down unit includes one or more of a BUCK circuit, a BUCK/BOOST circuit, a charge pump circuit, and a CUK circuit.
  • the step-up unit and the step-down unit are connected in parallel.
  • the charging device of the embodiment of the present application includes a power inlet, a charging interface, and a power conversion circuit.
  • the power inlet is used to input AC power
  • the target voltage output by the subsequent voltage conversion circuit is used to output from the charging interface to charge the device to be charged
  • the conversion circuit includes: a first voltage conversion circuit, a subsequent voltage conversion circuit, and a signal feedback circuit; the first voltage conversion circuit is connected to the subsequent voltage conversion circuit, and the signal feedback circuit is respectively connected to the first voltage conversion circuit and the subsequent voltage conversion circuit
  • the first voltage conversion circuit when the voltage input to the first voltage conversion circuit exceeds the preset voltage range, convert the voltage input to the first voltage conversion circuit into the preset voltage range and then output to the subsequent voltage conversion circuit;
  • the subsequent voltage conversion circuit is used to convert the voltage input to the subsequent voltage conversion circuit into a target voltage and then output; the signal feedback circuit is used to feed back information to the first voltage conversion circuit according to the output of the subsequent voltage conversion circuit, so that The first voltage conversion circuit is synchronized with the subsequent voltage conversion circuit
  • the power conversion circuit further includes a rectifier circuit, the output terminal of the rectifier circuit is connected to the input terminal of the first voltage conversion circuit; the rectifier circuit is used to convert the AC voltage input to the rectifier circuit into a pulsating DC voltage output To the first voltage conversion circuit.
  • the subsequent voltage conversion circuit includes a transformer and a second voltage conversion circuit; the primary winding of the transformer is connected to the output terminal of the first voltage conversion circuit, and the secondary winding of the transformer is connected to the input terminal of the second voltage conversion circuit. Connection; transformer, used to couple the voltage input from the first voltage conversion circuit to the subsequent voltage conversion circuit from the primary winding to the secondary winding; the second voltage conversion circuit, used to convert the voltage output by the secondary winding into the target voltage Output.
  • the second voltage conversion circuit is further configured to receive feedback information of the device to be charged connected to the power conversion circuit, and convert the voltage output by the secondary winding into a target voltage according to the feedback information.
  • the feedback information includes at least one of the following information: charging stage information of the device to be charged, battery power information of the device to be charged, battery temperature of the device to be charged, charging voltage and charging requested by the device to be charged Current, voltage adjustment signal, current adjustment signal.
  • the unidirectional conduction device included in the first voltage conversion circuit is a MOS tube; the first voltage conversion circuit further includes a trigger circuit for controlling the on and off of the MOS tube; and a trigger circuit for According to the information fed back by the signal feedback circuit, the MOS tube is controlled to be turned on or off to synchronize the first voltage conversion circuit with the subsequent voltage conversion circuit.
  • the power conversion circuit further includes a first capacitor, the first terminal of the first capacitor is connected to the input terminal of the first voltage conversion circuit, the second terminal of the first capacitor is grounded, and the first capacitor is used for boosting The voltage at the input terminal of the first voltage conversion circuit.
  • the power conversion circuit further includes a second capacitor connected between the secondary winding of the transformer and the second voltage conversion circuit, and the second capacitor is used to increase the voltage of the input terminal of the second voltage conversion circuit. Voltage.
  • the first voltage conversion circuit includes a boosting unit, and the boosting unit is configured to switch the rectifier circuit to a lower limit of the preset voltage range when the voltage output from the rectifier circuit to the first voltage conversion circuit is less than or equal to the lower limit of the preset voltage range.
  • the voltage output to the first voltage conversion circuit is converted into the preset voltage range and then output to the subsequent voltage conversion circuit.
  • the boost unit includes one or more of BOOST circuit, BUCK/BOOST circuit, charge pump circuit, and CUK circuit.
  • the first voltage conversion circuit further includes a step-down unit for rectifying when the voltage output from the rectifying circuit to the first voltage conversion circuit is greater than or equal to the upper limit of the preset voltage range The voltage output by the circuit to the first voltage conversion circuit is converted into a preset voltage range and then output to the subsequent voltage conversion circuit.
  • the step-down unit includes one or more of a BUCK circuit, a BUCK/BOOST circuit, a charge pump circuit, and a CUK circuit.
  • the step-up unit and the step-down unit are connected in parallel.
  • FIG. 1 is a schematic structural diagram of a power conversion circuit disclosed in an embodiment of the application.
  • the power conversion circuit 10 includes a first voltage conversion circuit 11, a subsequent voltage conversion circuit 12 and a signal feedback circuit 13.
  • the first voltage conversion circuit 11 is connected to the subsequent voltage conversion circuit 12, and the signal feedback circuit 13 is connected to the first voltage conversion circuit 11 and the subsequent voltage conversion circuit 12, respectively.
  • the embodiment of the present application provides a signal feedback circuit so that the signal on the secondary side of the transformer in the power conversion circuit can be fed back to the primary side, and the on and off of the primary side and secondary side switches are synchronized, thereby improving the power conversion efficiency.
  • the first voltage conversion circuit 11 is used to convert the voltage input to the first voltage conversion circuit 11 into the preset voltage range when the voltage input to the first voltage conversion circuit 11 exceeds the preset voltage range and then output it to the subsequent stage
  • the voltage conversion circuit 12; the subsequent-stage voltage conversion circuit 12 is used to convert the voltage input to the subsequent-stage voltage conversion circuit 12 into a target voltage and then output;
  • the signal feedback circuit 13 is used to output the voltage according to the output of the subsequent-stage voltage conversion circuit 12
  • a voltage conversion circuit 11 feeds back information to synchronize the first voltage conversion circuit 11 with the subsequent voltage conversion circuit 12.
  • the power conversion circuit 10 may be configured in a charging device, and the charging device may be an adapter for charging the device to be charged.
  • the device to be charged may be a smart terminal or a mobile terminal device equipped with a battery power supply system.
  • the device to be charged may also include, but is not limited to, such as laptop computers, mobile phones, e-book readers, smart wearable devices, mobile power sources (such as power banks, travel chargers), electronic cigarettes, wireless mice, wireless keyboards, wireless headsets, Bluetooth speakers Rechargeable electronic equipment with charging function.
  • the input of the first voltage conversion circuit 11 may be a pulsating DC voltage.
  • the pulsating direct current voltage is a continuous direct current that has a pulsating change in current, that is, a direct current that changes in magnitude.
  • the pulsating DC voltage can be a "steamed bun wave" obtained by alternating current through a rectifier circuit.
  • the first voltage conversion circuit 11 converts the input voltage into the preset voltage range.
  • the lower limit of the preset voltage range is greater than the lowest operating voltage of the subsequent stage voltage conversion circuit 12. Therefore, through the processing of the first voltage conversion circuit 11, the dead zone of the subsequent voltage conversion circuit 12 can be eliminated or reduced, thereby ensuring the normal operation of the subsequent voltage conversion circuit 12.
  • the output terminal of the subsequent voltage conversion circuit 12 can be connected to the device to be charged, and directly adjust the output target voltage according to the information fed back from the device to be charged, that is, to adjust the charging voltage output by the power conversion circuit 10 to the device to be charged.
  • the related technology it is necessary to feed back the information fed back by the device to be charged or the charging parameters required by the device to be charged to the primary side of the transformer in the power conversion circuit, and the output voltage of the power conversion circuit is adjusted through the primary side. . Since the feedback path of the signal feedback to the primary side is long and the real-time performance is poor, the solution of the embodiment of the present application can improve the real-time performance of the adjustment.
  • the embodiment of the present application uses the signal feedback circuit 13 to feed back information to the first voltage conversion circuit 11 based on the output of the subsequent voltage conversion circuit 12, so that the first voltage conversion circuit 11 and the subsequent voltage conversion circuit 12
  • the switching signal is synchronized, so that when the primary switching energy of the transformer in the power conversion circuit is large, the transformer secondary will also obtain a large amount of energy; when the primary is turned off without energy, the secondary will also be turned off, not requesting large energy, which can ensure
  • the input signal is clean, no multiple harmonic noises will be generated due to load and switching changes, and electromagnetic interference (Electro Magnetic Interference, EMI) problems are reduced.
  • EMI Electro Magnetic Interference
  • FIG. 2 is a schematic structural diagram of another power conversion circuit 10 disclosed in an embodiment of the application.
  • the power conversion circuit 10 may further include a rectifier circuit 14, and the output terminal of the rectifier circuit 14 is connected to the input terminal of the first voltage conversion circuit 11.
  • the rectifier circuit 14 is used to convert the AC voltage input to the rectifier circuit 14 into a pulsating DC voltage and output to the first voltage conversion circuit 11.
  • the subsequent voltage conversion circuit 12 may include a transformer 121 and a second voltage conversion circuit 122; the primary winding of the transformer 121 is connected to the output terminal of the first voltage conversion circuit 11, and the secondary winding of the transformer 121 is connected to the second voltage conversion circuit.
  • 122 is connected to the input terminal; a transformer 121 for coupling the voltage input from the first voltage conversion circuit 11 to the subsequent voltage conversion circuit 12 from the primary winding to the secondary winding; the second voltage conversion circuit 122 for connecting the secondary winding The output voltage is converted to the target voltage and then output.
  • the second voltage conversion circuit 122 is also configured to receive feedback information of the device to be charged connected to the power conversion circuit 10, and convert the voltage output by the secondary winding into a target voltage according to the feedback information.
  • the target voltage is used to output to the device to be charged to charge or power the device to be charged.
  • the feedback information includes at least one of the following information: charging stage information of the device to be charged, battery power information of the device to be charged, battery temperature of the device to be charged, and charging voltage requested by the device to be charged And charging current, voltage adjustment signal, current adjustment signal.
  • the voltage adjustment signal may be a signal used to increase or decrease voltage
  • the current adjustment signal may be a signal used to increase or decrease current.
  • the charging process of a lithium-ion battery can be commonly divided into 4 stages: trickle charging, constant current charging, constant voltage charging, and charging termination.
  • the signal feedback circuit 13 may also be used to collect the input voltage of the second voltage conversion circuit 122, and output feedback information to the first voltage conversion circuit 11 according to the input voltage of the second voltage conversion circuit 122.
  • a voltage conversion circuit 11 can adjust its output voltage according to the feedback information, so as to ensure that the input voltage of the second voltage conversion circuit 122 is within the working voltage range of the second voltage conversion circuit 122 or a working voltage range with higher efficiency.
  • the second voltage conversion circuit 122 may further include a control module configured to determine the target voltage according to the feedback information, and control the second voltage conversion circuit 122 to output the target voltage.
  • the unidirectional conduction device included in the first voltage conversion circuit 11 may be a MOS transistor, and the first voltage conversion circuit 11 further includes a trigger for controlling the on and off of the MOS transistor. Circuit; a trigger circuit for controlling the MOS tube to turn on or off according to the information fed back by the signal feedback circuit 13, so that the first voltage conversion circuit 11 and the subsequent voltage conversion circuit 13 are synchronized. As a result, the primary side and the secondary side of the transformer are synchronized. Compared with the application of diodes for unidirectional conduction devices, it saves the waste of 0.7V voltage drop on the diode, increases the operating frequency, and further improves the power conversion efficiency.
  • the power conversion circuit 10 may include a first capacitor 15, a first terminal of the first capacitor 15 is connected to an input terminal of the first voltage conversion circuit 11, and a second terminal of the first capacitor 15 is grounded.
  • the first capacitor 15 is used to increase the voltage of the input terminal of the first voltage conversion circuit 11.
  • the first capacitor 15 increases the voltage at the input terminal of the first voltage conversion circuit 11 through energy storage, thereby supporting the stability of the operation of the first voltage conversion circuit 11, and as the voltage at the input terminal of the first voltage conversion circuit 11 increases, The higher the voltage value output from the output terminal of the first voltage conversion circuit 11 is beneficial to stabilize the input voltage of the primary winding of the transformer 121 above a fixed value and reduce the dead zone of the transformer 121.
  • the power conversion circuit 10 may further include a second capacitor 16, which is connected between the secondary winding of the transformer and the second voltage conversion circuit 122, and the second capacitor 16 is used for boosting The voltage of the input terminal of the second voltage conversion circuit 122.
  • the second capacitor 16 can prevent the pulsating DC voltage input to the second voltage conversion circuit 122 from being too low, thereby ensuring the normal operation of the second voltage conversion circuit 122.
  • the technical solutions disclosed in the embodiments of the present application can also achieve miniaturization of charging equipment.
  • the filter circuit needs to use an inductor with a larger inductance value and a capacitor with a larger capacitance value. Therefore, the volume of the inductor and capacitor in the filter circuit is larger.
  • the first voltage conversion circuit is used to adjust the output voltage of the rectifier circuit 14. Inductors with smaller inductance and capacitors with smaller capacitance can be used, which is beneficial to reduce the volume of inductors and capacitors, and thereby It is beneficial to reduce the volume of charging equipment.
  • FIG. 3 is a schematic structural diagram of another power conversion circuit 10 disclosed in an embodiment of the application.
  • the first voltage conversion circuit 11 includes a boost unit 111, which is used when the voltage output from the rectifier circuit 14 to the first voltage conversion circuit 11 is less than or equal to the lower limit of the preset voltage range. , The voltage output from the rectifier circuit 14 to the first voltage conversion circuit 11 is converted into a preset voltage range and then output to the subsequent voltage conversion circuit 12.
  • the boosting unit 111 may include one or more of a BOOST circuit, a BUCK/BOOST circuit, a charge pump circuit, and a CUK circuit.
  • the first voltage conversion circuit 11 may further include a step-down unit 112, and the step-down unit 112 is configured to output a voltage from the rectifier circuit 14 to the first voltage conversion circuit 11 that is greater than or equal to a preset voltage range.
  • the step-down unit 112 is configured to output a voltage from the rectifier circuit 14 to the first voltage conversion circuit 11 that is greater than or equal to a preset voltage range.
  • the step-down unit 112 may include one or more of a BUCK circuit, a BUCK/BOOST circuit, a charge pump circuit, and a CUK circuit.
  • the first voltage conversion circuit 11 may include a control circuit for controlling the step-up unit 111 and the step-down unit 112 to work separately, that is, to control the step-up unit 111 when the voltage input to the first working voltage conversion circuit 11 is lower than a preset voltage range
  • the step-down unit 112 is controlled to operate when the voltage input to the first operating voltage conversion circuit 11 is higher than the upper limit value of the preset voltage range, so as to input the first voltage conversion circuit
  • the voltage of 11 is converted into the preset voltage range.
  • the second voltage conversion circuit 122 may also include a boost unit and/or a step-down unit.
  • the functions, connection methods and other related implementations of the boost unit and/or the step-down unit can be referred to the content disclosed above. , I won’t repeat it here.
  • FIG. 4 is a schematic structural diagram of another power conversion circuit 10 disclosed in an embodiment of the present application.
  • the post-stage voltage conversion circuit 12 may include an AC-DC power management chip 123.
  • the AC-DC power management chip 123 has a switch control terminal SW, a feedback terminal FB, and a power supply terminal Vin; One end is connected to the output end of the first voltage conversion circuit 11, the second end of the primary winding is connected to the switch control end SW of the AC-DC power management chip 123; the output end of the signal feedback circuit 13 is connected to the AC-DC power management chip 123 FB connection of the feedback terminal.
  • a winding can be separately drawn from the primary side of the transformer 121 and connected to the power supply terminal Vin of the AC-DC power management chip 123 to supply power to the AC-DC power management chip 123.
  • the AC-DC power management chip 123 integrates a switching tube electrically connected to the primary winding of the transformer 121 and a driving circuit that drives the switching tube to turn on and off.
  • the timing of transmitting electric energy from the primary winding of the transformer 121 to the secondary winding is controlled.
  • the frequency of the switching tube is relatively high (usually above 100k), so through the rapid switching of the switching tube, the voltage on the primary coil of the transformer 121 presents a pulsed square wave.
  • the secondary winding of the transformer 121 outputs a constant voltage, and the specific voltage value is determined by the frequency of the signal output from the SW terminal on the AC-DC power management chip 123.
  • the switch may also exist independently of the AC-DC power management chip 123.
  • the signal feedback circuit 13 is used to establish a feedback between the secondary winding of the transformer 121 and the AC-DC power management chip 123, so that the AC-DC power management chip 123 adjusts the switching frequency of the switching tube, so as to achieve the sum of the secondary switching signal and the AC-DC power management chip 123.
  • the purpose of primary switching signal synchronization the transformer 121 includes a primary winding Y1 and a secondary winding Y2.
  • a separate winding Y3 is provided on the primary winding side as a feedback winding.
  • the power management chip 123 assists the AC-DC power management chip 123 to implement voltage control.
  • the feedback winding can also be configured with a diode D2 and a capacitor C3 to obtain a more accurate feedback signal.
  • the signal feedback circuit 13 may include an isolated signal transmission chip, such as an optocoupler 132.
  • an optocoupler 132 may also be a high-speed transmission chip capable of transmitting a higher frequency switching synchronization signal such as a Keyssa chip.
  • a resistor divider is used on the secondary output side, and the voltage feedback signal and/or the switch synchronization signal are transmitted back through the comparator B1, the resistor R3, the resistor R4, and the optocoupler 132.
  • the comparator B1 is used to convert the received signal into a binary signal, thereby using an optocoupler for transmission; when the isolation signal transmission chip adopts other types of chips and circuits, the comparator B1 can be omitted directly to the Isolate the signal transmission chip to input analog signals.
  • the rectifier circuit 14 may include a rectifier bridge U1, a resistor R1, and a varistor R2.
  • the power supply E1 After the power supply E1 provides an AC signal, it outputs a steamed bread wave after passing through the rectifier bridge U1.
  • the steamed bread wave passes through the first capacitor 15 and the voltage amplitude increases. At the same time, the lowest voltage is raised, so that the voltage amplitude of the steamed bun wave is within the working range of the first voltage conversion circuit 11, and the stable output of the first voltage conversion circuit 11 is ensured.
  • a diode D1 may be further configured between the secondary winding of the transformer 121 and the second voltage conversion circuit 122, and the output terminal of the second voltage conversion circuit 122 may also be configured with a resistor R5 to further increase the voltage output to the device to be charged. The stability.
  • the power conversion circuit 10 shown in FIG. 4 Take the power conversion circuit 10 shown in FIG. 4 as an example, where the power supply E1 provides 220V AC voltage, the sine wave of the AC voltage passes through the rectifier circuit 14 and then outputs the steamed bun wave (pulsating DC voltage signal), as shown in FIG. 5, the voltage The lowest point of the amplitude approaches 0V. After the steamed bun wave passes through the first capacitor 15, the lowest voltage is raised.
  • the output waveform is shown in Figure 6.
  • the peak load power is 120W
  • the first capacitor 15 is 100 ⁇ F. , Can effectively support the work of the first voltage conversion circuit.
  • the minimum voltage of the steamed bun wave is raised to 4V, the first voltage conversion circuit with the minimum operating voltage not less than 4V can be used.
  • resistors R4 and R3 can also be variable resistors, and the resistance ratio of R4 and R3 is controlled by adjusting the resistance of R4 and R3, so as to realize the adjustment of the output voltage on the secondary winding.
  • the stable working first voltage conversion circuit 11 can stabilize the voltage applied to the primary winding of the transformer 121, thereby stabilizing the output voltage induced by the secondary winding, and will not follow the alternating current signal from peak to valley. Change, avoid the dead zone in the output of the transformer, and make the power conversion circuit 10 work stably.
  • FIG. 7 is a schematic structural diagram of a charging device 20 disclosed in an embodiment of the application.
  • the charging device 20 includes a power inlet 21, a charging interface 22, and the power conversion circuit 10 as described in any of the foregoing embodiments.
  • the power inlet 21 is used to input AC power, and the target voltage output by the subsequent voltage conversion circuit in the power conversion circuit 10 is used to output from the charging interface 22 to charge the device to be charged.

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Abstract

一种电源变换电路(10)和充电设备(20)，包括：在电压超出预设电压范围时将电压转换后输出的第一电压转换电路(11)；接收该电压并转换为目标电压输出的后级电压转换电路(12)；根据该目标电压向第一电压转换电路(11)反馈信号，以使第一电压转换电路(11)与后级电压转换电路(12)同步的信号反馈电路(13)。

Description

一种电源变换电路及充电设备
优先权信息
本申请请求2020年3月12日向中国国家知识产权局提交的、专利申请号为202010172611.X的专利申请的优先权和权益，并且通过参照将其全文并入此处。
技术领域
本申请涉及电源技术领域，尤其涉及一种电源变换电路及充电设备。
背景技术
随着充电技术的发展，终端设备对于充电的速度要求越来越高。对设备进行充电的适配器通常包含电源变换电路，从而将输入至适配器的交流电转换为直流电为待充电的终端设备进行充电。
发明内容
本申请实施例期望提供一种电源变换电路及一种充电设备，能够提高电源变换的效率。
本申请实施例第一方面提供一种电源变换电路，包括：第一电压转换电路，后级电压转换电路，信号反馈电路；所述第一电压转换电路与所述后级电压转换电路连接，所述信号反馈电路分别与所述第一电压转换电路和所述后级电压转换电路连接；
所述第一电压转换电路，用于在输入所述第一电压转换电路的电压超出预设电压范围时，将所述输入所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路；
所述后级电压转换电路，用于将输入至所述后级电压转换电路的电压转换为目标电压后输出；
所述信号反馈电路，用于根据所述后级电压转换电路的输出向所述第一电压转换电路反馈信息，以使所述第一电压转换电路与所述后级电压转换电路同步。
本申请实施例第二方面还提供一种充电设备，该充电设备包括电源接入口，充电接口，以及电源变换电路；电源接入口用于输入交流电，后级电压转换电路输出的目标电压用于从充电接口输出以为待充电设备充电。所述电源变换电路包括：第一电压转换电路，后级电压转换电路，信号反馈电路；所述第一电压转换电路与所述后级电压转换电路连接，所述信号反馈电路分别与所述第一电压转换电路和所述后级电压转换电路连接；所述第一电压转换电路，用于在输入所述第一电压转换电路的电压超出预设电压范围时，将所述输入所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路；所述后级电压转换电路，用于将输入至所述后级电压转换电路的电压转换为目标电压后输出；所述信号反馈电路，用于根据所述后级电压转换电路的输出向所述第一电压转换电路反馈信息，以使所述第一电压转换电路与所述后级电压转换电路同步。
本申请实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
本申请的上述和/或附加的方面和优点可以从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1为本申请实施例公开的一种电源变换电路的结构示意图；
图2为本申请实施例公开的另一种电源变换电路的结构示意图；
图3为本申请实施例公开的另一种电源变换电路的结构示意图；
图4为本申请实施例公开的又一种电源变换电路的结构示意图；
图5为本申请实施例公开的一种脉动直流电压的波形示意图；
图6为本申请实施例公开的另一种脉动直流电压的波形示意图；
图7为本申请实施例公开的一种充电设备的结构示意图。
具体实施方式
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的范例；相反，提供这些实施方式使得本公开将更加全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。附图仅为本公开的示意性图解，并非一定是按比例绘制。图中相同的附图标记表示相同或类似的部分，因而将省略对它们的重复描述。
此外，所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施方式中。在下面的描述中，提供许多具体细节从而给出对本公开的实施方式的充分理解。然而，本领域技术人员将意识到，可以实践本公开的技术方案而省略所述特定细节中的一个或更多，或者可以采用其它的方法、组元、装置、步骤等。在其它情况下，不详细示出或描述公知结构、方法、装置、实现、材料或者操作以避免喧宾夺主而使得本公开的各方面变得模糊。
在本公开中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接或可以互相通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
本申请实施例的电源变换电路包括第一电压转换电路、后级电压转换电路和信号反馈电路；第一电压转换电路与后级电压转换电路连接，信号反馈电路分别与第一电压转换电路和后级电压转换电路连接；第一电压转换电路，用于在输入第一电压转换电路的电压超出预设电压范围时，将输入第一电压转换电路的电压转换至预设电压范围内后输出至后级电压转换电路；后级电压转换电路，用于将输入至后级电压转换电路的电压转换为目标电压后输出；信号反馈电路，用于根据后级电压转换电路的输出向第一电压转换电路反馈信息，以使第一电压转换电路与后级电压转换电路同步。
在某些实施方式中，电源变换电路还包括整流电路，整流电路的输出端与第一电压转换电路的输入端连接；整流电路，用于将输入至整流电路的交流电压转换为脉动直流电压输出至第一电压转换电路。
在某些实施方式中，后级电压转换电路包括变压器及第二电压转换电路；变压器的初级绕组与第一电压转换电路的输出端连接，变压器的次级绕组与第二电压转换电路的输入端连接；变压器，用于将第一电压转换电路输入至后级电压转换电路的电压由初级绕组耦合至次级绕组；第二电压转换电路，用于将次级绕组输出的电压转换为目标电压后输出。
在某些实施方式中，第二电压转换电路，还用于接收与电源变换电路连接的待充电设备的反馈信息，根据反馈信息将次级绕组输出的电压转换为目标电压。
在某些实施方式中，反馈信息包括以下信息中的至少一项：待充电设备的充电阶段信息、待充电设备的电池电量信息、待充电设备的电池温度、待充电设备请求的充电电压和充电电流、电压调整信号、电流调整信号。
在某些实施方式中，第一电压转换电路中所包括的单向导通器件为MOS管；第一电压转换电路还包括用于控制MOS管导通和关断的触发电路；触发电路，用于根据信号反馈电路反馈的信息，控制MOS管导通或关断，以使第一电压转换电路与后级电压转换电路同步。
在某些实施方式中，电源变换电路还包括第一电容，第一电容的第一端与第一电压转换电路的输入端连接，第一电容的第二端接地，第一电容用于升高第一电压转换电路的输入端的电压。
在某些实施方式中，电源变换电路还包括第二电容，第二电容连接于变压器的次级绕组与第二电压转换电路之间，第二电容用于升高第二电压转换电路的输入端的电压。
在某些实施方式中，第一电压转换电路包括升压单元，升压单元用于在整流电路输出至第一电压转换电路的电压小于或等于预设电压范围的下限值时，将整流电路输出至第一电压转换电路的电压转换至预设电压范围内后输出至后级电压转换电路。
在某些实施方式中，升压单元包括：BOOST电路、BUCK/BOOST电路、电荷泵电路、CUK电路中的一个或多个。
在某些实施方式中，第一电压转换电路还包括降压单元，降压单元用于在整流电路输出至第一电压转换电路的电压大于或等于预设电压范围的上限值时，将整流电路输出至第一电压转换电路的电压转换至预设电压范围内后输出至后级电压转换电路。
在某些实施方式中，降压单元包括：BUCK电路、BUCK/BOOST电路、电荷泵电路、CUK电路中的一个或多个。
在某些实施方式中，升压单元和降压单元并联连接。
本申请实施例的充电设备包括电源接入口，充电接口，以及电源变换电路，电源接入口用于输入交流电，后级电压转换电路输出的目标电压用于从充电接口输出以为待充电设备充电；电源变换电路包括：第一电压转换电路，后级电压转换电路，信号反馈电路；第一电压转换电路与后级电压转换电路连接，信号反馈电路分别与第一电压转换电路和后级电压转换电路连接；第一电压转换电路，用于在输入第一电压转换电路的电压超出预设电压范围时，将输入第一电压转换电路的电压转换至预设电压范围内后输出至后级电压转换电路；后级电压转换电路，用于将输入至后级电压转换电路的电压转换为目标电压后输出； 信号反馈电路，用于根据后级电压转换电路的输出向第一电压转换电路反馈信息，以使第一电压转换电路与后级电压转换电路同步。
在某些实施方式中，电源变换电路还包括整流电路，整流电路的输出端与第一电压转换电路的输入端连接；整流电路，用于将输入至整流电路的交流电压转换为脉动直流电压输出至第一电压转换电路。
在某些实施方式中，后级电压转换电路包括变压器及第二电压转换电路；变压器的初级绕组与第一电压转换电路的输出端连接，变压器的次级绕组与第二电压转换电路的输入端连接；变压器，用于将第一电压转换电路输入至后级电压转换电路的电压由初级绕组耦合至次级绕组；第二电压转换电路，用于将次级绕组输出的电压转换为目标电压后输出。
在某些实施方式中，第二电压转换电路，还用于接收与电源变换电路连接的待充电设备的反馈信息，根据反馈信息将次级绕组输出的电压转换为目标电压。
在某些实施方式中，反馈信息包括以下信息中的至少一项：待充电设备的充电阶段信息、待充电设备的电池电量信息、待充电设备的电池温度、待充电设备请求的充电电压和充电电流、电压调整信号、电流调整信号。
在某些实施方式中，第一电压转换电路中所包括的单向导通器件为MOS管；第一电压转换电路还包括用于控制MOS管导通和关断的触发电路；触发电路，用于根据信号反馈电路反馈的信息，控制MOS管导通或关断，以使第一电压转换电路与后级电压转换电路同步。
在某些实施方式中，电源变换电路还包括第一电容，第一电容的第一端与第一电压转换电路的输入端连接，第一电容的第二端接地，第一电容用于升高第一电压转换电路的输入端的电压。
在某些实施方式中，电源变换电路还包括第二电容，第二电容连接于变压器的次级绕组与第二电压转换电路之间，第二电容用于升高第二电压转换电路的输入端的电压。
在某些实施方式中，第一电压转换电路包括升压单元，升压单元用于在整流电路输出至第一电压转换电路的电压小于或等于预设电压范围的下限值时，将整流电路输出至第一电压转换电路的电压转换至预设电压范围内后输出至后级电压转换电路。
在某些实施方式中，升压单元包括：BOOST电路、BUCK/BOOST电路、电荷泵电路、CUK电路中的一个或多个。
在某些实施方式中，第一电压转换电路还包括降压单元，降压单元用于在整流电路输出至第一电压转换电路的电压大于或等于预设电压范围的上限值时，将整流电路输出至第一电压转换电路的电压转换至预设电压范围内后输出至后级电压转换电路。
在某些实施方式中，降压单元包括：BUCK电路、BUCK/BOOST电路、电荷泵电路、CUK电路中的一个或多个。
在某些实施方式中，升压单元和降压单元并联连接。
图1为本申请实施例公开的一种电源变换电路的结构示意图。如图1所示，电源变换电路10包括第一电压转换电路11、后级电压转换电路12及信号反馈电路13。其中第一电压转换电路11与后级电压转换电路12连接，信号反馈电路13分别与第一电压转换电路11和后级电压转换电路12连接。
为了提高充电速度，降低适配器充电时的发热，如何提高电源变换电路的能量传递效 率，成为一个亟待解决的问题。
本申请实施例通过设置信号反馈电路，使得电源变换电路中变压器次级侧的信号可以反馈至初级侧，初级侧和次级侧开关的导通和关断实现同步，从而提高电源变换效率。
其中，第一电压转换电路11，用于在输入第一电压转换电路11的电压超出预设电压范围时，将输入第一电压转换电路11的电压转换至预设电压范围内后输出至后级电压转换电路12；后级电压转换电路12，用于将输入至后级电压转换电路12的电压转换为目标电压后输出；信号反馈电路13，用于根据后级电压转换电路12的输出向第一电压转换电路11反馈信息，以使第一电压转换电路11与后级电压转换电路12同步。
在本申请实施例中，电源变换电路10可以配置在充电设备中，充电设备可为适配器，用于为待充电设备充电。其中，待充电设备可为配置有电池供电系统的智能终端、移动终端设备等。该待充电设备还可以包括但不限于诸如笔记本电脑、手机、电子书阅读器、智能穿戴设备、移动电源(如充电宝、旅充)、电子烟、无线鼠标、无线键盘、无线耳机、蓝牙音箱等具有充电功能的可充电电子设备。
本申请实施例中，第一电压转换电路11的输入可为脉动直流电压。脉动直流电压为电流有脉动变化、但连续的直流电，也就是电流大小变化的直流电。举例来说，脉动直流电压可为交流电经整流电路后获得的“馒头波”。在输入至第一电压转换电路11的电压超出预设电压范围时，第一电压转换电路11将输入的电压转换至预设电压范围内。其中，预设电压范围的下限值大于后级电压转换电路12的最低工作电压。因此，通过第一电压转换电路11的处理，能够消除或减少后级电压转换电路12的工作死区，从而保证后级电压转换电路12正常工作。
另一方面，后级电压转换电路12的输出端可与待充电设备连接，直接根据待充电设备所反馈的信息，调节输出的目标电压，即调节电源变换电路10输出给待充电设备的充电电压，从而满足待充电设备的充电需求。与相关技术相比，相关技术中，需要将待充电设备反馈的信息或待充电设备所需的充电参数反馈至电源变换电路中变压器的初级侧，通过初级侧进行电源变换电路的输出电压的调节。由于信号反馈至初级侧的反馈路径较长，实时性差，因此，本申请实施例的方案能够提高调整的实时性。
除此之外，本申请实施例通过信号反馈电路13，根据后级电压转换电路12的输出向第一电压转换电路11反馈信息，以使第一电压转换电路11与后级电压转换电路12的开关信号同步，这样在电源变换电路中变压器初级开关能量较大的时候，变压器次级同样获取较大的能量；到初级关闭无能量的时候，次级也关闭，不索取大能量，这样可以保证输入信号干净，不会因为负载，开关变化产生多次谐波噪音，减少电磁干扰(Electro Magnetic Interference，EMI)等问题，对输入电容的要求也可降低，并且能进一步提升电源变换效率。
如图2所示，图2为本申请实施例公开的另一种电源变换电路10的结构示意图。其中，电源变换电路10还可以包括整流电路14，整流电路14的输出端与第一电压转换电路11的输入端连接。整流电路14，用于将输入至整流电路14的交流电压转换为脉动直流电压输出至第一电压转换电路11。
具体地，后级电压转换电路12可以包括变压器121及第二电压转换电路122；变压器121的初级绕组与第一电压转换电路11的输出端连接，变压器121的次级绕组与第二 电压转换电路122的输入端连接；变压器121，用于将第一电压转换电路11输入至后级电压转换电路12的电压由初级绕组耦合至次级绕组；第二电压转换电路122，用于将次级绕组输出的电压转换为目标电压后输出。
具体地，第二电压转换电路122，还用于接收与电源变换电路10连接的待充电设备的反馈信息，根据反馈信息将次级绕组输出的电压转换为目标电压。目标电压被用于输出至待充电设备，为待充电设备充电或供电。
作为一种可选的实施方式，反馈信息包括以下信息中的至少一项：待充电设备的充电阶段信息、待充电设备的电池电量信息、待充电设备的电池温度、待充电设备请求的充电电压和充电电流、电压调整信号、电流调整信号。其中，电压调整信号可为用于提高电压或降低电压的信号，电流调整信号可为用于提高电流或降低电流的信号。
针对充电阶段信息，举例来说，锂离子电池的充电过程常见的可区分为4个阶段：涓流充电、恒流充电、恒压充电以及充电终止。
作为一种可选的实施方式，信号反馈电路13还可以用于采集第二电压转换电路122的输入电压，根据第二电压转换电路122的输入电压向第一电压转换电路11输出反馈信息，第一电压转换电路11可以根据该反馈信息调整其输出的电压，从而保证第二电压转换电路122的输入电压处于第二电压转换电路122的可工作电压范围或效率较高的工作电压范围。
作为一种可选的实施方式，第二电压转换电路122还可以包括控制模块，控制模块用于根据反馈信息，确定目标电压，并控制第二电压转换电路122输出目标电压。
作为一种可选的实施方式，第一电压转换电路11中所包括的单向导通器件可为MOS管，第一电压转换电路11还包括用于控制所述MOS管导通和关断的触发电路；触发电路，用于根据信号反馈电路反馈13的信息，控制MOS管导通或关断，以使第一电压转换电路11与后级电压转换电路13同步。从而使得变压器初级侧和次级侧进行同步，与单向导通器件应用二极管相比，节省二极管上0.7V的压降浪费，并提高工作频率，进一步提高电源变换效率。
作为一种可选的实施方式，电源变换电路10可以包括第一电容15，第一电容15的第一端与第一电压转换电路11的输入端连接，第一电容15的第二端接地，第一电容15用于升高第一电压转换电路11的输入端的电压。
第一电容15通过储能从而升高第一电压转换电路11输入端的电压，从而支持了第一电压转换电路11工作的稳定性，并且由于第一电压转换电路11输入端的电压升高，从而升高了第一电压转换电路11输出端输出的电压值，有利于将变压器121的初级绕组的输入电压稳定在一个定值之上，减小变压器121的工作死区。
作为一种可选的实施方式，电源变换电路10还可以包括第二电容16，第二电容16连接于变压器的次级绕组与第二电压转换电路122之间，第二电容16用于升高第二电压转换电路122的输入端的电压。
第二电容16可以使得输入至第二电压转换电路122的脉动直流电压不会过低，从而保证第二电压转换电路122的正常工作。
本申请实施例所公开的技术方案还能够实现充电设备的小型化。相较于在整流电路14后设置滤波电路以平滑整流电路14的输出电压，滤波电路需要用到电感值较大的电感 以及容值较大的电容，因此滤波电路内电感和电容的体积较大。本申请实施例中使用第一电压转换电路以对整流电路14的输出电压进行调整，能够使用电感值较小的电感以及容值较小的电容，从而有利于减小电感、电容的体积，进而有利于减小充电设备的体积。
请参阅图3，图3为本申请实施例公开的另一种电源变换电路10的结构示意图。如图3所示，第一电压转换电路11包括升压单元111，升压单元111用于在整流电路14输出至第一电压转换电路11的电压小于或等于预设电压范围的下限值时，将整流电路14输出至第一电压转换电路11的电压转换至预设电压范围内后输出至后级电压转换电路12。
作为一种可选的实施方式，升压单元111可以包括：BOOST电路、BUCK/BOOST电路、电荷泵电路、CUK电路中的一个或多个。
作为一种可选的实施方式，第一电压转换电路11还可以包括降压单元112，降压单元112用于在整流电路14输出至第一电压转换电路11的电压大于或等于预设电压范围的上限值时，将整流电路14输出至第一电压转换电路11的电压转换至预设电压范围内后输出至后级电压转换电路12。
作为一种可选的实施方式，降压单元112可以包括：BUCK电路、BUCK/BOOST电路、电荷泵电路、CUK电路中的一个或多个。
作为一种可选的实施方式，升压单元111和降压单元112并联连接。第一电压转换电路11可以包括控制电路，用以控制升压单元111和降压单元112分别工作，即控制升压单元111在输入至第一工作电压转换电路11的电压低于预设电压范围的下限值的情况下工作，并控制降压单元112在输入至第一工作电压转换电路11的电压高于预设电压范围的上限值的情况下工作，从而将输入第一电压转换电路11的电压转换至预设电压范围内。
可以理解的是，第二电压转换电路122也可以包括升压单元和/或降压单元，升压单元和/或降压单元的功能、连接方式及其他相关实现，可以参考以上所公开的内容，在此不再赘述。
请参阅图4，图4为本申请实施例公开的又一种电源变换电路10的结构示意图。如图4所示，后级电压变换电路12可以包括AC-DC电源管理芯片123，AC-DC电源管理芯片123具有开关控制端SW、反馈端FB，供电端Vin；变压器121的初级绕组的第一端与第一电压转换电路11的输出端连接，初级绕组的第二端与AC-DC电源管理芯片123的开关控制端SW连接；信号反馈电路13的输出端与AC-DC电源管理芯片123的反馈端FB连接。可以从变压器121的初级侧单独引出一个绕组与AC-DC电源管理芯片123的供电端Vin连接，以为AC-DC电源管理芯片123供电。
在该实施例中，AC-DC电源管理芯片123内集成了与变压器121初级绕组电连接的开关管以及驱动该开关管导通关断的驱动电路。通过控制该开关管的导通或关断，以控制变压器121初级绕组向次级绕组传输电能的时机。开关管的频率较高(通常为100k以上)，因此通过开关管的快速切换，变压器121初级线圈上的电压呈现为脉冲方波。变压器121次级绕组输出恒定的电压，具体的电压值大小由AC-DC电源管理芯片123上的SW端输出信号的频率决定。在另一实施例中，该开关也可以独立于AC-DC电源管理芯片123而存在。
信号反馈电路13用于在变压器121的次级绕组和AC-DC电源管理芯片123之间建立反馈，以使AC-DC电源管理芯片123调整开关管的切换频率，从而达到使得次级开关信 号和初级开关信号同步的目的。在一实施例中，变压器121包括初级绕组Y1和次级绕组Y2，初级绕组侧设置一单独的绕组Y3作为反馈绕组，通过电磁感应，获取变压器次级绕组Y2的电压信号以输入至AC-DC电源管理芯片123以协助AC-DC电源管理芯片123实施电压控制。可选地，反馈绕组还可以配置二极管D2和电容C3，以获得较为准确的反馈信号。
在另一实施例中，信号反馈电路13可包括一个隔离信号传输芯片，例如光耦132，可选的，也可为Keyssa芯片等能够传输更高频率开关同步信号的高速速传芯片。如图所示，作为一种可选的实施方式，在次级输出侧用电阻分压，通过比较器B1、电阻R3、电阻R4与光耦132传回电压反馈信号和/或开关同步信号。可以理解的是，比较器B1用于将接收到的信号转换为二元的信号，从而利用光耦进行传输；当隔离信号传输芯片采用其他类型的芯片和电路时，可以省略比较器B1直接向隔离信号传输芯片输入模拟信号。
具体地，整流电路14可以包括整流桥U1、电阻R1和压敏电阻R2，其中，电源E1提供交流信号后，经过整流桥U1后输出馒头波，馒头波经过第一电容15后电压幅度升高，同时最低电压被抬高，使馒头波的电压幅度在第一电压转换电路11的工作范围内，保证第一电压转换电路11的稳定输出。
可选地，变压器121的次级绕组和第二电压转换电路122之间还可以配置二极管D1，第二电压转换电路122的输出端还可以配置电阻R5，以进一步提高输出至待充电设备的电压的稳定性。
以图4所示的电源变换电路10来进行举例，其中，电源E1提供220V交流电压，交流电压的正弦波经过整流电路14后输出馒头波(脉动直流电压信号)，如图5所示，电压幅度最低点趋近于0V，馒头波经过第一电容15后，最低电压被抬高，输出波形如图6所示，举例来说，如果输出峰值120W负载功率时，第一电容15为100μF时，能够有效支持第一电压转换电路的工作，例如，馒头波的最低电压被抬高至4V，则可以采用最低工作电压不低于4V的第一电压转换电路。
需要说明的是，电阻R4、R3还可以是可变电阻，通过调整R4和R3的阻止来控制R4和R3的阻值比，从而实现对次级绕组上的输出电压的调整。
可以理解的是，稳定工作的第一电压转换电路11能够使加在变压器121初级绕组上的电压稳定，从而使次级绕组感应的输出电压稳定，而不会随着交流电信号从波峰到波谷变化，避免变压器输出存在死区，使电源变换电路10稳定工作。
请参阅图7，图7为本申请实施例公开的一种充电设备20的结构示意图。如图7所示，充电设备20包括电源接入口21，充电接口22，以及如上述任意实施例所述的电源变换电路10。电源接入口21用于输入交流电，电源变换电路10中的后级电压转换电路输出的目标电压用于从充电接口22输出以为待充电设备充电。
需要注意的是，上述附图仅是根据本公开示例性实施方式的方法所包括的处理的示意性说明，而不是限制目的。易于理解，上述附图所示的处理并不表明或限制这些处理的时间顺序。另外，也易于理解，这些处理可以是例如在多个模块中同步或异步执行的。
以上具体地示出和描述了本公开的示例性实施方式。应可理解的是，本公开不限于这里描述的详细结构、设置方式或实现方法；相反，本公开意图涵盖包含在所附权利要求的精神和范围内的各种修改和等效设置。

Claims (22)

  1. 一种电源变换电路，其特征在于，包括：第一电压转换电路，后级电压转换电路，信号反馈电路；所述第一电压转换电路与所述后级电压转换电路连接，所述信号反馈电路分别与所述第一电压转换电路和所述后级电压转换电路连接；
    所述第一电压转换电路，用于在输入所述第一电压转换电路的电压超出预设电压范围时，将所述输入所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路；
    所述后级电压转换电路，用于将输入至所述后级电压转换电路的电压转换为目标电压后输出；
    所述信号反馈电路，用于根据所述后级电压转换电路的输出向所述第一电压转换电路反馈信息，以使所述第一电压转换电路与所述后级电压转换电路同步。
  2. 根据权利要求1所述的电源变换电路，其特征在于，所述电源变换电路还包括整流电路，所述整流电路的输出端与所述第一电压转换电路的输入端连接；
    所述整流电路，用于将输入至所述整流电路的交流电压转换为脉动直流电压输出至所述第一电压转换电路。
  3. 根据权利要求1所述的电源变换电路，其特征在于，所述后级电压转换电路包括变压器及第二电压转换电路；所述变压器的初级绕组与所述第一电压转换电路的输出端连接，所述变压器的次级绕组与所述第二电压转换电路的输入端连接；
    所述变压器，用于将所述第一电压转换电路输入至所述后级电压转换电路的电压由初级绕组耦合至次级绕组；
    所述第二电压转换电路，用于将所述次级绕组输出的电压转换为所述目标电压后输出。
  4. 根据权利要求3所述的电源变换电路，其特征在于，所述第二电压转换电路，还用于接收与所述电源变换电路连接的待充电设备的反馈信息，根据所述反馈信息将所述次级绕组输出的电压转换为所述目标电压。
  5. 根据权利要求4所述的电源变换电路，其特征在于，所述反馈信息包括以下信息中的至少一项：所述待充电设备的充电阶段信息、所述待充电设备的电池电量信息、所述待充电设备的电池温度、所述待充电设备请求的充电电压和充电电流、电压调整信号、电流调整信号。
  6. 根据权利要求1所述的电源变换电路，其特征在于，所述第一电压转换电路中所包括的单向导通器件为MOS管；所述第一电压转换电路还包括用于控制所述MOS管导通和关断的触发电路；
    所述触发电路，用于根据所述信号反馈电路反馈的信息，控制所述MOS管导通或关断，以使所述第一电压转换电路与所述后级电压转换电路同步。
  7. 根据权利要求1所述的电源变换电路，其特征在于，所述电源变换电路还包括第一电容，所述第一电容的第一端与所述第一电压转换电路的输入端连接，所述第一电容的第二端接地，所述第一电容用于升高所述第一电压转换电路的输入端的电压。
  8. 根据权利要求3所述的电源变换电路，其特征在于，所述电源变换电路还包括第二电容，所述第二电容连接于所述变压器的次级绕组与所述第二电压转换电路之间，所述第二电容用于升高所述第二电压转换电路的输入端的电压。
  9. 根据权利要求1-8中任意一项所述的电源变换电路，其特征在于，所述第一电压转换电路包括升压单元，所述升压单元用于在所述整流电路输出至所述第一电压转换电路的电压小于或等于所述预设电压范围的下限值时，将所述整流电路输出至所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路。
  10. 根据权利要求9所述的电源变换电路，其特征在于，所述第一电压转换电路还包括降压单元，所述降压单元用于在所述整流电路输出至所述第一电压转换电路的电压大于或等于所述预设电压范围的上限值时，将所述整流电路输出至所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路。
  11. 根据权利要求10所述的电源变换电路，其特征在于，所述升压单元和所述降压单元并联连接。
  12. 一种充电设备，其特征在于，所述充电设备包括电源接入口，充电接口，以及电源变换电路，所述电源接入口用于输入交流电，所述后级电压转换电路输出的所述目标电压用于从所述充电接口输出以为待充电设备充电；所述电源变换电路包括：
    第一电压转换电路，后级电压转换电路，信号反馈电路；所述第一电压转换电路与所述后级电压转换电路连接，所述信号反馈电路分别与所述第一电压转换电路和所述后级电压转换电路连接；
    所述第一电压转换电路，用于在输入所述第一电压转换电路的电压超出预设电压范围时，将所述输入所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路；
    所述后级电压转换电路，用于将输入至所述后级电压转换电路的电压转换为目标电压后输出；
    所述信号反馈电路，用于根据所述后级电压转换电路的输出向所述第一电压转换电路反馈信息，以使所述第一电压转换电路与所述后级电压转换电路同步。
  13. 根据权利要求12所述的充电设备，其特征在于，所述电源变换电路还包括整流电路，所述整流电路的输出端与所述第一电压转换电路的输入端连接；
    所述整流电路，用于将输入至所述整流电路的交流电压转换为脉动直流电压输出至所述第一电压转换电路。
  14. 根据权利要求12所述的充电设备，其特征在于，所述后级电压转换电路包括变压器及第二电压转换电路；所述变压器的初级绕组与所述第一电压转换电路的输出端连接，所述变压器的次级绕组与所述第二电压转换电路的输入端连接；
    所述变压器，用于将所述第一电压转换电路输入至所述后级电压转换电路的电压由初级绕组耦合至次级绕组；
    所述第二电压转换电路，用于将所述次级绕组输出的电压转换为所述目标电压后输出。
  15. 根据权利要求14所述的充电设备，其特征在于，所述第二电压转换电路，还用于接收与所述电源变换电路连接的待充电设备的反馈信息，根据所述反馈信息将所述次级绕组输出的电压转换为所述目标电压。
  16. 根据权利要求15所述的充电设备，其特征在于，所述反馈信息包括以下信息中的至少一项：所述待充电设备的充电阶段信息、所述待充电设备的电池电量信息、所述待充电设备的电池温度、所述待充电设备请求的充电电压和充电电流、电压调整信号、电流调整信号。
  17. 根据权利要求12所述的充电设备，其特征在于，所述第一电压转换电路中所包括的单向导通器件为MOS管；所述第一电压转换电路还包括用于控制所述MOS管导通和关断的触发电路；
    所述触发电路，用于根据所述信号反馈电路反馈的信息，控制所述MOS管导通或关断，以使所述第一电压转换电路与所述后级电压转换电路同步。
  18. 根据权利要求12所述的充电设备，其特征在于，所述电源变换电路还包括第一电容，所述第一电容的第一端与所述第一电压转换电路的输入端连接，所述第一电容的第二端接地，所述第一电容用于升高所述第一电压转换电路的输入端的电压。
  19. 根据权利要求14所述的充电设备，其特征在于，所述电源变换电路还包括第二电容，所述第二电容连接于所述变压器的次级绕组与所述第二电压转换电路之间，所述第二电容用于升高所述第二电压转换电路的输入端的电压。
  20. 根据权利要求12-19任意一项所述的充电设备，其特征在于，所述第一电压转换电路包括升压单元，所述升压单元用于在所述整流电路输出至所述第一电压转换电路的电压小于或等于所述预设电压范围的下限值时，将所述整流电路输出至所述第一电压转换电路的电压转换至所述预设电压范围内后输出至所述后级电压转换电路。
  21. 根据权利要求20所述的充电设备，其特征在于，所述第一电压转换电路还包括降压单元，所述降压单元用于在所述整流电路输出至所述第一电压转换电路的电压大于或等于所述预设电压范围的上限值时，将所述整流电路输出至所述第一电压转换电路的电压 转换至所述预设电压范围内后输出至所述后级电压转换电路。
  22. 根据权利要求21所述的充电设备，其特征在于，所述升压单元和所述降压单元并联连接。
PCT/CN2021/076892 2020-03-12 2021-02-19 一种电源变换电路及充电设备 Ceased WO2021179888A1 (zh)

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