WO2024001663A1 - 家电设备中全母线负载放电控制方法及相关装置 - Google Patents

家电设备中全母线负载放电控制方法及相关装置 Download PDF

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Publication number
WO2024001663A1
WO2024001663A1 PCT/CN2023/097854 CN2023097854W WO2024001663A1 WO 2024001663 A1 WO2024001663 A1 WO 2024001663A1 CN 2023097854 W CN2023097854 W CN 2023097854W WO 2024001663 A1 WO2024001663 A1 WO 2024001663A1
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WO
WIPO (PCT)
Prior art keywords
bus
full
load
voltage
bus load
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/CN2023/097854
Other languages
English (en)
French (fr)
Inventor
胡斌
龙谭
周宏明
黄招彬
章文凯
颜小君
张杰楠
韦东
毕然
徐云松
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.)
GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
Original Assignee
GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GD Midea Air Conditioning Equipment Co Ltd, Foshan Shunde Midea Electric Science and Technology Co Ltd filed Critical GD Midea Air Conditioning Equipment Co Ltd
Priority to EP23829848.3A priority Critical patent/EP4496161A4/en
Publication of WO2024001663A1 publication Critical patent/WO2024001663A1/zh
Priority to US19/000,946 priority patent/US20250132563A1/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
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Arrangements for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/14—Arrangements for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, the networks, e.g. progressively balanced loading
    • 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
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H02J1/08—Three-wire DC power distribution systems; Systems having more than three wires
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input 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
    • 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
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H02M7/219—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 in a bridge configuration
    • 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
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • 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
    • H02J2105/00—Networks for supplying or distributing electric power characterised by their spatial reach or by the load
    • H02J2105/40—Networks for supplying or distributing electric power characterised by their spatial reach or by the load characterised by the loads connecting to the networks or being supplied by the networks
    • H02J2105/42—Home appliances
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches

Definitions

  • the present disclosure relates to the technical field of home appliance control, and in particular to a full busbar load discharge control method and related devices in home appliances.
  • three-phase power can be converted into DC power.
  • overvoltage is likely to occur. phenomenon, which will lead to damage to the circuit or load equipment, and in severe cases, even a fire, involving the user's personal and property safety.
  • one purpose of the present disclosure is to propose a full bus load discharge control method in home appliances, which can stabilize the bus voltage, thereby avoiding overvoltage or undervoltage, and improving the service life and use of home appliances. safety.
  • a second object of the present disclosure is to provide a computer-readable storage medium.
  • the third object of the present disclosure is to provide a power control board for home appliances.
  • the fourth object of the present disclosure is to provide a home appliance.
  • the present disclosure proposes a full bus load discharge control method in home appliances, wherein the home appliances include a three-level active PFC (Power Factor Correction) unit, a full bus load and a half Bus load, the three-level active PFC unit includes an upper half bus capacitor and a lower half bus capacitor connected in series between the positive terminal of the DC bus and the negative terminal of the DC bus.
  • the home appliances include a three-level active PFC (Power Factor Correction) unit, a full bus load and a half Bus load
  • the three-level active PFC unit includes an upper half bus capacitor and a lower half bus capacitor connected in series between the positive terminal of the DC bus and the negative terminal of the DC bus.
  • the upper half bus capacitor and the lower half bus capacitor The node between them is the midpoint of the DC bus, and the three-level active PFC unit is used to transform the input three-phase power to pass through the positive terminal of the DC bus, the negative terminal of the DC bus and the DC bus
  • the midpoint outputs a first DC power and a second DC power, the first DC power is used to power the full bus load, and the second DC power is used to power the half bus load.
  • the method includes: When the bus load is turned off and the half bus load is in working state, it is determined that the third The voltage difference between the direct current and the second direct current; controlling the full bus load to turn on or off according to the voltage difference to stabilize the half bus voltage in a preset voltage range.
  • the full bus load discharge control method in the home appliance of this embodiment first determines that only the half bus load among the full bus load and the half bus load is in the working state, then determines the voltage difference between the first direct current and the second direct current. Obtain the voltage difference, where the first DC power and the second DC power are obtained by converting the three-phase power supply through the three-phase level active PFC unit. After determining the voltage difference between the first DC power and the second DC power, according to the voltage The difference controls the full bus load to turn on or off, so that the half bus voltage stabilizes within the preset voltage range. Therefore, the full bus load discharge control method in the home appliance in this embodiment can stabilize the bus voltage, thereby avoiding overvoltage or undervoltage, and improving the service life and safety of the home appliance.
  • the voltage difference when the second DC power is output from the DC bus midpoint and the DC bus negative terminal, the voltage difference is between the DC bus positive terminal and the DC bus midpoint.
  • the voltage difference is the voltage between the midpoint of the DC bus and the negative terminal of the DC bus.
  • controlling the full bus load to turn on or off according to the voltage difference includes: determining The first half bus voltage reference value; controlling the full bus load to be turned on and adjusting the full bus load so that the voltage difference is equal to the first half bus voltage reference value.
  • controlling the full bus load to turn on or off according to the voltage difference includes: When the voltage difference is greater than or equal to the first preset voltage threshold, the full bus load is controlled to be turned on to discharge the upper half bus capacitor, until the voltage difference is less than or equal to the second preset voltage threshold, all bus loads are controlled to be turned on. The full bus load is turned off to charge the upper half bus capacitor, wherein the first preset voltage threshold is greater than the second preset voltage threshold.
  • controlling the full bus load to turn on or off according to the voltage difference includes: determining The second half bus voltage reference value; controlling the full bus load to turn on and adjusting the full bus load so that the voltage difference is equal to the second half bus voltage reference value.
  • controlling the full bus load to turn on or off according to the voltage difference includes: When the voltage difference is greater than or equal to the third preset voltage threshold, the full bus load is controlled to be turned on to discharge the lower half bus capacitor, until the voltage difference is less than or equal to the fourth preset voltage threshold, all bus loads are controlled to be turned on. The full bus load is turned off to charge the lower half bus capacitor, wherein the third preset voltage threshold is greater than the fourth preset voltage threshold.
  • the full bus load is a compressor
  • the half bus load is a DC fan
  • the second embodiment of the present disclosure proposes a computer-readable storage medium on which a full bus load discharge control program in a home appliance is stored, and the full bus load discharge control program in the home appliance is executed by a processor.
  • the computer-readable storage medium in the embodiment of the present disclosure uses the processor to execute the full bus load discharge control program in the home appliance stored thereon, and can perform voltage stabilization control on the bus voltage, thereby avoiding overvoltage or undervoltage phenomena, and improving The service life and safety of household appliances.
  • the third embodiment of the present disclosure proposes a power control board for home appliances.
  • the power control board includes a memory, a processor, and all busbars in the home appliances that are stored in the memory and can be run on the processor.
  • Load discharge control program when the processor executes the full bus load discharge control program in the home appliance, the full bus load discharge control method in the home appliance according to the above embodiment is implemented.
  • the power control board of the home appliance in the embodiment of the present disclosure includes a memory and a processor.
  • the processor executes the full bus load discharge control program in the home appliance stored on the memory, and can perform voltage stabilization control on the bus voltage to avoid overvoltage or overvoltage. Under-voltage phenomenon improves the service life and safety of household appliances.
  • the fourth embodiment of the present disclosure proposes a home appliance.
  • the home appliance includes a full bus load, a half bus load and a power control board.
  • the power control board includes a three-level active PFC unit and a control unit.
  • the three-level active PFC unit includes an upper half bus capacitor and a lower half bus capacitor connected in series between the positive terminal of the DC bus and the negative terminal of the DC bus.
  • the upper half bus capacitor and the lower half bus capacitor are The node between is the midpoint of the DC bus, and the three-level active PFC unit is used to transform the input three-phase power supply to pass through the positive terminal of the DC bus, the negative terminal of the DC bus and the middle point of the DC bus.
  • the point outputs a first DC power and a second DC power
  • the first DC power is used to power the full bus load
  • the second DC power is used to power the half bus load
  • the control unit is used to power the full bus load.
  • the voltage difference between the first direct current and the second direct current is determined.
  • After determining the voltage difference between the first DC power and the second DC power, according to the voltage controls the full bus load to turn on or off, so that the half bus voltage stabilizes within the preset voltage range. Therefore, the home appliance in this embodiment can perform voltage stabilization control on the bus voltage, thereby avoiding overvoltage or undervoltage, and improving the service life and safety of the home appliance.
  • Figure 1 is a flow chart of a full bus load discharge control method in home appliances according to an embodiment of the present disclosure
  • Figure 2 is a circuit schematic diagram of a home appliance according to an embodiment of the present disclosure
  • Figure 3 is a schematic diagram of the connection relationship of the switch tubes in the power module according to a specific embodiment of the present disclosure
  • Figure 4 is a circuit schematic diagram of a home appliance according to another embodiment of the present disclosure.
  • Figure 5 is a flow chart of a full bus load discharge control method in home appliances according to another embodiment of the present disclosure.
  • Figure 6 is a flow chart of a full bus load discharge control method in home appliances according to another embodiment of the present disclosure.
  • Figure 7 is a circuit schematic diagram of a home appliance according to another embodiment of the present disclosure.
  • Figure 8 is a circuit schematic diagram of a home appliance according to another embodiment of the present disclosure.
  • Figure 9 is a structural block diagram of a power control board of a home appliance according to an embodiment of the present disclosure.
  • FIG. 10 is a structural block diagram of a home appliance according to an embodiment of the present disclosure.
  • Figure 1 is a flow chart of a full bus load discharge control method in home appliances according to an embodiment of the present disclosure.
  • the present disclosure proposes a full bus load discharge control method in home appliances, where the home appliances include a three-level active PFC unit, a full bus load and a half bus load.
  • the home appliances include a three-level active PFC unit 11, a full bus load 12 and a half bus load 13.
  • the three-level active PFC unit 11 includes a DC bus positive terminal P and a DC bus negative terminal connected in series.
  • the upper half bus capacitor C1 and the lower half bus capacitor C2 between N, the node between the upper half bus capacitor C1 and the lower half bus capacitor C2 is the DC bus midpoint O, and the three-level active PFC unit 11 is used for input
  • the three-phase power supply is transformed to output the first DC power and the second DC power through the DC bus positive terminal P, the DC bus negative terminal N and the DC bus midpoint O.
  • the first DC power is used to power the full bus load 12, and the second DC power is Used to supply power to half bus load 13.
  • the three-phase power can be converted into direct current after being processed by the three-level active PFC unit 11, and can be output from the positive terminal P of the DC bus, the negative terminal N of the DC bus, and the midpoint O of the DC bus, specifically from the positive terminal of the DC bus.
  • the first DC power is output from P and the negative terminal N of the DC bus
  • the second DC power is output from the midpoint O of the DC bus and the positive terminal P of the DC bus
  • the second DC power is output from the midpoint O of the DC bus and the negative terminal N of the DC bus.
  • the bus where the positive terminal P of the DC bus is located is the positive bus
  • the bus where the negative terminal N of the DC bus is located is the negative bus.
  • the bus connected to the positive terminal The load between the bus and the negative bus is a full bus load 12, while the load connected between the midpoint O of the DC bus and the positive bus or the negative bus is a half bus load 13.
  • the three-level active PFC unit 11 in this embodiment includes: a first inductor L1, a second inductor L2, a third inductor L3, a three-phase rectifier bridge, a first power module, The second power module and the third power module.
  • one end of the first inductor L1, one end of the second inductor L2 and one end of the third inductor L3 are respectively used as three-phase input terminals; the first input terminal of the three-phase rectifier bridge is connected to the other end of the first inductor L1, and the three-phase The second input end of the rectifier bridge is connected to the other end of the second inductor L2, the third input end of the three-phase rectifier bridge is connected to the other end of the third inductor L3; one end of the first power module is connected to the first end of the three-phase rectifier bridge.
  • the input ends are connected, one end of the second power module is connected to the second input end of the three-phase rectifier bridge, one end of the third power module is connected to the third input end of the three-phase rectifier bridge, and the other end of the first power module and the second The other end of the power module and the other end of the third power module are connected together to form the first node P1, which is connected to the DC bus midpoint O; the positive terminal of the upper half bus capacitor C1 is connected to the DC bus positive terminal P Connected and connected to the first output end of the three-phase rectifier bridge, the negative terminal of the upper half bus capacitor C1 is connected to the positive terminal of the second electrolytic capacitor C2, and the negative terminal of the lower half bus capacitor C2 is connected to the negative terminal N of the DC bus. Connect to the second output end of the three-phase rectifier bridge.
  • the first inductor L1, the second inductor L2 and the third inductor L3 in the three-level active PFC unit 11 are respectively used to connect to the three-phase power supply. That is to say, the first inductor L1 , each end of the second inductor L2 and the third inductor L3 can be used as a three-phase input end of the three-level active PFC unit 11, and the three-phase power is input to the three-level active PFC unit 11 from the three-phase input end. Specifically, after passing through the first to third inductors, the three-phase power supply can enter the three-phase rectifier bridge for rectification.
  • the three-phase rectifier bridge includes three groups of diodes connected in parallel.
  • Each group of diodes includes two diodes connected in series in the same direction.
  • the first group of diodes includes a first diode D1 and a second diode.
  • Diode D2 the second group of diodes includes a third diode D3 and a fourth diode D4, and the third group of diodes includes a fifth diode D5 and a sixth diode D6.
  • the anode of the first diode D1 is connected to the cathode of the second diode D2
  • the anode of the third diode D3 is connected to the cathode of the fourth diode D4
  • the anode of the fifth diode D5 is connected to the cathode of the fourth diode D4.
  • the cathode of the six diode D6 is connected, the cathode of the first diode D1, the cathode of the third diode D3 and the cathode of the fifth diode D5 are connected together, the anode of the second diode D2,
  • the anode of the fourth diode D4 and the anode of the sixth diode D6 are connected together.
  • connection node between the first diode D1 and the second diode D2 serves as the first input terminal of the three-phase rectifier bridge, and the first input terminal is connected to the other end of the first inductor L1; the third diode D3
  • connection node between the fourth diode D4 and the fourth diode D4 serves as the second input terminal of the three-phase rectifier bridge, and the second input terminal is connected to the other end of the second inductor L2;
  • connection node between D6 serves as the third input terminal of the three-phase rectifier bridge, and the third input terminal is connected to the other end of the third inductor L3.
  • the diode in this embodiment is a fast recovery diode with a withstand voltage of 1200 volts, or it can be implemented by using an IGBT (Insulated Gate Bipolar Transistor) with an anti-parallel diode.
  • IGBT Insulated Gate Bipolar Transistor
  • the three-level active PFC unit 11 also includes a first to a third group of power modules, where the first group of power modules includes a first switching tube T1 and a second switching tube T2, and the second group of power modules includes a third switch.
  • the third group of power modules includes a fifth switching transistor T5 and a sixth switching transistor T6. More specifically, in some embodiments, the first switching transistor T1 and the second switching transistor T2 in the first group of power modules are connected in reverse series, and the third switching transistor T3 and the fourth switching transistor T4 in the second group of power modules are connected in reverse series. In reverse series connection, the fifth switching transistor T5 and the sixth switching transistor T6 in the third group of power modules are connected in reverse series.
  • Each emitter of the first switching tube T1, the third switching tube T3 and the fifth switching tube T5 is respectively connected to the three input terminals of the three-phase rectifier bridge, or each of the third switching tube T3 and the fifth switching tube T5
  • the collector is connected to the three input terminals of the three-phase rectifier bridge respectively; and the emitters of the second switch T2, the fourth switch T4 and the sixth switch T6 are connected together to form the first node P1, or the The collectors of the second switch T2, the fourth switch T4 and the sixth switch T6 are connected together to form the first node P1.
  • two switching tubes included in each power module can be connected together in an anti-parallel manner, such as the emitter of the third switching tube T3 and the fourth switching tube.
  • the collector of T4 is connected, and the collector of the third switching tube T3 is connected with the emitter of the fourth switching tube T3.
  • the power module can be made bidirectionally conductive or bidirectional by controlling the two switching tubes. Block. As shown in Figure 3, if the gate levels of the third switching tube T3 and the fourth switching tube T4 are given conduction driving signals at the same time, the corresponding power module can be controlled to be bidirectionally conductive; and if the third switching tube T3 and the fourth switching tube T4 are simultaneously given conduction The gate level of the switch tube T4 is used to turn off the driving signal, and the corresponding power module can be controlled to be blocked in both directions.
  • the switch tube in this embodiment can be an IGBT with a withstand voltage of 650 volts.
  • the full bus load discharge control method in this embodiment is completed based on the above-described embodiment. Specifically, referring to Figure 1, the full bus load discharge control method in this embodiment includes the following steps:
  • the voltage difference between the first direct current and the second direct current is determined, where,
  • the first direct current is the power supply that supplies the full bus load 12
  • the second direct current is the power supply that supplies the half bus load 13 .
  • the pressure difference in this embodiment also has two ways of determining.
  • the voltage difference is the voltage between the DC bus midpoint O and the DC bus negative terminal N. See Figure 2 for details, in which half bus load 13 is connected exist Between the midpoint O of the DC bus and the positive terminal P of the DC bus, that is, the first DC power is output by the positive terminal P of the DC bus and the negative terminal N of the DC bus, and the second DC power is output by the positive terminal P of the DC bus and the midpoint O of the DC bus. output, the voltage difference between the first DC and the second DC is equal to the voltage between the midpoint O of the DC bus and the negative terminal N of the DC bus.
  • the voltage difference is the voltage between the DC bus positive terminal P and the DC bus midpoint O, see Figure 4, where the half bus load 13 is connected to Between the midpoint O of the DC bus and the negative terminal N of the DC bus, that is, the first DC power is output by the positive terminal P of the DC bus and the negative terminal N of the DC bus, and the second DC power is output by the negative terminal N of the DC bus and the midpoint O of the DC bus. output, the voltage difference between the first DC and the second DC is equal to the voltage between the positive terminal P of the DC bus and the midpoint O of the DC bus.
  • the full bus load can be further controlled based on the voltage difference.
  • the operating electrical parameters of the full bus load can be controlled, such as operating power, voltage, current, etc. . Since turning on or off the full bus load can have a certain impact on the bus voltage, for example, turning on can reduce the voltage, and turning off can increase the voltage. Therefore, by controlling the turning on or off of the full bus load, the half bus voltage can be stabilized within the preset voltage range. .
  • controlling the full bus load to turn on or off according to the voltage difference includes the following steps:
  • the second DC power is output from the DC bus midpoint O and the DC bus negative terminal N.
  • This embodiment first determines the first half bus voltage reference value V1_ref.
  • the first half bus voltage reference value V1_ref It can be the reference value of the lower half bus voltage, that is, the voltage reference value between the midpoint O of the DC bus and the negative terminal N of the DC bus.
  • the two are compared, and the full bus load is adjusted according to the comparison results. Among them, the power, current, voltage and other information of the full bus load can be adjusted.
  • the discharge state of the upper half bus capacitor can be controlled, and then the voltage difference can be adjusted so that the voltage difference is equal to the first half bus voltage reference value V1_ref to ensure the half bus load Able to work in optimal condition.
  • the full bus load 12 is controlled to be turned on to discharge the upper half bus capacitor C1, thereby completing the DC bus midpoint O and the DC bus negative
  • the voltage between extreme N is reduced to make the voltage difference equal to or close to the first half bus voltage reference value V1_ref to prevent the half bus load 13 from overloading. Failure occurred due to pressure work.
  • the full bus load 12 is controlled to be closed to reduce the capacitance of the upper half bus.
  • C1 is charged to complete the step-up process of the voltage between the DC bus midpoint O and the DC bus negative terminal N, so that the voltage difference is equal to or close to the first half bus voltage reference value V1_ref to ensure the half bus load 13 Can work normally.
  • controlling the entire bus load to turn on or off according to the voltage difference includes: when the voltage difference is greater than or equal to the first preset voltage threshold, controlling The full bus load 12 is turned on to discharge the upper half bus capacitor C1. When the voltage difference is less than or equal to the second preset voltage threshold, the full bus load 12 is controlled to be closed to charge the upper half bus capacitor C1. Among them, the first The preset voltage threshold is greater than the second preset voltage threshold.
  • the second DC power is output from the DC bus midpoint O and the DC bus negative terminal N.
  • this embodiment first determines A first preset voltage threshold and a second preset voltage threshold, where the first preset voltage threshold is greater than the second preset voltage threshold.
  • the first preset voltage threshold may be 260 volts
  • the second preset voltage threshold may be 200 volts.
  • the voltage difference is compared with the first preset voltage threshold.
  • the full bus load 12 is controlled to be turned on to discharge the upper half bus capacitor C1, thereby completing the connection between the DC bus midpoint O and the DC bus negative terminal N.
  • the voltage between the busbars is reduced to prevent the half bus load 13 from overvoltage and failure.
  • the full bus load 12 is controlled to be closed to charge the upper half bus capacitor C1 , thereby completing the voltage boosting process between the DC bus midpoint O and the DC bus negative terminal N to ensure that the half bus load 13 can operate normally.
  • the voltage difference after determining the voltage difference, the first preset voltage threshold and the second preset voltage threshold, there is no limitation that the voltage difference must first be compared with the first preset voltage threshold or the second preset voltage threshold. The comparison may be performed simultaneously, that is, after obtaining the voltage difference, it may be determined whether the voltage difference is greater than or equal to the first preset voltage threshold or less than or equal to the second preset voltage threshold.
  • controlling the full bus load to turn on or off according to the voltage difference includes the following steps:
  • the second DC power is output from the DC bus positive terminal P and the DC bus midpoint O.
  • This embodiment first determines the second half bus voltage reference value V2_ref.
  • the second half bus voltage reference value V2_ref It can be the reference value of the upper half bus voltage, that is, the voltage reference value between the positive terminal P of the DC bus and the midpoint O of the DC bus.
  • the two are compared, and the full bus load is adjusted according to the comparison results. Among them, the power, current, voltage and other information of the full bus load can be adjusted.
  • the discharge state of the lower half bus capacitor can be controlled, and then the voltage difference can be adjusted so that the voltage difference is equal to the second half bus voltage reference value V2_ref to ensure the half bus load. Able to work in optimal condition.
  • the full bus load 12 is controlled to be turned on to discharge the lower half bus capacitor C2, thereby completing the connection between the DC bus positive terminal P and the DC bus center
  • the voltage between points O is reduced to make the voltage difference equal to or close to the second half bus voltage reference value V2_ref to prevent the half bus load 13 from overvoltage operation and failure.
  • the full bus load 12 is controlled to be closed to reduce the capacitance of the lower half bus.
  • C2 is charged to complete the boosting process of the voltage between the DC bus positive terminal P and the DC bus midpoint O, so that the voltage difference is equal to or close to the second half bus voltage reference value V2_ref to ensure the half bus load 13 Can work normally.
  • controlling the entire bus load to turn on or off according to the voltage difference includes: when the voltage difference is greater than or equal to the third preset voltage threshold, controlling The full bus load 12 is turned on to discharge the lower half bus capacitor C2. When the voltage difference is less than or equal to the fourth preset voltage threshold, the full bus load 12 is controlled to be closed to charge the lower half bus capacitor C2. The third The preset voltage threshold is greater than the fourth preset voltage threshold.
  • the second DC power is output from the DC bus positive terminal P and the DC bus midpoint O.
  • this embodiment first determines A third preset voltage threshold and a fourth preset voltage threshold, wherein the third preset voltage threshold is greater than the fourth preset voltage threshold.
  • the third preset voltage threshold may be 260 volts
  • the fourth preset voltage threshold may be 200 volts.
  • the voltage difference is compared with the third preset voltage threshold.
  • the full bus load 12 is controlled to be turned on to discharge the lower half bus capacitor C2, thereby completing the connection between the DC bus positive terminal P and the DC bus midpoint O.
  • the voltage between the busbars is reduced to prevent the half bus load 13 from overvoltage and failure.
  • the full bus load 12 is controlled to be closed to charge the lower half bus capacitor C2, thereby completing the step-up process of the voltage between the DC bus positive terminal P and the DC bus midpoint O to ensure that the half Bus load 13 can operate normally.
  • the voltage difference after determining the voltage difference, the third preset voltage threshold and the fourth preset voltage threshold, there is no limitation that the voltage difference must first be compared with the third preset voltage threshold or the fourth preset voltage threshold. The comparison may be performed simultaneously, that is, after obtaining the voltage difference, it may be determined whether the voltage difference is greater than or equal to the third preset voltage threshold or less than or equal to the fourth preset voltage threshold.
  • the full bus load 12 is a compressor
  • the half bus load 13 is a DC fan
  • the full bus load 12 in this embodiment can be a compressor, and the compressor is controlled to turn on or off through an IPM (Intelligent Power Module), and the half bus load 13 can be a compressor.
  • DC fan and also controls the DC fan to turn on or off through IPM.
  • the power supply voltage of the DC fan can be adjusted by controlling the opening and closing of the compressor to prevent the DC fan from overvoltage operation.
  • the half bus load 13 in this embodiment may include multiple DC fans, and the multiple DC fans are correspondingly provided with IPMs to control their opening and closing.
  • the full bus load 12 may also include multiple compressors (not shown in the figure). The control method of the circuit shown in Figure 8 is also controlled according to the control method described in the above embodiment, and will not be described again.
  • the full bus load discharge control method of the embodiment of the present disclosure first determines that only the half bus load among the full bus load and the half bus load is in the working state, then determines the voltage difference between the first direct current and the second direct current. To obtain the voltage difference, where the first DC power and the second DC power are converted from the three-phase power supply through the three-phase level active PFC unit. After determining the voltage difference between the first DC power and the second DC power, according to The voltage difference controls the full bus load to turn on or off, so that the half bus voltage stabilizes within the preset voltage range. Therefore, through the full bus load discharge control method in the home appliance in this embodiment, the bus voltage can be stabilized and controlled, thereby avoiding overvoltage or undervoltage and improving the service life and safety of the home appliance.
  • the present disclosure proposes a computer-readable storage medium on which a full-bus load discharge control program in a home appliance is stored.
  • the full-bus load discharge control program in the home appliance is executed by a processor, the home appliance described in the above embodiments is implemented.
  • Central full bus load discharge control method When the full-bus load discharge control program in the home appliance is executed by a processor, the home appliance described in the above embodiments is implemented. Central full bus load discharge control method.
  • the computer-readable storage medium in the embodiment of the present disclosure uses the processor to execute the full bus load discharge control program in the home appliance stored thereon, and can perform voltage stabilization control on the bus voltage, thereby avoiding overvoltage or undervoltage phenomena, and improving The service life and safety of household appliances.
  • FIG. 9 is a structural block diagram of a power control board of a home appliance according to an embodiment of the present disclosure.
  • the present disclosure proposes a power control board 90 for home appliances.
  • the power control board 90 includes a memory 91 , a processor 92 , and home appliances stored in the memory 91 and capable of running on the processor 92
  • the full bus load discharge control program when the processor 92 executes the full bus load discharge control program in the home appliance, implements the full bus load discharge control method in the home appliance according to the above embodiment.
  • the power control board of the home appliance in the embodiment of the present disclosure includes a memory and a processor.
  • the processor executes the full bus load discharge control program in the home appliance stored on the memory, and can perform voltage stabilization control on the bus voltage to avoid overvoltage or overvoltage. Under-voltage phenomenon improves the service life and safety of household appliances.
  • FIG. 10 is a structural block diagram of a home appliance according to an embodiment of the present disclosure.
  • the present disclosure proposes a home appliance 100 , which includes a full bus load 12 , a half bus load 13 and a power control board 10 .
  • the power control board 10 includes a three-level active PFC unit and a control unit.
  • the three-level active PFC unit includes an upper half bus capacitor and a lower half bus capacitor connected in series between the positive terminal of the DC bus and the negative terminal of the DC bus. The node between the upper half bus capacitor and the lower half bus capacitor is the midpoint of the DC bus.
  • the three-level active PFC unit is used to convert the input three-phase power to pass the positive terminal of the DC bus, the negative terminal of the DC bus and the DC bus.
  • the bus midpoint outputs the first DC power and the second DC power.
  • the first DC power is used to power the full bus load 12, and the second DC power is used to power the half bus load 13.
  • the control unit is used to turn off the full bus load 12 and half the bus load 13. When the load 13 is in the working state, the voltage difference between the first DC and the second DC is determined, and the full bus load 12 is controlled to be turned on or off according to the voltage difference to stabilize the half bus voltage within a preset voltage range
  • the voltage difference between the first direct current and the second direct current is determined.
  • After determining the voltage difference between the first DC power and the second DC power, according to the voltage controls the full bus load to turn on or off, so that the half bus voltage stabilizes within the preset voltage range. Therefore, the home appliance in this embodiment can perform voltage stabilization control on the bus voltage, thereby avoiding overvoltage or undervoltage, and improving the service life and safety of the home appliance.
  • the voltage difference when the second DC power is output from the midpoint of the DC bus and the negative terminal of the DC bus, the voltage difference is the voltage between the positive terminal of the DC bus and the midpoint of the DC bus; when the second DC power is output from the midpoint of the DC bus and When the positive terminal of the DC bus is output, the voltage difference is the voltage between the midpoint of the DC bus and the negative terminal of the DC bus.
  • the control unit when the second DC power is output from the DC bus midpoint and the DC bus negative terminal, is specifically configured to: determine the first half bus voltage reference value; when the voltage difference is greater than the first half bus voltage reference value , controls the full bus load to turn on to discharge the upper half bus capacitor; when the voltage difference is less than the first half bus voltage reference value, controls the full bus load to turn off to charge the upper half bus capacitor.
  • control unit when the second DC power is output from the midpoint of the DC bus and the negative terminal of the DC bus, the control unit is specifically configured to: when the voltage difference is greater than or equal to the first preset voltage threshold, control all bus loads to turn on, so as to The upper half bus capacitor is discharged until the voltage difference is less than or equal to the second preset voltage threshold, and all bus loads are controlled to be turned off to charge the upper half bus capacitor, where the first preset voltage threshold is greater than the second preset voltage threshold.
  • the control unit when the second DC power is output from the DC bus midpoint and the DC bus positive terminal, is specifically configured to: determine the second half bus voltage reference value; when the voltage difference is greater than the second half bus voltage reference value , controls the full bus load to turn on to discharge the lower half bus capacitor; when the voltage difference is less than the second half bus voltage reference value, controls the full bus load to turn off to charge the lower half bus capacitor.
  • the control unit when the second DC power is output from the midpoint of the DC bus and the positive terminal of the DC bus, the control unit is specifically configured to: when the voltage difference is greater than or equal to the third preset voltage threshold, control all bus loads to turn on, so as to The lower half bus capacitor is discharged until the voltage difference is less than or equal to the fourth preset voltage threshold, and all bus loads are controlled to be turned off to charge the lower half bus capacitor, where the third preset voltage threshold is greater than the fourth preset voltage threshold.
  • the full bus load is a compressor and the half bus load is a DC fan.
  • the home appliances can perform voltage stabilization and control on the bus voltage, thereby avoiding overvoltage or undervoltage and improving the service life and safety of the home appliances.

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Abstract

一种家电设备中全母线负载放电控制方法及相关装置，其中，家电设备中全母线负载放电控制方法首先在确定全母线负载和半母线负载中只有半母线负载处于工作状态时，则对第一直流电和第二直流电之间的电压差进行确定以得到压差，其中，第一直流电和第二直流电是三相电源通过三相电平有源PFC单元之后转换得到的，在确定第一直流电和第二直流电之间的压差之后，则根据压差控制全母线负载开启或者关闭，使得半母线电压稳定在预设电压区间。

Description

家电设备中全母线负载放电控制方法及相关装置
相关申请的交叉引用
本申请要求于2022年06月29日提交的申请号为202210764682.8，名称为“家电设备中全母线负载放电控制方法及相关装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及家电设备控制技术领域，尤其是涉及一种家电设备中全母线负载放电控制方法及相关装置。
背景技术
随着电力电网的发展，使用三相电的设备越来越多，且三相电的使用也越来越安全。
在一些直流负载的使用中，可以将三相电转换为直流电，但是由于三相电源的电压较高，如果将其转换为直流电使用之后，而不对其电压进行控制的话，则很可能出现过压现象，进而导致电路或负载设备的损坏，严重时甚至发生火灾，涉及到用户的人身财产安全。
公开内容
本公开旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本公开的一个目的在于提出一种家电设备中全母线负载放电控制方法，能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
本公开的第二个目的在于提出一种计算机可读存储介质。
本公开的第三个目的在于提出一种家电设备的电源控制板。
本公开的第四个目的在于提出一种家电设备。
为达上述目的，本公开提出了一种家电设备中全母线负载放电控制方法，其中，所述家电设备包括三电平有源PFC(Power Factor Correction，功率因数校正)单元、全母线负载和半母线负载，所述三电平有源PFC单元包括串联在直流母线正极端和直流母线负极端之间的上半母线电容和下半母线电容，所述上半母线电容与所述下半母线电容之间的节点为直流母线中点，所述三电平有源PFC单元用于对输入的三相电源进行变换，以通过所述直流母线正极端、所述直流母线负极端和所述直流母线中点输出第一直流电和第二直流电，所述第一直流电用于给所述全母线负载供电，所述第二直流电用于给所述半母线负载供电，所述方法包括：在所述全母线负载关闭、且所述半母线负载处于工作状态时，确定所述第 一直流电与所述第二直流电之间的压差；根据所述压差控制所述全母线负载开启或关闭，以使半母线电压稳定在预设电压区间。
本实施例的家电设备中全母线负载放电控制方法首先在确定全母线负载和半母线负载中只有半母线负载处于工作状态时，则对第一直流电和第二直流电之间的电压差进行确定以得到压差，其中，第一直流电和第二直流电是三相电源通过三相电平有源PFC单元之后转换得到的，在确定第一直流电和第二直流电之间的压差之后，则根据压差控制全母线负载开启或者关闭，使得半母线电压稳定在预设电压区间。由此，本实施例中的家电设备中全母线负载放电控制方法能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
在本公开的一些实施例中，在所述第二直流电由所述直流母线中点和所述直流母线负极端输出时，所述压差为所述直流母线正极端与所述直流母线中点之间的电压；在所述第二直流电由所述直流母线中点和所述直流母线正极端输出时，所述压差为所述直流母线中点与所述直流母线负极端之间的电压。
在本公开的一些实施例中，在所述第二直流电由所述直流母线中点和所述直流母线负极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：确定第一半母线电压参考值；控制所述全母线负载开启并对所述全母线负载进行调节，以使所述压差与所述第一半母线电压参考值相等。
在本公开的一些实施例中，在所述第二直流电由所述直流母线中点和所述直流母线负极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：在所述压差大于等于第一预设电压阈值时，控制所述全母线负载开启，以对所述上半母线电容进行放电，直至所述压差小于等于第二预设电压阈值时，控制所述全母线负载关闭，以对所述上半母线电容进行充电，其中，所述第一预设电压阈值大于所述第二预设电压阈值。
在本公开的一些实施例中，在所述第二直流电由所述直流母线中点和所述直流母线正极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：确定第二半母线电压参考值；控制所述全母线负载开启并对所述全母线负载进行调节，以使所述压差与所述第二半母线电压参考值相等。
在本公开的一些实施例中，在所述第二直流电由所述直流母线中点和所述直流母线正极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：在所述压差大于等于第三预设电压阈值时，控制所述全母线负载开启，以对所述下半母线电容进行放电，直至所述压差小于等于第四预设电压阈值时，控制所述全母线负载关闭，以对所述下半母线电容进行充电，其中，所述第三预设电压阈值大于所述第四预设电压阈值。
在本公开的一些实施例中，所述全母线负载为压缩机，所述半母线负载为直流风机。
为达上述目的，本公开第二方面实施例提出了一种计算机可读存储介质，其上存储有家电设备中全母线负载放电控制程序，该家电设备中全母线负载放电控制程序被处理器执行时实现上述实施例所述的家电设备中全母线负载放电控制方法。
本公开实施例的计算机可读存储介质通过处理器执行存储在其上的家电设备中全母线负载放电控制程序，能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
为达上述目的，本公开第三方面实施例提出了一种家电设备的电源控制板，该电源控制板包括存储器、处理器及存储在存储器上并可在处理器上运行的家电设备中全母线负载放电控制程序，所述处理器执行所述家电设备中全母线负载放电控制程序时，实现根据上述实施例所述的家电设备中全母线负载放电控制方法。
本公开实施例的家电设备的电源控制板包括存储器和处理器，处理器执行存储在存储器上的家电设备中全母线负载放电控制程序，能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
为达上述目的，本公开第四方面实施例提出了一种家电设备，该家电设备包括全母线负载、半母线负载和电源控制板，所述电源控制板包括三电平有源PFC单元和控制单元，所述三电平有源PFC单元包括串联在直流母线正极端和直流母线负极端之间的上半母线电容和下半母线电容，所述上半母线电容与所述下半母线电容之间的节点为直流母线中点，所述三电平有源PFC单元用于对输入的三相电源进行变换，以通过所述直流母线正极端、所述直流母线负极端和所述直流母线中点输出第一直流电和第二直流电，所述第一直流电用于给所述全母线负载供电，所述第二直流电用于给所述半母线负载供电，所述控制单元用于在所述全母线负载关闭、且所述半母线负载处于工作状态时，确定所述第一直流电与所述第二直流电之间的压差，并根据所述压差控制所述全母线负载开启或关闭，以使半母线电压稳定在预设电压区间。
本公开实施例的家电设备通过电源控制板中的控制单元确定全母线负载和半母线负载中只有半母线负载处于工作状态时，则对第一直流电和第二直流电之间的电压差进行确定以得到压差，其中，第一直流电和第二直流电是三相电源通过三相电平有源PFC单元之后转换得到的，在确定第一直流电和第二直流电之间的压差之后，则根据压差控制全母线负载开启或者关闭，使得半母线电压稳定在预设电压区间。由此，本实施例中的家电设备能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
本公开附加的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，或通过本公开的实践了解到。
附图说明
图1是根据本公开一个实施例的家电设备中全母线负载放电控制方法流程图；
图2是根据本公开一个实施例的家电设备的电路示意图；
图3是根据本公开一个具体实施例的功率模块中开关管的连接关系示意图；
图4是根据本公开另一个实施例的家电设备的电路示意图；
图5是根据本公开另一个实施例的家电设备中全母线负载放电控制方法流程图；
图6是根据本公开又一个实施例的家电设备中全母线负载放电控制方法流程图；
图7是根据本公开另一个实施例的家电设备的电路示意图；
图8是根据本公开另一个实施例的家电设备的电路示意图；
图9是根据本公开实施例的家电设备的电源控制板结构框图；
图10是根据本公开实施例的家电设备的结构框图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
下面参考附图描述本公开实施例的家电设备中全母线负载放电控制方法及相关装置。
图1是根据本公开一个实施例的家电设备中全母线负载放电控制方法流程图。
如图1所示，本公开提出了一种家电设备中全母线负载放电控制方法，其中，家电设备包括有三电平有源PFC单元、全母线负载和半母线负载。具体如图2所示，家电设备包括三电平有源PFC单元11、全母线负载12和半母线负载13，三电平有源PFC单元11包括串联在直流母线正极端P和直流母线负极端N之间的上半母线电容C1和下半母线电容C2，上半母线电容C1与下半母线电容C2之间的节点为直流母线中点O，三电平有源PFC单元11用于对输入的三相电源进行变换，以通过直流母线正极端P、直流母线负极端N和直流母线中点O输出第一直流电和第二直流电，第一直流电用于给全母线负载12供电，第二直流电用于给半母线负载13供电。
具体地，三相电源在经过三电平有源PFC单元11处理之后可以转换为直流电，可以从直流母线正极端P、直流母线负极端N和直流母线中点O输出，具体从直流母线正极端P和直流母线负极端N中输出第一直流电，从直流母线中点O和直流母线正极端P中输出第二直流电或者从直流母线中点O和直流母线负极端N中输出第二直流电。可以理解的是，直流母线正极端P所在的母线为正母线，直流母线负极端N所在的母线为负母线，连接在正 母线和负母线之间的负载为全母线负载12，而在连接在直流母线中点O与正母线或者负母线之间的负载则为半母线负载13。
更具体地，如图2所示，本实施例中的三电平有源PFC单元11包括：第一电感L1、第二电感L2、第三电感L3、三相整流桥、第一功率模块、第二功率模块和第三功率模块。
其中，第一电感L1的一端、第二电感L2的一端和第三电感L3的一端分别作为三相输入端；三相整流桥的第一输入端与第一电感L1的另一端相连，三相整流桥的第二输入端与第二电感L2的另一端相连，三相整流桥的第三输入端与第三电感L3的另一端相连；第一功率模块的一端与三相整流桥的第一输入端相连，第二功率模块的一端与三相整流桥的第二输入端相连，第三功率模块的一端与三相整流桥的第三输入端相连，第一功率模块的另一端、第二功率模块的另一端和第三功率模块的另一端连接到一起，以形成第一节点P1，第一节点P1与直流母线中点O相连；上半母线电容C1的正极端与直流母线正极端P相连且连接至三相整流桥的第一输出端，上半母线电容C1的负极端与第二电解电容C2的正极端相连，下半母线电容C2的负极端与直流母线负极端N相连且连接至三相整流桥的第二输出端相连。
具体地，如图2所示，三电平有源PFC单元11中的第一电感L1、第二电感L2和第三电感L3分别用于与三相电源连接，也就是说，第一电感L1、第二电感L2和第三电感L3中的各一端可以作为三电平有源PFC单元11的三相输入端，三相电源从这三相输入端中输入到三电平有源PFC单元11中，三相电源具体在经过第一至第三电感之后，可以进入到三相整流桥中进行整流。
更具体地，参见图2，三相整流桥包括三组相互并联的二极管，每组二极管包括有两个同向串联的二极管，如第一组二极管包括第一二极管D1和第二二极管D2，第二组二极管包括第三二极管D3和第四二极管D4，第三组二极管包括第五二极管D5和第六二极管D6。其中，第一二极管D1的阳极与第二二极管D2的阴极连接，第三二极管D3的阳极与第四二极管D4的阴极连接，第五二极管D5的阳极和第六二极管D6的阴极连接，第一二极管D1的阴极、第三二极管D3的阴极和第五二极管D5的阴极三者连接到一起，第二二极管D2的阳极、第四二极管D4的阳极和第六二极管D6的阳极三者连接到一起。
第一二极管D1与第二二极管D2之间的连接节点作为三相整流桥的第一输入端，且第一输入端与第一电感L1的另一端连接；第三二极管D3和第四二极管D4之间的连接节点作为三相整流桥的第二输入端，且第二输入端与第二电感L2的另一端连接；第五二极管D5和第六二极管D6之间的连接节点作为三相整流桥的第三输入端，且第三输入端与第三电感L3的另一端连接。
优选地，本实施例中的二极管选取为1200伏耐压的快恢复二极管，或者可以利用具有反并联二极管的IGBT(Insulated Gate Bipolar Transistor，绝缘栅双极型晶体管)代替实现。
三电平有源PFC单元11还包括有第一组至第三组功率模块，其中，第一组功率模块包括第一开关管T1和第二开关管T2，第二组功率模块包括第三开关管T3和第四开关管T4，第三组功率模块包括第五开关管T5和第六开关管T6。更具体地，在一些实施例中，第一组功率模块中的第一开关管T1和第二开关管T2反向串联，第二组功率模块中的第三开关管T3和第四开关管T4反向串联，第三组功率模块中的第五开关管T5和第六开关管T6反向串联。第一开关管T1、第三开关管T3和第五开关管T5中的各发射极分别与三相整流桥的三个输入端相连，或者第三开关管T3和第五开关管T5中的各集电极分别与三相整流桥的三个输入端相连；而第二开关管T2、第四开关管T4和第六开关管T6中的各发射极则连接到一起形成第一节点P1，或者第二开关管T2、第四开关管T4和第六开关管T6中的各集电极连接到一起形成第一节点P1。
而在另外的一些实施例中，如图3所示，各个功率模块中所包括的两个开关管可以以反向并联的方式连接一起，如第三开关管T3的发射极与第四开关管T4的集电极连接，第三开关管T3的集电极与第四开关管T3的发射极连接。
需要说明的是，无论是两个开关管反向串联组成的功率模块，还是两个开关管反向并联组成的功率模块，通过对两个开关管的控制都可以使得功率模块双向导通或双向阻断。如参见图3，同时给第三开关管T3和第四开关管T4的门级以导通驱动信号，则可以控制对应的功率模块双向导通；而如果同时给第三开关管T3和第四开关管T4的门级以关断驱动信号，则可以控制对应的功率模块双向阻断。
优选地，本实施例中的开关管可选用650伏耐压的IGBT。
本实施例中的全母线负载放电控制方法基于上述描述的实施例完成的，具体地，参见图1，本实施例中的全母线负载放电控制方法包括以下步骤：
S10，在全母线负载关闭、且半母线负载处于工作状态时，确定第一直流电与第二直流电之间的压差。
具体地，如图2所示，在本实施例中的全母线负载12关闭不工作，同时半母线负载13开启工作的时候，对第一直流电和第二直流电之间压差进行确定，其中，第一直流电是给全母线负载12供电的电源，第二直流电是给半母线负载13供电的电源。
由于半母线负载13可以有两中连接方式连接到母线中，所以本实施例中的压差也具有两种确定方式。在第二直流电由直流母线中点O和直流母线正极端P输出时，压差为直流母线中点O与直流母线负极端N之间的电压，具体参见图2，其中，半母线负载13连接在 直流母线中点O和直流母线正极端P之中，即第一直流电是由直流母线正极端P和直流母线负极端N输出的，第二直流电是由直流母线正极端P和直流母线中点O输出的，则第一直流电和第二直流电之间的压差则等于直流母线中点O与直流母线负极端N之间的电压。
在第二直流电由直流母线中点O和直流母线负极端N输出时，压差为直流母线正极端P与直流母线中点O之间的电压，参见图4，其中，半母线负载13连接在直流母线中点O和直流母线负极端N之中，即第一直流电是由直流母线正极端P和直流母线负极端N输出的，第二直流电是由直流母线负极端N和直流母线中点O输出的，则第一直流电和第二直流电之间的压差则等于直流母线正极端P与直流母线中点O之间的电压。
S20，根据压差控制全母线负载开启或关闭，以使半母线电压稳定在预设电压区间。
具体地，在确定第一直流电和第二直流电的压差之后，则可以进一步根据该压差对全母线负载进行控制，具体可以控制全母线负载的运行电参数，例如运行功率、电压、电流等。由于全母线负载开启或者关闭能够对母线电压造成一定的影响，如开启可以降低电压，关闭可以提升电压，所以通过对全母线负载的开启或关闭控制，能够使半母线电压稳定在预设电压区间。
在一些实施例中，在第二直流电由直流母线中点和直流母线负极端输出时，如图5所示，根据压差控制全母线负载开启或关闭，包括以下步骤：
S501，确定第一半母线电压参考值。
S502，控制全母线负载开启并对全母线负载进行调节，以通过对上半母线电容进行充放电使压差与第一半母线电压参考值相等。
具体地，参见图4和图5，第二直流电从直流母线中点O和直流母线负极端N输出，本实施例首先确定第一半母线电压参考值V1_ref，该第一半母线电压参考值V1_ref可以是下半母线电压的参考值，即直流母线中点O和直流母线负极端N之间的电压参考值。在确定压差和第一半母线电压参考值V1_ref之后，则对两者进行比较，并根据比较结果对全母线负载进行调节，其中，可以调节全母线负载的功率、电流和电压等信息，可以理解的是，通过对全母线负载进行调节，能够对上半母线电容的放电状态进行控制，进而对压差进行调节，使得压差与第一半母线电压参考值V1_ref相等，以保证半母线负载能够工作在较佳的状态。
需要说明的是，在一些实施例中，在确定压差和第一半母线电压参考值V1_ref之后，则对两者进行比较，并在压差大于第一半母线电压参考值V1_ref的时候，则表示此时半母线负载13的供电电压较大，可能存在过压的风险，所以控制全母线负载12开启，以对上半母线电容C1进行放电，从而完成对直流母线中点O和直流母线负极端N之间的电压进行降压处理，以使压差与第一半母线电压参考值V1_ref相等或接近，防止半母线负载13过 压作业而出现故障。在压差小于第一半母线电压参考值V1_ref的时候，则表示此时半母线负载13的供电电压较小，可能存在供电不足的风险，所以控制全母线负载12关闭，以对上半母线电容C1进行充电，从而完成对直流母线中点O和直流母线负极端N之间的电压进行升压处理，以使压差与第一半母线电压参考值V1_ref相等或接近，以保证半母线负载13能够正常作业。
在一些实施例中，在第二直流电由直流母线中点和直流母线负极端输出时，根据压差控制全母线负载开启或关闭，包括：在压差大于等于第一预设电压阈值时，控制全母线负载12开启，以对上半母线电容C1进行放电，直至压差小于等于第二预设电压阈值时，控制全母线负载12关闭，以对上半母线电容C1进行充电，其中，第一预设电压阈值大于第二预设电压阈值。
具体地，参见图4，第二直流电从直流母线中点O和直流母线负极端N输出，本实施例为了控制第一直流电与第二直流电之间的压差在预设电压区间内，首先确定第一预设电压阈值和第二预设电压阈值，其中第一预设电压阈值大于第二预设电压阈值，举例，第一预设电压阈值可以为260伏，第二预设电压阈值可以为200伏。在确定压差、第一预设电压阈值和第二预设电压阈值之后，则将压差与第一预设电压阈值进行比较，在压差大于等于第一预设电压阈值时，则表示当前半母线负载13的供电电压较大，可能存在过压的风险，所以控制全母线负载12开启，以对上半母线电容C1进行放电，从而完成对直流母线中点O和直流母线负极端N之间的电压进行降压处理，防止半母线负载13过压作业而出现故障。在压差小于等于第二预设电压阈值时，则表示当前半母线负载13的供电电压较小，可能存在供电不足的风险，所以控制全母线负载12关闭，以对上半母线电容C1进行充电，从而完成对直流母线中点O和直流母线负极端N之间的电压进行升压处理，以保证半母线负载13能够正常作业。
需要说明的是，本实施例在确定压差、第一预设电压阈值和第二预设电压阈值之后，并没有限定必须先将压差与第一预设电压阈值或者第二预设电压阈值进行比较，而可以是同时比较的，即在获取到压差之后，则可以判断该压差是否大于等于第一预设电压阈值或者小于等于第二预设电压阈值。
在一些实施例中，在第二直流电由直流母线中点和直流母线正极端输出时，如图6所示，根据压差控制全母线负载开启或关闭，包括以下步骤：
S601，确定第二半母线电压参考值。
S602，控制全母线负载开启并对全母线负载进行调节，以使压差与第二半母线电压参考值相等。
具体地，参见图2和图6，第二直流电从直流母线正极端P和直流母线中点O输出，本实施例首先确定第二半母线电压参考值V2_ref，该第二半母线电压参考值V2_ref可以是上半母线电压的参考值，即直流母线正极端P和直流母线中点O之间的电压参考值。在确定压差和第二半母线电压参考值V2_ref之后，则对两者进行比较，并根据比较结果对全母线负载进行调节，其中，可以调节全母线负载的功率、电流和电压等信息，可以理解的是，通过对全母线负载进行调节，能够对下半母线电容的放电状态进行控制，进而对压差进行调节，使得压差与第二半母线电压参考值V2_ref相等，以保证半母线负载能够工作在较佳的状态。
需要说明的是，在一些实施例中，在确定压差和第二半母线电压参考值V2_ref之后，则对两者进行比较，并在压差大于第二半母线电压参考值V2_ref的时候，则表示此时半母线负载13的供电电压较大，可能存在过压的风险，所以控制全母线负载12开启，以对下半母线电容C2进行放电，从而完成对直流母线正极端P和直流母线中点O之间的电压进行降压处理，以使压差与第二半母线电压参考值V2_ref相等或接近，防止半母线负载13过压作业而出现故障。在压差小于第二半母线电压参考值V2_ref的时候，则表示此时半母线负载13的供电电压较小，可能存在供电不足的风险，所以控制全母线负载12关闭，以对下半母线电容C2进行充电，从而完成对直流母线正极端P和直流母线中点O之间的电压进行升压处理，以使压差与第二半母线电压参考值V2_ref相等或接近，以保证半母线负载13能够正常作业。
在一些实施例中，在第二直流电由直流母线中点和直流母线正极端输出时，根据压差控制全母线负载开启或关闭，包括：在压差大于等于第三预设电压阈值时，控制全母线负载12开启，以对下半母线电容C2进行放电，直至压差小于等于第四预设电压阈值时，控制全母线负载12关闭，以对下半母线电容C2进行充电，其中，第三预设电压阈值大于第四预设电压阈值。
具体地，参见图2，第二直流电从直流母线正极端P和直流母线中点O输出，本实施例为了控制第一直流电与第二直流电之间的压差在预设电压区间内，首先确定第三预设电压阈值和第四预设电压阈值，其中第三预设电压阈值大于第四预设电压阈值，举例，第三预设电压阈值可以为260伏，第四预设电压阈值可以为200伏。在确定压差、第三预设电压阈值和第四预设电压阈值之后，则将压差与第三预设电压阈值进行比较，在压差大于等于第三预设电压阈值时，则表示当前半母线负载13的供电电压较大，可能存在过压的风险，所以控制全母线负载12开启，以对下半母线电容C2进行放电，从而完成对直流母线正极端P和直流母线中点O之间的电压进行降压处理，防止半母线负载13过压作业而出现故障。在压差小于等于第四预设电压阈值时，则表示当前半母线负载13的供电电压较小，可能存 在供电不足的风险，所以控制全母线负载12关闭，以对下半母线电容C2进行充电，从而完成对直流母线正极端P和直流母线中点O之间的电压进行升压处理，以保证半母线负载13能够正常作业。
需要说明的是，本实施例在确定压差、第三预设电压阈值和第四预设电压阈值之后，并没有限定必须先将压差与第三预设电压阈值或者第四预设电压阈值进行比较，而可以是同时比较的，即在获取到压差之后，则可以判断该压差是否大于等于第三预设电压阈值或者小于等于第四预设电压阈值。
在一些实施例中，如图7所示，全母线负载12为压缩机，半母线负载13为直流风机。
具体地，如图7所示，本实施例中的全母线负载12可以为压缩机，并且通过IPM(Intelligent Power Module，智能功率模块)控制压缩机开启或关闭，半母线负载13则可以为我直流风机，并且也通过IPM控制直流风机开启或关闭。在直流风机工作且压缩机不工作的时候，可以通过对压缩机的启闭控制来调节直流风机的供电电压，以防止直流风机过压作业。
在另一些实施例中，如图8所述，本实施例中的半母线负载13可以包括多个直流风机，且多个直流风机都对应设置有IPM控制其启闭，当然，在其他实施例中，全母线负载12也是可以包括有多个压缩机的(图中未示出)。图8所示的电路的控制方法也是根据上述实施例所述的控制方法进行控制的，再次不进行赘述。
综上，本公开实施例的全母线负载放电控制方法首先在确定全母线负载和半母线负载中只有半母线负载处于工作状态时，则对第一直流电和第二直流电之间的电压差进行确定以得到压差，其中，第一直流电和第二直流电是三相电源通过三相电平有源PFC单元之后转换得到的，在确定第一直流电和第二直流电之间的压差之后，则根据压差控制全母线负载开启或者关闭，使得半母线电压稳定在预设电压区间。由此，通过本实施例中的家电设备中全母线负载放电控制方法，能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
本公开提出了一种计算机可读存储介质，其上存储有家电设备中全母线负载放电控制程序，该家电设备中全母线负载放电控制程序被处理器执行时实现上述实施例所述的家电设备中全母线负载放电控制方法。
本公开实施例的计算机可读存储介质通过处理器执行存储在其上的家电设备中全母线负载放电控制程序，能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
图9是根据本公开实施例的家电设备的电源控制板结构框图。
如图9所示，本公开提出了一种家电设备的电源控制板90，该电源控制板90包括存储器91、处理器92及存储在存储器91上并可在处理器92上运行的家电设备中全母线负载放电控制程序，处理器92执行家电设备中全母线负载放电控制程序时，实现根据上述实施例的家电设备中全母线负载放电控制方法。
本公开实施例的家电设备的电源控制板包括存储器和处理器，处理器执行存储在存储器上的家电设备中全母线负载放电控制程序，能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
图10是根据本公开实施例的家电设备的结构框图。
如图10所示，本公开提出了一种家电设备100，该家电设备100包括全母线负载12、半母线负载13和电源控制板10。
其中，电源控制板10包括三电平有源PFC单元和控制单元，三电平有源PFC单元包括串联在直流母线正极端和直流母线负极端之间的上半母线电容和下半母线电容，上半母线电容与下半母线电容之间的节点为直流母线中点，三电平有源PFC单元用于对输入的三相电源进行变换，以通过直流母线正极端、直流母线负极端和直流母线中点输出第一直流电和第二直流电，第一直流电用于给全母线负载12供电，第二直流电用于给半母线负载13供电，控制单元用于在全母线负载12关闭、且半母线负载13处于工作状态时，确定第一直流电与第二直流电之间的压差，并根据压差控制全母线负载12开启或关闭，以使半母线电压稳定在预设电压区间。
本公开实施例的家电设备通过电源控制板中的控制单元确定全母线负载和半母线负载中只有半母线负载处于工作状态时，则对第一直流电和第二直流电之间的电压差进行确定以得到压差，其中，第一直流电和第二直流电是三相电源通过三相电平有源PFC单元之后转换得到的，在确定第一直流电和第二直流电之间的压差之后，则根据压差控制全母线负载开启或者关闭，使得半母线电压稳定在预设电压区间。由此，本实施例中的家电设备能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
在一些实施例中，在第二直流电由直流母线中点和直流母线负极端输出时，压差为直流母线正极端与直流母线中点之间的电压；在第二直流电由直流母线中点和直流母线正极端输出时，压差为直流母线中点与直流母线负极端之间的电压。
在一些实施例中，在第二直流电由直流母线中点和直流母线负极端输出时，控制单元具体用于：确定第一半母线电压参考值；在压差大于第一半母线电压参考值时，控制全母线负载开启，以对上半母线电容进行放电；在压差小于第一半母线电压参考值时，控制全母线负载关闭，以对上半母线电容进行充电。
在一些实施例中，在第二直流电由直流母线中点和直流母线负极端输出时，控制单元具体用于：在压差大于等于第一预设电压阈值时，控制全母线负载开启，以对上半母线电容进行放电，直至压差小于等于第二预设电压阈值时，控制全母线负载关闭，以对上半母线电容进行充电，其中，第一预设电压阈值大于第二预设电压阈值。
在一些实施例中，在第二直流电由直流母线中点和直流母线正极端输出时，控制单元具体用于：确定第二半母线电压参考值；在压差大于第二半母线电压参考值时，控制全母线负载开启，以对下半母线电容进行放电；在压差小于第二半母线电压参考值时，控制全母线负载关闭，以对下半母线电容进行充电。
在一些实施例中，在第二直流电由直流母线中点和直流母线正极端输出时，控制单元具体用于：在压差大于等于第三预设电压阈值时，控制全母线负载开启，以对下半母线电容进行放电，直至压差小于等于第四预设电压阈值时，控制全母线负载关闭，以对下半母线电容进行充电，其中，第三预设电压阈值大于第四预设电压阈值。
在一些实施例中，全母线负载为压缩机，半母线负载为直流风机。
需要说明的是，本公开实施例的家电设备的具体实施例方式，可以参见上述实施例中的家电设备中全母线负载放电控制方法的具体实施公式，在此不再赘述。
综上，本公开实施例的家电设备能够对母线电压进行稳压控制，从而避免出现过压或欠压现象，提高了家电设备的使用寿命和使用安全性。
另外，本公开实施例的家电设备的其他构成及作用对本领域的技术人员来说是已知的，为减少冗余，此处不做赘述。
尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (10)

  1. 一种家电设备中全母线负载放电控制方法，其中，所述家电设备包括三电平有源PFC单元、全母线负载和半母线负载，所述三电平有源PFC单元包括串联在直流母线正极端和直流母线负极端之间的上半母线电容和下半母线电容，所述上半母线电容与所述下半母线电容之间的节点为直流母线中点，所述三电平有源PFC单元用于对输入的三相电源进行变换，以通过所述直流母线正极端、所述直流母线负极端和所述直流母线中点输出第一直流电和第二直流电，所述第一直流电用于给所述全母线负载供电，所述第二直流电用于给所述半母线负载供电，所述方法包括：
    在所述全母线负载关闭、且所述半母线负载处于工作状态时，确定所述第一直流电与所述第二直流电之间的压差；
    根据所述压差控制所述全母线负载开启或关闭，以使半母线电压稳定在预设电压区间。
  2. 根据权利要求1所述的方法，其中，
    在所述第二直流电由所述直流母线中点和所述直流母线负极端输出时，所述压差为所述直流母线正极端与所述直流母线中点之间的电压；
    在所述第二直流电由所述直流母线中点和所述直流母线正极端输出时，所述压差为所述直流母线中点与所述直流母线负极端之间的电压。
  3. 根据权利要求2所述的方法，其中，在所述第二直流电由所述直流母线中点和所述直流母线负极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：
    确定第一半母线电压参考值；
    控制所述全母线负载开启并对所述全母线负载进行调节，以使所述压差与所述第一半母线电压参考值相等。
  4. 根据权利要求2所述的方法，其中，在所述第二直流电由所述直流母线中点和所述直流母线负极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：
    在所述压差大于等于第一预设电压阈值时，控制所述全母线负载开启，以对所述上半母线电容进行放电，直至所述压差小于等于第二预设电压阈值时，控制所述全母线负载关闭，以对所述上半母线电容进行充电，其中，所述第一预设电压阈值大于所述第二预设电压阈值。
  5. 根据权利要求2所述的方法，其中，在所述第二直流电由所述直流母线中点和所述直流母线正极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：
    确定第二半母线电压参考值；
    控制所述全母线负载开启并对所述全母线负载进行调节，以使所述压差与所述第二半母 线电压参考值相等。
  6. 根据权利要求2所述的方法，其中，在所述第二直流电由所述直流母线中点和所述直流母线正极端输出时，根据所述压差控制所述全母线负载开启或关闭，包括：
    在所述压差大于等于第三预设电压阈值时，控制所述全母线负载开启，以对所述下半母线电容进行放电，直至所述压差小于等于第四预设电压阈值时，控制所述全母线负载关闭，以对所述下半母线电容进行充电，其中，所述第三预设电压阈值大于所述第四预设电压阈值。
  7. 根据权利要求1-6中任一项所述的方法，其中，所述全母线负载为压缩机，所述半母线负载为直流风机。
  8. 一种计算机可读存储介质，其上存储有家电设备中全母线负载放电控制程序，该家电设备中全母线负载放电控制程序被处理器执行时实现根据权利要求1-7中任一项所述的家电设备中全母线负载放电控制方法。
  9. 一种家电设备的电源控制板，包括存储器、处理器及存储在存储器上并可在处理器上运行的家电设备中全母线负载放电控制程序，所述处理器执行所述家电设备中全母线负载放电控制程序时，实现根据权利要求1-7中任一项所述的家电设备中全母线负载放电控制方法。
  10. 一种家电设备，包括：
    全母线负载和半母线负载；
    电源控制板，所述电源控制板包括三电平有源PFC单元和控制单元，所述三电平有源PFC单元包括串联在直流母线正极端和直流母线负极端之间的上半母线电容和下半母线电容，所述上半母线电容与所述下半母线电容之间的节点为直流母线中点，所述三电平有源PFC单元用于对输入的三相电源进行变换，以通过所述直流母线正极端、所述直流母线负极端和所述直流母线中点输出第一直流电和第二直流电，所述第一直流电用于给所述全母线负载供电，所述第二直流电用于给所述半母线负载供电，所述控制单元用于在所述全母线负载关闭、且所述半母线负载处于工作状态时，确定所述第一直流电与所述第二直流电之间的压差，并根据所述压差控制所述全母线负载开启或关闭，以使半母线电压稳定在预设电压区间。
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