WO2022242135A1 - Système de conversion de puissance, appareil de conversion de puissance et procédé de commande associé - Google Patents

Système de conversion de puissance, appareil de conversion de puissance et procédé de commande associé Download PDF

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Publication number
WO2022242135A1
WO2022242135A1 PCT/CN2021/138257 CN2021138257W WO2022242135A1 WO 2022242135 A1 WO2022242135 A1 WO 2022242135A1 CN 2021138257 W CN2021138257 W CN 2021138257W WO 2022242135 A1 WO2022242135 A1 WO 2022242135A1
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Prior art keywords
input
power conversion
dcdc
circuit
conversion device
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PCT/CN2021/138257
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English (en)
Chinese (zh)
Inventor
陈鹏
孙帅
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阳光电源股份有限公司
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Publication of WO2022242135A1 publication Critical patent/WO2022242135A1/fr

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    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the present application relates to the technical field of power conversion, in particular to a power conversion system, a power conversion device and a control method thereof.
  • MPPT Maximum Power Point Tracking, maximum power point tracking
  • the DCDC conversion circuit as the MPPT unit is usually implemented by a boost circuit.
  • the multi-channel boost in the photovoltaic inverter in the prior art mostly adopts the input-output common-negative pole structure shown in FIG. 1 , or the input-output common-pole structure shown in FIG. 2 .
  • the corresponding boost circuit When the photovoltaic input voltage is high, the corresponding boost circuit can be bypassed by its bypass unit, so that the conversion efficiency of the circuit can be improved.
  • the boost circuit works to provide energy that meets the voltage requirements for the subsequent stage; however, when the voltage is low, the inductor ripple in the boost circuit is large, and the conversion efficiency of the circuit is not high.
  • the present application provides a power conversion system, a power conversion device and a control method thereof, so as to improve conversion efficiency.
  • the first aspect of the embodiment of the present application provides a power conversion device, including: a control unit, at least two DCDC conversion circuits and at least one switch unit controlled by the control unit; wherein:
  • each of the DCDC conversion circuits are respectively connected to corresponding input power sources, and the output ends of each of the DCDC conversion circuits are connected in parallel;
  • At least one of the DCDC conversion circuits has an input-output common positive structure, and at least one of the DCDC conversion circuits has an input-output common negative structure;
  • the negative pole of the input terminal of at least one input-output common-positive structure of the DCDC conversion circuit is connected to the positive pole of the input terminal of at least one input-output common-negative pole structure of the DCDC conversion circuit through the corresponding switch unit.
  • each of the DCDC conversion circuits is connected to another DCDC conversion circuit through their corresponding switching units.
  • one or more DCDC conversion circuits are respectively connected to both sides of each switch unit.
  • the switch unit includes:
  • At least one of relays, contactors, semiconductor switch tubes and diodes At least one of relays, contactors, semiconductor switch tubes and diodes.
  • the DCDC conversion circuit includes: an input capacitor, an output capacitor and a main circuit;
  • the input capacitor is set on the input side of the main circuit, and the output capacitor is set on the output side of the main circuit.
  • the DCDC conversion circuit includes: a buck circuit, a boost circuit or a buck-boost circuit.
  • each of the DCDC conversion circuits is further provided with its own bypass unit.
  • it also includes: a DCAC conversion circuit
  • the DC side of the DCAC conversion circuit is connected to the output end of each DCDC conversion circuit through a DC bus.
  • control unit includes: a master controller and slave controllers of each of the DCDC conversion circuits;
  • Each of the slave controllers is communicatively connected to the master controller.
  • the main controller is: a system controller; or,
  • the main controller is: a controller of the DCAC conversion circuit.
  • Another aspect of the present application also provides a control method of a power conversion device, which is applied to the control unit of the power conversion device as described in any of the above paragraphs, and the control method includes:
  • judging whether each of the DCDC conversion circuits on both sides of the same switch unit in the power conversion device meets a preset low input condition includes:
  • each of the DCDC conversion circuits on both sides of the same switch unit in the power conversion device satisfies a preset low input condition, it further includes:
  • the preset low voltage conditions include:
  • the second threshold is smaller than the first threshold.
  • the normal operating conditions include:
  • the second threshold is smaller than the first threshold.
  • the third aspect of the present application further provides a power conversion system, including: at least two input power sources, and the power conversion device as described in any of the above paragraphs.
  • the power conversion device is: a DC combiner box without a DCAC conversion circuit, or a string inverter with a DCAC conversion circuit.
  • the input power source is: a photovoltaic module, a photovoltaic string or an energy storage battery.
  • the input terminals of each DCDC conversion circuit inside are respectively connected to the corresponding input power supply, and the output terminals are connected in parallel; among them, at least one DCDC conversion circuit has an input-output common positive structure, and at least one other DCDC conversion circuit
  • the circuit has an input-output common-negative pole structure; and, at least one input-output common-positive structure DCDC conversion circuit negative pole is connected to at least one input-output common-negative structure DCDC conversion circuit input positive pole through a corresponding switch unit; Therefore, when the voltage of the input power supply is low, the switch unit can be turned on, so that the input power supplies on both sides are connected in series, and at the same time, because of the structural settings of the DCDC conversion circuits on both sides, both will be bypassed, In order to improve the conversion efficiency of the device and reduce the heating of the circuit.
  • Fig. 1 and Fig. 2 are the structural representations of two kinds of photovoltaic inverters provided by the prior art
  • FIG. 3 and Figure 4 are partial structural schematic diagrams of the power conversion device provided by the embodiment of the present application.
  • Fig. 5 is a schematic structural diagram of a power conversion device provided by an embodiment of the present application.
  • FIG. 6 is a specific structural diagram of a power conversion device provided in an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of another power conversion device provided by the embodiment of the present application.
  • Fig. 8 is a flowchart of a control method for a power conversion device provided by an embodiment of the present application.
  • the term "comprises”, “comprises” or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus.
  • an element defined by the phrase “comprising a " does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.
  • the present application provides a power conversion device, as shown in FIG. 5 , including: a control unit (not shown in the figure), at least two DCDC conversion circuits 101 and at least one switch unit K1 controlled by the control unit; wherein:
  • each DCDC conversion circuit 101 The input ends of each DCDC conversion circuit 101 are respectively connected to corresponding input power sources (input power source 1 and input power source 2 as shown in FIG. 5 ), and the output ends of each DCDC conversion circuit 101 are connected in parallel to the output circuit shown in FIG. 1 both ends.
  • At least one DCDC conversion circuit 101 has an input-output common-positive structure (as shown in FIG. 3 ), and at least one DCDC conversion circuit 101 has an input-output common-negative structure (as shown in FIG. 4 ).
  • the input-output common positive pole structure means that the positive pole of the input side and the positive pole of the output side of the circuit are connected together or at the same potential; and the common negative pole structure of the input and output means that the negative pole of the input side of the circuit is connected with the negative pole of the output side. Together or equipotentially.
  • the negative pole of the input terminal of at least one DCDC conversion circuit 101 with common positive input and output structure is connected to the positive pole of the input terminal of at least one DCDC conversion circuit 101 with common negative pole input and output structure through the corresponding switch unit K1. That is to say, at least one DCDC conversion circuit 101 is respectively connected to both sides of each switch unit K1.
  • two or more DCDC conversion circuits 101 can be connected; when two or more DCDC conversion circuits 101 are connected to one side, each DCDC conversion circuit 101 is connected in parallel.
  • only one DCDC conversion circuit 101 of corresponding structure may be provided on one side, or at least two DCDC conversion circuits 101 connected in parallel may be provided, and the same is true on the other side.
  • each DCDC conversion circuit 101 Since the input ends of each DCDC conversion circuit 101 are respectively connected to corresponding input power sources, that is to say, at least one input power source is respectively connected to both sides of each switch unit K1.
  • the two sides of each switch unit K1 are respectively connected to One input power supply (input power supply 1 and input power supply 2 as shown in Figure 5) is shown as an example; when at least two input power supplies are connected to one side of it, each input power supply is connected in parallel.
  • Each switch unit K1 and all the input power sources connected to both sides together form a series structure, and all DCDC conversion circuits 101 in the power conversion device can form at least one such series structure after being connected by the switch unit K1.
  • all DCDC conversion circuits 101 in the power conversion device may be connected to corresponding switch units K1, so that all DCDC conversion circuits 101 are respectively paired according to different types of structures; there may also be one or a few remaining DCDC
  • the conversion circuit 101 is not connected to the corresponding switch unit K1; there is no specific limitation here, it may depend on the application environment, and all are within the protection scope of the present application.
  • the above-mentioned power conversion device provided in this embodiment is configured through the above-mentioned structure.
  • the independent operation of the corresponding DCDC conversion circuit 101 will cause its internal inductance ripple to be large and the conversion efficiency is low.
  • the corresponding switch unit K1 is turned on, so that the input power sources on both sides are connected in series, so that the input voltages on both sides are connected in series to obtain a higher voltage value, that is, the input voltage is equivalently increased, which can be used in the DCDC conversion circuit 101 Powers the output circuit when inactive.
  • the switching unit The DCDC conversion circuits 101 on both sides of K1 are in bypass mode. Compared with the situation without switch unit K1 in the prior art, this embodiment can improve the working efficiency of the circuit and reduce the heating of the circuit.
  • each switch unit K1 can basically realize on-off control at the same time, that is, when each DCDC conversion circuit 101 is connected to a corresponding switch unit K1, each DCDC The conversion circuit 101 can be switched close to the bypass state when the switch unit K1 is turned on or the independent operation state when the switch unit K1 is turned off at the same time.
  • special circumstances such as shading are considered, there may be a large difference in the output parameters of the input power connected to both sides of the same switch unit K1.
  • priority can be given to ensuring MPPT, that is, the independent operation state of the DCDC conversion circuit 101 on both sides is retained; only when the voltages of the input power sources on both sides are lower than the threshold value, it is controlled to be turned on, so that The DCDC conversion circuits 101 on both sides are bypassed to improve the conversion efficiency and reduce the heat generation of the circuit; or, it is also possible to improve the conversion efficiency as a priority, that is, as long as one of the voltages of the input power sources connected to the same switch unit K1 is lower than the above-mentioned
  • the switching unit K1 is controlled to be turned on; it depends on the specific application environment, all of which are within the protection scope of the present application.
  • the switching unit K1 can be: one of relays, contactors, diodes, and semiconductor switching tubes such as IGBTs or MOSFETs, or any combination of types and numbers, There is no specific limitation here, as long as the on-off function of the series connection between corresponding input power sources can be realized, all are within the protection scope of the present application.
  • the DCDC conversion circuit 101 includes an input capacitor (such as Cin described in FIG. 3 and FIG. 4 and Cin1 and Cin2 described in FIG. 5), an output capacitor (such as shown in FIG. 3 and FIG. Co described in 4 and Co1 and Co2 described in Figure 5) and main circuits (such as the main circuit described in Figure 3 and Figure 4 and the main circuit 1 and main circuit 2 described in Figure 5);
  • the main circuit can be: a buck circuit, a boost circuit (including Q1, L1 and D1 shown in Figure 6, or Q2, L2 and D2), a buck-boost circuit or other similar conversion circuits, which are not specifically limited here , depending on the application environment, all within the protection scope of the present application.
  • each DCDC conversion circuit 101 should be provided with its own bypass unit (not shown), so as to bypass the main circuit in the DCDC conversion circuit 101 when the voltage of its input power supply is high. , thereby increasing the conversion efficiency.
  • bypass unit for the specific implementation manner of the bypass unit, reference may be made to the prior art, and details are not repeated here.
  • the power conversion device when the power conversion device includes at least two DCDC conversion circuits 101 whose output ends are connected in parallel, the power conversion device can be used as a combiner box, such as a photovoltaic string combiner box, an energy storage battery combiner box, and the like.
  • the power conversion device can also be shown in Figure 7 (shown on the basis of Figure 5 as an example), that is, it further includes: a DCAC conversion circuit 102; the DC side of the DCAC conversion circuit 102, through The DC bus is connected to the output terminals of each DCDC conversion circuit 101; at this time, the power conversion device can be used as a photovoltaic inverter or an energy storage converter.
  • control unit that controls the actions of each switch unit K1 and each DCDC conversion circuit 101 may be an integrated controller, and may also include: a master controller and slave controllers of each DCDC conversion circuit 101; each slave controller All communicate with the master controller; each slave controller controls the action of the corresponding DCDC conversion circuit 101, and each slave controller forms a DCDC converter with the corresponding DCDC conversion circuit 101 and its required voltage/current detection module;
  • the main controller is mainly used to control the actions of each switch unit K1.
  • the master controller can be: a system controller; if the power conversion device does not include a DCAC conversion circuit 102, each slave controller is directly connected to the system controller by communication; if the power conversion device includes a DCAC conversion circuit 102 102, each slave controller may be communicatively connected to the system controller and the controller of the DCAC conversion circuit 102, or may be communicatively connected to the system controller through the controller of the DCAC conversion circuit 102.
  • the main controller is: the controller of the DCAC conversion circuit 102, and is responsible for the operation control of the DCAC conversion circuit 102 and the operation control of each switch unit K1.
  • control unit In actual application, the specific settings of the control unit may depend on the application environment, and all are within the scope of protection of this application.
  • Another embodiment of the present application also provides a control method for a power conversion device, which is applied to the control unit of the power conversion device in any of the above-mentioned embodiments.
  • a control method for a power conversion device which is applied to the control unit of the power conversion device in any of the above-mentioned embodiments.
  • the structure and working principle of the power conversion device please refer to the above-mentioned embodiments. ,No longer.
  • control method includes:
  • control unit such as an integrated controller, or each slave controller inside the control unit can detect the input voltage of the corresponding DCDC conversion circuit through the voltage detection module on the input side of each DCDC conversion circuit; its input voltage , that is, the voltage of the input power supply connected to its input side. After each slave controller obtains the detection value of each input voltage, it sends it to the master controller.
  • the control unit such as an integrated controller, or a main controller inside the control unit, judges the specific conditions of each input power supply.
  • the preset low input condition may specifically mean that there is at least one input voltage satisfying the preset low voltage condition among the input voltages of all DCDC conversion circuits, that is, when the voltage difference between the input power sources on both sides is large, the priority is to ensure MPPT ; Or, it can also mean that the input voltages of all DCDC conversion circuits meet the preset low voltage condition, that is, when the voltage difference of the input power supply on both sides is large, the priority is to improve the conversion efficiency; no specific limitation is made here , depending on the application environment, all within the protection scope of the present application.
  • step S103 is executed.
  • the switch unit After the switch unit is turned on, the input power sources on both sides are connected in series, and the DCDC conversion circuits on both sides are bypassed, thereby reducing the conversion efficiency and heat generation of the device.
  • control method further includes:
  • the integrated controller or the main controller after obtaining the detection values of each input voltage, will also consider whether it can make the corresponding DCDC conversion circuit perform chopping work at a conversion efficiency that meets the requirements when judging its size. For example, if MPPT works, it is judged whether it can operate normally. If yes, there is no need to turn on the switch unit, and each DCDC conversion circuit can directly perform chopping work.
  • the bypass unit of the corresponding DCDC conversion circuit will be automatically turned on, thereby improving the conversion efficiency.
  • control unit controlling the action of each switch unit may be a control with a hysteresis; that is, preferably:
  • the preset low voltage condition includes: not rising above the first threshold, or falling below the second threshold; the second threshold is smaller than the first threshold.
  • the normal operating condition includes: the value has risen to be greater than the first threshold, or has not fallen to be less than the second threshold; the second threshold is less than the first threshold.
  • the switch unit when the light is weak every morning, the voltage of each input power source, that is, the input voltage of each DCDC conversion circuit, gradually rises from zero.
  • the switch unit When the threshold value is reached, the switch unit is controlled to be turned on; when it rises to be greater than the first threshold value, the switch unit will be controlled to be turned off, and the DCDC conversion circuit enters the MPPT operation.
  • each input voltage When the light gradually weakens every evening, each input voltage will gradually drop from the normal value. When it drops below the first threshold, the switching unit is not controlled to be turned on, but when it continues to drop below the second threshold, the switch unit is turned on.
  • the switching unit is controlled to be turned on, the DCDC conversion circuit is bypassed, and the reduction of conversion efficiency is avoided.
  • the switching unit does not operate frequently, but maintains the previous state, avoiding damage to the life of the devices in the switching unit.
  • FIG. 5 Another embodiment of the present application also provides a power conversion system, as shown in FIG. 5 , FIG. 6 or FIG. 7 , including: at least two input power sources (input power source 1 and input power source 2 as shown in the figure), And, the power conversion device as described in any one of the above embodiments.
  • the structural arrangement and working principle of the power conversion device can be referred to the above-mentioned embodiments, and will not be repeated here.
  • the control unit of the power conversion device may execute the control methods described in the above embodiments, which will not be repeated here.
  • the power conversion device may be: a DC combiner box without a DCAC conversion circuit, or a string inverter with a DCAC conversion circuit.
  • the input power source can be: a photovoltaic module, a photovoltaic string or an energy storage battery. No specific limitation is made here, it depends on the application environment, and all are within the protection scope of the present application.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

La présente demande concerne un système de conversion de puissance, un appareil de conversion de puissance et un procédé de commande associé. Dans l'appareil de conversion de puissance, des bornes d'entrée de chaque circuit de conversion CC/CC à l'intérieur de l'appareil de conversion de puissance sont respectivement connectées à des alimentations d'entrée correspondantes, et les bornes de sortie sont connectées en parallèle. Au moins un circuit de conversion CC/CC a une structure d'électrode positive commune pour l'entrée et la sortie. En outre, au moins un autre circuit de conversion CC/CC a une structure d'électrode négative commune pour l'entrée et la sortie. De plus, au moins une électrode négative de borne d'entrée du circuit de conversion CC/CC qui a une structure d'électrode positive commune pour l'entrée et la sortie est connectée, au moyen d'une unité de commutation correspondante, à au moins une électrode positive de borne d'entrée du circuit de conversion CC/CC qui a une structure d'électrode négative commune pour l'entrée et la sortie. Par conséquent, lorsque la tension de l'alimentation électrique d'entrée est faible, l'unité de commutation peut être conduite, de telle sorte que des alimentations électriques d'entrée sur deux côtés de l'unité de commutation sont connectées en série. De plus, en raison de la configuration structurelle des circuits de conversion CC/CC au niveau de deux côtés de l'unité de commutation, les deux sont contournés, ce qui permet d'augmenter l'efficacité de conversion de l'appareil et de réduire la chaleur générée par le circuit.
PCT/CN2021/138257 2021-05-18 2021-12-15 Système de conversion de puissance, appareil de conversion de puissance et procédé de commande associé WO2022242135A1 (fr)

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CN103269157A (zh) * 2013-05-09 2013-08-28 燕山大学 双向双输入sepic直流变换器及其功率分配方法
CN104104248A (zh) * 2014-06-20 2014-10-15 郑州大学 双电源光伏逆变器及其控制方法
CN104953945A (zh) * 2015-07-01 2015-09-30 中民新能投资有限公司 高效率的光伏发电系统以及发电方法
WO2020133351A1 (fr) * 2018-12-29 2020-07-02 华为技术有限公司 Onduleur
CN113258773A (zh) * 2021-05-18 2021-08-13 阳光电源股份有限公司 一种电力变换系统和电力变换装置及其控制方法

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CN115864814A (zh) * 2023-02-27 2023-03-28 阳光电源股份有限公司 一种软启动电路和功率变换设备
CN115864814B (zh) * 2023-02-27 2023-05-30 阳光电源股份有限公司 一种软启动电路和功率变换设备

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