CN104375039B - Testing system for isolation type direct-current transformer - Google Patents
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Abstract
一种隔离型直流变压器测试系统，它包括直流主电源和能量回馈控制直流电源，所述直流主电源的交流输入端接三相电源，其直流输出端接被测试隔离型直流变压器的输入端，所述能量回馈控制直流电源的交流输入端接三相电源，其直流输出侧的正极与直流主电源的正极连接，负极与被测试隔离型直流变压器输出侧的正极连接，被测试隔离型直流变压器的输入侧的负极与输出侧的负极短接。本发明在隔离型直流变压器测试实验系统中配置了能量回馈控制直流电源，通过控制其输出电压不仅可以调节测试功率，而且还能够实现能量回馈。该系统降低了对测试主电源容量的要求，也不需要配置大容量负载，从而最大程度地减少了测试平台的投资以及测试过程中的能量消耗。
An isolated DC transformer testing system, which includes a DC main power supply and an energy feedback control DC power supply, the AC input terminal of the DC main power supply is connected to a three-phase power supply, and its DC output terminal is connected to the input terminal of the isolated DC transformer to be tested, The AC input terminal of the energy feedback control DC power supply is connected to a three-phase power supply, the positive pole of the DC output side is connected to the positive pole of the DC main power supply, the negative pole is connected to the positive pole of the output side of the isolated DC transformer under test, and the isolated DC transformer under test The negative pole on the input side is shorted to the negative pole on the output side. The present invention configures an energy feedback control DC power supply in the isolated DC transformer test experiment system, and not only can adjust the test power by controlling its output voltage, but also can realize energy feedback. The system reduces the requirement for the test main power supply capacity and does not need to configure large-capacity loads, thereby minimizing the investment in the test platform and energy consumption during the test.
Description
技术领域technical field
本发明涉及一种用于测试隔离型直流变压器(DC-DC变换器)的实验系统，属于变压器技术领域。The invention relates to an experimental system for testing an isolated DC transformer (DC-DC converter), belonging to the technical field of transformers.
背景技术Background technique
随着大功率电力电子开关器件和新型铁磁材料等技术的进步，基于中高频变压器和大功率交直流变换器的电力电子变压器日益受到人们的重视。电力电子变压器，也称为固态变压器，相对于传统的工频电力变压器而言，由于采用了高频化技术，变压器的重量和体积都大为减小，加之新型铁磁材料(如非晶合金和纳米晶)的应用，变压器的损耗也进一步降低。With the advancement of high-power power electronic switching devices and new ferromagnetic materials, power electronic transformers based on medium-high frequency transformers and high-power AC-DC converters have attracted increasing attention. Power electronic transformers, also known as solid-state transformers, compared with traditional industrial frequency power transformers, due to the use of high-frequency technology, the weight and volume of transformers are greatly reduced, and new ferromagnetic materials (such as amorphous alloys and nanocrystals), the loss of the transformer is further reduced.
作为大功率电力电子变压器的核心组成部件，隔离型直流变压器(DC-DC变换器)的额定电压和额定电流都有较大提升，从而对测试平台提出了更高的要求。隔离型直流变压器最基本的功能就是能量传递，因此，其基本测试项目包括功率测试和控制功能测试。采用传统测试方法对隔离型直流变压器进行全功率测试时，一方面需要大容量电源提供功率输出，另一方面还需要负载消耗相应的功率，实现能量传递。这样的大功率测试平台不仅成本较高，而且电能浪费严重，因此有必要加以改进。As the core component of high-power power electronic transformers, the rated voltage and rated current of isolated DC transformers (DC-DC converters) have been greatly improved, which puts forward higher requirements for the test platform. The most basic function of an isolated DC transformer is energy transfer, so its basic test items include power test and control function test. When using the traditional test method to test the full power of the isolated DC transformer, on the one hand, a large-capacity power supply is required to provide power output, and on the other hand, the load must consume corresponding power to realize energy transfer. Such a high-power test platform not only has high cost, but also has serious waste of electric energy, so it is necessary to improve it.
发明内容Contents of the invention
本发明的目的在于针对现有技术之弊端，提供一种隔离型直流变压器测试系统，以降低测试平台的建设成本，减少电能的浪费。The object of the present invention is to provide an isolated DC transformer test system to reduce the construction cost of the test platform and reduce the waste of electric energy against the drawbacks of the prior art.
本发明所述问题是以下述技术方案实现的：Problem described in the present invention is realized with following technical scheme:
一种隔离型直流变压器测试系统，构成中包括直流主电源和能量回馈控制直流电源，所述直流主电源的交流输入端接三相电源，其直流输出端接被测试隔离型直流变压器的输入端，所述能量回馈控制直流电源的交流输入端接三相电源，其直流输出侧的正极与直流主电源的正极连接，负极与被测试隔离型直流变压器输出侧的正极连接，被测试隔离型直流变压器的输入侧的负极与输出侧的负极短接。An isolated DC transformer testing system, comprising a DC main power supply and an energy feedback control DC power supply, the AC input terminal of the DC main power supply is connected to a three-phase power supply, and its DC output terminal is connected to the input terminal of the isolated DC transformer to be tested , the AC input terminal of the energy feedback control DC power supply is connected to the three-phase power supply, the positive pole of the DC output side is connected to the positive pole of the DC main power supply, the negative pole is connected to the positive pole of the output side of the isolated DC transformer under test, and the isolated DC power supply under test is The negative pole on the input side of the transformer is shorted to the negative pole on the output side.
上述隔离型直流变压器测试系统，所述直流主电源包括三绕组移相变压器、第一平波电抗器、两个三相晶闸管全控整流桥和两个滤波电容，三绕组移相变压器的输入绕组接三相电源，两个三相晶闸管全控整流桥串联连接后经第一平波电抗器接于被测试隔离型直流变压器的输入端，它们的输入端分别接三绕组移相变压器的不同输出绕组，两个滤波电容串联连接后接于被测试隔离型直流变压器的输入端，二者的串接点接地。In the above-mentioned isolated DC transformer test system, the DC main power supply includes a three-winding phase-shifting transformer, a first smoothing reactor, two three-phase thyristor fully-controlled rectifier bridges and two filter capacitors, and the input winding of the three-winding phase-shifting transformer Connected to the three-phase power supply, two three-phase thyristor full-controlled rectifier bridges are connected in series and then connected to the input end of the isolated DC transformer to be tested through the first smoothing reactor, and their input ends are respectively connected to different outputs of the three-winding phase-shifting transformer The winding, two filter capacitors are connected in series and then connected to the input end of the isolated DC transformer to be tested, and the series connection point of the two is grounded.
上述隔离型直流变压器测试系统，构成中还包括第二平波电抗器，所述第二平波电抗器连接在直流主电源与能量回馈控制直流电源的输出侧的正极之间。The above-mentioned isolated DC transformer test system further includes a second smoothing reactor, and the second smoothing reactor is connected between the main DC power supply and the positive pole of the output side of the energy feedback control DC power supply.
上述隔离型直流变压器测试系统，所述能量回馈控制直流电源包括三相变压器、不控整流器和直流调压电路，所述三相变压器的输入端接三相电源，输出端经不控整流器给直流调压电路供电，所述直流调压电路的输出侧的正极与直流主电源的正极连接，负极与被测试隔离型直流变压器输出侧的正极连接，被测试隔离型直流变压器的测试功率通过PI控制器进行闭环无差控制，所述PI控制器的输入信号为测试对象实际输出的功率与功率给定之间的误差信号，输出为直流调压电路的控制输入信号。In the above-mentioned isolated DC transformer test system, the energy feedback control DC power supply includes a three-phase transformer, an uncontrolled rectifier and a DC voltage regulating circuit, the input terminal of the three-phase transformer is connected to the three-phase power supply, and the output terminal is connected to the DC power supply through the uncontrolled rectifier. The voltage regulating circuit supplies power, the positive pole of the output side of the DC voltage regulating circuit is connected to the positive pole of the DC main power supply, the negative pole is connected to the positive pole of the output side of the isolated DC transformer to be tested, and the test power of the isolated DC transformer to be tested is controlled by PI The PI controller performs closed-loop error-free control, the input signal of the PI controller is the error signal between the actual output power of the test object and the power reference, and the output is the control input signal of the DC voltage regulating circuit.
上述隔离型直流变压器测试系统，所述直流调压电路为降压斩波电路，所述降压斩波电路包括降压斩波开关S0、降压斩波二极管D1和降压斩波电抗器L3，不控整流器输出侧的正极依次经降压斩波开关S0和降压斩波电抗器L3接直流主电源的正极，所述降压斩波二极管D1的正极接不控整流器输出侧的负极和被测试隔离型直流变压器输出侧的正极，其负极接降压斩波开关S0和降压斩波电抗器L3的串接点。In the above isolated DC transformer test system, the DC voltage regulating circuit is a step-down chopper circuit, and the step-down chopper circuit includes a step-down chopper switch S0, a step-down chopper diode D1 and a step-down chopper reactor L3 , the positive pole of the output side of the uncontrolled rectifier is connected to the positive pole of the DC main power supply through the step-down chopper switch S0 and the step-down chopper reactor L3 in turn, and the positive pole of the step-down chopper diode D1 is connected to the negative pole of the output side of the uncontrolled rectifier and The positive pole of the output side of the isolated DC transformer under test is connected to the negative pole of the step-down chopper switch S0 and the series connection point of the step-down chopper reactor L3.
上述隔离型直流变压器测试系统，所述直流调压电路为隔离型DC/DC变换电路，所述隔离型DC/DC变换电路包括第三滤波电容C3、第四滤波电容C4、第三平波电抗器L4、高频隔离变压器Tx、四个电子开关和两个整流二极管，第三滤波电容C3接在不控整流器的输出端，四个电子开关接成单相全桥逆变电路，该单相全桥逆变电路的直流输入端接不控整流器的输出电压，交流输出端接高频隔离变压器Tx的输入端，高频隔离变压器Tx输出的交流电压先由两个整流二极管进行全波整流，再经第三平波电抗器L4和第四滤波电容C4滤波后得到的直流电压作为直流调压电路的输出电压。In the above isolated DC transformer test system, the DC voltage regulating circuit is an isolated DC/DC conversion circuit, and the isolated DC/DC conversion circuit includes a third filter capacitor C3, a fourth filter capacitor C4, a third smoothing reactance device L4, high-frequency isolation transformer Tx, four electronic switches and two rectifier diodes, the third filter capacitor C3 is connected to the output end of the uncontrolled rectifier, and the four electronic switches are connected to form a single-phase full-bridge inverter circuit. The DC input terminal of the full-bridge inverter circuit is connected to the output voltage of the uncontrolled rectifier, and the AC output terminal is connected to the input terminal of the high-frequency isolation transformer Tx. The AC voltage output by the high-frequency isolation transformer Tx is firstly rectified by two rectifier diodes. The DC voltage obtained after being filtered by the third smoothing reactor L4 and the fourth filter capacitor C4 is used as the output voltage of the DC voltage regulating circuit.
本发明在隔离型直流变压器测试实验系统中配置了能量回馈控制直流电源，通过控制其输出电压不仅可以调节测试功率，而且还能够实现能量回馈。该系统降低了对测试主电源容量的要求，也不需要配置大容量负载，从而最大程度地减少了测试平台的投资以及测试过程中的能量消耗。In the present invention, an energy feedback control DC power supply is configured in the isolated DC transformer test experiment system. By controlling its output voltage, not only the test power can be adjusted, but also the energy feedback can be realized. The system reduces the requirement on the capacity of the test main power supply and does not need to configure a large-capacity load, thereby minimizing the investment in the test platform and the energy consumption during the test.
附图说明Description of drawings
下面结合附图对本发明作进一步详述。The present invention will be described in further detail below in conjunction with the accompanying drawings.
图1为本发明的电原理图；Fig. 1 is the electrical schematic diagram of the present invention;
图2为直流调压电路原理图；Figure 2 is a schematic diagram of a DC voltage regulating circuit;
图3为能量回馈控制框图。Figure 3 is a block diagram of energy feedback control.
图1中各标号清单为：DC/DC、直流变压器，T1、三绕组移相变压器，T2、三相变压器，Z、不控整流器，G、直流调压电路，Q1、第一全控整流桥，Q2、第二全控整流桥，L1、第一平波电抗器，L2、第二平波电抗器，C1、第一滤波电容，C2、第二滤波电容。The list of labels in Figure 1 is: DC/DC, DC transformer, T1, three-winding phase-shifting transformer, T2, three-phase transformer, Z, uncontrolled rectifier, G, DC voltage regulating circuit, Q1, the first full-controlled rectifier bridge , Q2, the second fully-controlled rectifier bridge, L1, the first smoothing reactor, L2, the second smoothing reactor, C1, the first filter capacitor, C2, the second filter capacitor.
图2中各标号清单为：S0、降压斩波开关，D1、降压斩波二极管，L3、降压斩波电抗器，C3、第三滤波电容，C4、第四滤波电容，S1～S4、第一电子开关～第四电子开关，Tx、高频隔离变压器，D21、第一整流二极管，D22、第二整流二极管，L4、第三平波电抗器。The list of labels in Figure 2 is: S0, step-down chopper switch, D1, step-down chopper diode, L3, step-down chopper reactor, C3, third filter capacitor, C4, fourth filter capacitor, S1～S4 , the first electronic switch to the fourth electronic switch, Tx, the high frequency isolation transformer, D21, the first rectifying diode, D22, the second rectifying diode, L4, the third smoothing reactor.
具体实施方式detailed description
本发明提出了用于隔离型直流变压器测试的实验系统及能量回馈控制方法。所提出实验系统如图1所示，实验平台主要包括以下三个部分：The invention provides an experimental system and an energy feedback control method for testing an isolated DC transformer. The proposed experimental system is shown in Figure 1. The experimental platform mainly includes the following three parts:
1)直流主电源：为测试提供直流电压Uin，基于安全考虑，可采用正负直流母线设计。直流主电源采用经典的基于晶闸管的12脉动整流电路，直流侧分压电容中点接地，以降低装置对绝缘要求的限制。1) DC main power supply: DC voltage Uin is provided for the test. Based on safety considerations, the design of positive and negative DC busbars can be adopted. The DC main power supply adopts a classic thyristor-based 12-pulse rectification circuit, and the midpoint of the DC side voltage dividing capacitor is grounded to reduce the limitation of the device on insulation requirements.
2)能量回馈控制直流电源：提供串入测试回路的可调直流电压Uc。当需要提供能量回馈时，通过改变串入的直流电压大小调节回路的电流，从而改变电力电子变压器传递的功率。2) Energy feedback control DC power supply: provide adjustable DC voltage Uc connected in series to the test circuit. When it is necessary to provide energy feedback, the current of the loop is adjusted by changing the DC voltage connected in series, thereby changing the power delivered by the power electronic transformer.
3)测试对象：直流变压器，实现功率传递和电压变换，输入直流电压为Uin，输出直流电压为Uout。图1中给出了该类变换器的一个拓扑示例，本发明针对的测试对象不限于示例拓扑。3) Test object: DC transformer, which realizes power transfer and voltage conversion, the input DC voltage is Uin, and the output DC voltage is Uout. A topology example of this type of converter is given in FIG. 1 , and the test object targeted by the present invention is not limited to the example topology.
当测试对象能够通过自身的控制实现功率控制和电压大小调节的时候，能量回馈控制直流电源的输出电压Uc为零，即不需附加的能量回馈控制。当测试对象不能主动控制传输功率大小的时候，需要能量回馈控制直流电源调节输出直流电压Uc，实现对测试对象传输功率大小的控制。When the test object can realize power control and voltage adjustment through its own control, the output voltage Uc of the energy feedback control DC power supply is zero, that is, no additional energy feedback control is required. When the test object cannot actively control the transmission power, the energy feedback control DC power supply is required to adjust the output DC voltage Uc to realize the control of the transmission power of the test object.
图2为所述能量回馈控制直流电源中直流调压电路的两种实现形式，其中，(a)为降压斩波电路，(b)为隔离型DC/DC调压电路。两种电路均可通过电力电子开关器件(如IGBT)进行控制，达到调节输出直流电压的目的，其控制方法由图3给出。Fig. 2 shows two implementation forms of the DC voltage regulation circuit in the energy feedback control DC power supply, wherein (a) is a step-down chopper circuit, and (b) is an isolated DC/DC voltage regulation circuit. Both circuits can be controlled by power electronic switching devices (such as IGBT) to achieve the purpose of adjusting the output DC voltage. The control method is given in Figure 3.
图3为能量回馈控制框图，给出了能量回馈控制的具体实现方法。图3中，Pref为测试对象需要输出的功率(功率给定)，Pout为测试对象实际输出的功率(功率反馈)，其值为测试对象输出的直流电压Uout与能量回馈回路流通的电流Ic的乘积。能量回馈控制采用一个PI控制器调节功率给定Pref与功率反馈Pout之间的误差，实现功率的无差调节。PI控制器的输出d为降压斩波电路的占空比或隔离型DC/DC调压电路的移相控制角，通过d的改变调节控制电压Uc，最终实现能量回馈环路功率大小的调节。具体原理为：Fig. 3 is a block diagram of energy feedback control, which provides a specific implementation method of energy feedback control. In Fig. 3, Pref is the power that the test object needs to output (power given), Pout is the actual output power of the test object (power feedback), and its value is the DC voltage Uout output by the test object and the current Ic flowing in the energy feedback loop product. The energy feedback control adopts a PI controller to adjust the error between the power reference Pref and the power feedback Pout, so as to realize the no-difference adjustment of the power. The output d of the PI controller is the duty ratio of the step-down chopper circuit or the phase-shift control angle of the isolated DC/DC voltage regulator circuit. The control voltage Uc is adjusted by changing d, and finally the power of the energy feedback loop is adjusted. . The specific principle is:
由图1电路所示的电压关系，有From the voltage relationship shown in the circuit of Figure 1, there are
Uout＝Uin-Uc，Uout=Uin-Uc,
而由测试对象的工作特性，可得And from the working characteristics of the test object, we can get
其中，Zeq为测试对象的等值阻抗。由上述两式不难看出，调节电压Uc，测试对象的输出直流电压Uout将随之发生变化，进而使得反馈回路的电流Ic改变，最终使得实际的功率反馈值Pout达到功率给定值，实现功率的无差调节。Among them, Zeq is the equivalent impedance of the test object. It is not difficult to see from the above two formulas that by adjusting the voltage Uc, the output DC voltage Uout of the test object will change accordingly, and then the current Ic of the feedback loop will change, and finally the actual power feedback value Pout will reach the power given value, and the power will be realized. no-difference adjustment.
当所述直流调压电路采用图2(a)所示的降压斩波电路时，d为主开关S0的占空比，根据降压斩波电路的工作原理，直流输出电压Uc为d与直流调压电路输入电压的乘积，当该输入电压不变而调节d时，即可改变直流调压电路的输出电压Uc。When the DC regulator circuit adopts the step-down chopper circuit shown in Fig. 2 (a), d is the duty cycle of the main switch S0, and according to the working principle of the step-down chopper circuit, the DC output voltage Uc is d and The product of the input voltage of the DC voltage regulating circuit, when the input voltage remains unchanged and d is adjusted, the output voltage Uc of the DC voltage regulating circuit can be changed.
当所述直流调压电路采用图2(b)所示的隔离型DC/DC调压电路时，d为S1～S4构成的单相全桥逆变电路的移相控制角(0°＜d＜180°)，根据该电路的工作原理，直流输出电压Uc与d/180°、直流调压电路输入电压和Tx变比成正比，当该输入电压和Tx变比不变而调节d时，即可改变直流调压电路的输出电压Uc。When the DC voltage regulation circuit adopts the isolated DC/DC voltage regulation circuit shown in Figure 2 (b), d is the phase-shift control angle of the single-phase full-bridge inverter circuit composed of S1～S4 (0°<d <180°), according to the working principle of the circuit, the DC output voltage Uc is proportional to d/180°, the input voltage of the DC voltage regulator circuit and the Tx ratio, when the input voltage and the Tx ratio remain unchanged and d is adjusted, The output voltage Uc of the DC voltage regulating circuit can be changed.
本发明具有以下特点和功能：The present invention has following characteristics and functions:
1)实验系统可用于隔离型直流变压器测试，具有能量回馈功能。1) The experimental system can be used for testing isolated DC transformers and has the function of energy feedback.
2)实验系统由直流主电源、能量回馈控制直流电源和测试对象三部分构成。2) The experimental system consists of three parts: DC main power supply, energy feedback control DC power supply and test object.
3)通过能量回馈控制直流电源输出电压的控制改变能量回馈环路的功率大小。3) Change the power of the energy feedback loop by controlling the output voltage of the DC power supply through energy feedback control.
4)能量回馈控制采用PI控制实现功率闭环控制，使装置在实现能量回馈的同时，实现了功率可控可调，满足测试需求。4) Energy feedback control adopts PI control to realize power closed-loop control, so that the device realizes energy feedback and at the same time realizes controllable and adjustable power to meet the test requirements.
本发明的实施步骤：Implementation steps of the present invention:
1)建立如图1所示的实验系统，提供一定电压的直流母线，便于直流变压器接入。直流母线的电压等级根据测试对象的要求，由基于十二脉动整流的直流主电源进行闭环调节。具体地，直流主电源由三绕组移相变压器T1、两个三相晶闸管全控整流桥、两个滤波电容和第一平波电抗器L1构成。采用直流电压反馈技术，控制晶闸管的触发角，可以实现直流母线电压的准确控制。1) Establish the experimental system shown in Figure 1, provide a DC bus with a certain voltage, and facilitate the connection of DC transformers. The voltage level of the DC bus is adjusted in a closed loop by the DC main power supply based on twelve-pulse rectification according to the requirements of the test object. Specifically, the DC main power supply is composed of a three-winding phase-shifting transformer T1, two three-phase thyristor fully-controlled rectifier bridges, two filter capacitors and a first smoothing reactor L1. Using DC voltage feedback technology to control the firing angle of the thyristor can realize accurate control of the DC bus voltage.
2)将能量回馈控制直流电源的直流输出端串联至直流变压器的能量回馈回路。具体地，能量回馈控制直流电源由三相变压器T2提供合适的交流电压，由三相不控整流器Z提供第一级直流电压，而由带电流(功率)反馈的直流调压电路输出第二级可调直流电压。为了改善能量回馈回路的电流波形，回路中还串联了第二平波电抗器L2。2) Connecting the DC output end of the energy feedback control DC power supply in series to the energy feedback loop of the DC transformer. Specifically, the energy feedback control DC power supply is provided with a suitable AC voltage by the three-phase transformer T2, the first-level DC voltage is provided by the three-phase uncontrolled rectifier Z, and the second-level DC voltage is output by a DC voltage regulator circuit with current (power) feedback Adjustable DC voltage. In order to improve the current waveform of the energy feedback loop, a second smoothing reactor L2 is also connected in series in the loop.
3)能量回馈回路功率大小的调节。采用一个PI控制器调节功率给定与功率反馈之间的误差，实现无差调节，如图3所示，PI控制器的输出d为直流调压电路的占空比或移相控制角，通过d的改变调节控制电压Uc，最终实现能量回馈回路功率大小的调节。3) Adjustment of the power of the energy feedback loop. A PI controller is used to adjust the error between power reference and power feedback to realize no-difference regulation. As shown in Figure 3, the output d of the PI controller is the duty ratio or phase-shift control angle of the DC voltage regulator circuit. The change of d adjusts the control voltage Uc, and finally realizes the adjustment of the power of the energy feedback loop.
本发明能够实现直流变压器的功率测试，尤其适用于无主动功率控制能力的直流变压器。The invention can realize the power test of the DC transformer, and is especially suitable for the DC transformer without active power control capability.
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| CN106645916A (en) * | 2015-10-29 | 2017-05-10 | 国网智能电网研究院 | Power test system of high-voltage DC-DC converter |
| CN105717388A (en) * | 2015-12-08 | 2016-06-29 | 国家电网公司 | Transformer test platform |
| CN106291012A (en) * | 2016-08-26 | 2017-01-04 | 深圳市伊力科电源有限公司 | Programmable DC power supply realizes system and method |
| CN109725267B (en) * | 2017-10-31 | 2024-09-10 | 南方电网科学研究院有限责任公司 | Test circuit and test method for solid-state transformer |
| CN108599592B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Modularized isolation type high-capacity high-gain rectifier |
| CN108879623B (en) * | 2018-06-13 | 2020-06-05 | 南京南瑞继保电气有限公司 | Multi-voltage-level direct current network system and control protection method |
| CN108809138B (en) * | 2018-06-29 | 2025-01-14 | 西安领充无限新能源科技有限公司 | A bidirectional ACDC circuit compatible with three-phase and single-phase AC power supplies and a control method thereof |
| CN111404370A (en) * | 2020-03-05 | 2020-07-10 | 北京动力源新能源科技有限责任公司 | A kind of DC-DC power module testing equipment and using method |
| CN113567877A (en) * | 2021-06-09 | 2021-10-29 | 国电南瑞科技股份有限公司 | ISOP type direct current transformer power module test circuit and test method |
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