Multi-working-condition low-loss acceleration power cycle test device and control method

Abstract

The invention discloses a multi-working-condition low-loss acceleration power cycle testing device and a control method, and belongs to the technical field of power equipment testing. According to the invention, the inductance data of the inductance module, the power device voltage data output by the to-be-tested power device module and the load voltage data output by the load converter module are interacted, and different power device working conditions are combined; on-off control signals of the to-be-tested power device module and on-off control signals of the load converter module can be dynamically generated, so that acceleration power cycle testing under multiple working conditions is realized; through the connection of the load converter module, the to-be-tested power device module and the interactive inductor module, the energy in the acceleration power cycle test process is cyclically exchanged between the load converter module and the to-be-tested power device module, so that the energy loss of the acceleration power cycle test is reduced.

Description

Technical Field

[0001] This invention belongs to the field of power equipment testing technology, and in particular relates to an accelerated power cycle testing device and control method with low loss under multiple operating conditions. Background Technology

[0002] Power devices are core actuators in power systems and are widely used in power conversion and control fields, such as frequency converters, inverters, and rectifiers. Their reliability directly determines the stability and lifespan of the entire power system. Accelerated power cycling testing, as a reliability verification method for power devices, actively and rapidly cycles the switching on and off of the power devices, causing drastic fluctuations in their junction temperature. This simulates the aging process that occurs over many years of actual operation in a short period of time and predicts the lifespan of the power devices, thereby ensuring the stable operation of power devices in the power system.

[0003] Currently, accelerated power cycle testing of power devices typically involves applying a stable DC source and load pulses to the device, causing its temperature to rise due to conduction losses, thus achieving accelerated power cycle testing. However, this method only provides a single operating condition, which differs significantly from the actual operating conditions of the power device, resulting in low accuracy of accelerated power cycle testing and reduced accuracy and applicability of lifetime prediction. Furthermore, existing testing processes usually perform accelerated power cycle testing at the product level, leading to significant energy waste and high losses during testing, increasing testing costs and limiting efficiency. Therefore, there is an urgent need for a multi-condition, low-loss accelerated power cycle testing device and control method to overcome the shortcomings of existing technologies. Summary of the Invention

[0004] The present invention aims to provide a multi-condition, low-loss accelerated power cycle testing device and control method to solve the above-mentioned technical problems, improve the accuracy of accelerated power cycle testing of power devices, and reduce the energy loss of accelerated power cycle testing.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a multi-condition, low-loss accelerated power cycle testing device, comprising: a power supply module, a power device under test module, a load converter module, an interactive inductor module, and a controller module.

[0006] The output terminal of the power device under test module is electrically connected to the first terminal of the interactive inductor module.

[0007] The output terminal of the load converter module is electrically connected to the second terminal of the interactive inductor module.

[0008] The data acquisition terminal of the controller module is electrically connected to the output terminal of the power device under test module and the output terminal of the load converter module, respectively.

[0009] The control signal output terminal of the controller module is electrically connected to the control terminal of the power device under test module and the control terminal of the load converter module, respectively.

[0010] The power module is used to provide voltage to the power device under test module and the load converter module;

[0011] The controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module; based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, it generates the on / off control signal of the power device module under test and the on / off control signal of the load converter module.

[0012] It is understood that this invention constructs a multi-condition, low-loss accelerated power cycle testing device by using a power supply module, a power device under test (DUT) module, a load converter module, an interactive inductor module, and a controller module. By using the inductance data from the interactive inductor module, the power device voltage data output by the DUT module, and the load voltage data output by the load converter module, combined with different power device operating conditions, it can dynamically generate on / off control signals for the DUT module and the load converter module, thereby achieving multi-condition accelerated power cycle testing. Through the connection of the load converter module, the DUT module, and the interactive inductor module, energy is cyclically exchanged between the load converter module and the DUT module during the accelerated power cycle testing process, thereby reducing energy loss during the accelerated power cycle testing.

[0013] As a preferred embodiment, the power device under test module includes: a first power device under test, a second power device under test, a third power device under test, a fourth power device under test, a fifth power device under test, and a sixth power device under test;

[0014] The collector of the first power device under test is electrically connected to the positive output terminal of the power module;

[0015] The collector of the third power device under test is electrically connected to the positive output terminal of the power supply module.

[0016] The collector of the fifth power device under test is electrically connected to the positive output terminal of the power supply module.

[0017] The emitter of the second power device under test is electrically connected to the negative output terminal of the power module;

[0018] The emitter of the fourth power device under test is electrically connected to the negative output terminal of the power module.

[0019] The emitter of the sixth power device under test is electrically connected to the negative output terminal of the power module.

[0020] The emitter of the first power device under test is electrically connected to the collector of the second power device under test;

[0021] The emitter of the third power device under test is electrically connected to the collector of the fourth power device under test.

[0022] The emitter of the fifth power device under test is electrically connected to the collector of the sixth power device under test;

[0023] The emitter of the first power device under test serves as the output terminal of the power device under test module and is electrically connected to the first terminal of the interactive inductor module.

[0024] The emitter of the first power device under test is also electrically connected to the data acquisition terminal of the controller module;

[0025] The emitter of the third power device under test serves as the output terminal of the power device under test module and is electrically connected to the first terminal of the interactive inductor module.

[0026] The emitter of the third power device under test is also electrically connected to the data acquisition terminal of the controller module;

[0027] The emitter of the fifth power device under test serves as the output terminal of the power device under test module and is electrically connected to the first terminal of the interactive inductor module.

[0028] The emitter of the fifth power device under test is also electrically connected to the data acquisition terminal of the controller module;

[0029] The bases of the first power device under test, the second power device under test, the third power device under test, the fourth power device under test, the fifth power device under test, and the sixth power device under test all serve as the control terminals of the power device under test module, and are all electrically connected to the control signal output terminal of the controller module.

[0030] This preferred solution combines multiple power devices under test (DUTs) to form a three-phase full-bridge topology. This not only avoids overload of a single DUT and adapts to testing requirements under different operating conditions, but also allows for dynamic adjustment of the on / off state of each phase through the controller module, improving the flexibility of accelerated power cycle testing. Furthermore, the cooperation between the DUT module and the load converter module forms an efficient energy return path, enabling energy to circulate and exchange between the load converter module and the DUT module during accelerated power cycle testing, thereby reducing energy loss during the test.

[0031] As a preferred embodiment, the load converter module includes: a first load power device, a second load power device, a third load power device, a fourth load power device, a fifth load power device, and a sixth load power device.

[0032] The collector of the first load power device is electrically connected to the positive output terminal of the power module;

[0033] The collector of the third load power device is electrically connected to the positive output terminal of the power module.

[0034] The collector of the fifth load power device is electrically connected to the positive output terminal of the power supply module.

[0035] The emitter of the second load power device is electrically connected to the negative output terminal of the power module;

[0036] The emitter of the fourth load power device is electrically connected to the negative output terminal of the power module.

[0037] The emitter of the sixth load power device is electrically connected to the negative output terminal of the power module.

[0038] The emitter of the first load power device is electrically connected to the collector of the second load power device;

[0039] The emitter of the third load power device is electrically connected to the collector of the fourth load power device.

[0040] The emitter of the fifth load power device is electrically connected to the collector of the sixth load power device;

[0041] The emitter of the first load power device serves as the output terminal of the load converter module and is electrically connected to the second terminal of the interactive inductor module.

[0042] The emitter of the first load power device is also electrically connected to the data acquisition terminal of the controller module;

[0043] The emitter of the third load power device serves as the output terminal of the load converter module and is electrically connected to the second terminal of the interactive inductor module.

[0044] The emitter of the third load power device is also electrically connected to the data acquisition terminal of the controller module;

[0045] The emitter of the fifth load power device serves as the output terminal of the load converter module and is electrically connected to the second terminal of the interactive inductor module.

[0046] The emitter of the fifth load power device is also electrically connected to the data acquisition terminal of the controller module;

[0047] The bases of the first load power device, the second load power device, the third load power device, the fourth load power device, the fifth load power device, and the sixth load power device all serve as the control terminals of the load converter module, and are all electrically connected to the control signal output terminal of the controller module.

[0048] This preferred solution combines multiple load power devices to form a three-phase full-bridge topology, which is the same as the topology of the power device under test module. This creates a symmetrical and efficient energy circulation system, which, combined with the control of the controller module, enables accelerated power cycle testing under different operating conditions. Furthermore, by forming an efficient energy return path, energy is circulated and exchanged between the load converter module and the power device under test module during the accelerated power cycle test, thereby reducing energy loss during the accelerated power cycle test.

[0049] As a preferred embodiment, the interactive inductor module includes: a first inductor, a second inductor, and a third inductor;

[0050] The first end of the first inductor serves as the first end of the interactive inductor module, and is electrically connected to the emitter of the first power device under test.

[0051] The first end of the second inductor serves as the first end of the interactive inductor module, and it is electrically connected to the emitter of the third power device under test.

[0052] The first end of the third inductor serves as the first end of the interactive inductor module, and it is electrically connected to the emitter of the fifth power device under test.

[0053] The second end of the first inductor serves as the second end of the interactive inductor module, and is electrically connected to the emitter of the first load power device.

[0054] The second end of the second inductor serves as the second end of the interactive inductor module, and is electrically connected to the emitter of the third load power device;

[0055] The second end of the third inductor serves as the second end of the interactive inductor module, and is electrically connected to the emitter of the fifth load power device.

[0056] This preferred solution uses a first inductor, a second inductor, and a third inductor to form an inductor module. Through its connection with the power device under test (DUT) module and the load converter module, it ensures the independence and flexibility of phase control. This allows the controller module to independently control the accelerated power cycle test of each phase, thereby ensuring accurate simulation of complex operating conditions such as three-phase imbalance and improving the accuracy of accelerated power cycle testing of power devices. The inductor module enables energy exchange between the DUT module and the load converter module, requiring only a small inductance value. This small inductance value reduces additional energy loss, further lowering the energy loss during accelerated power cycle testing.

[0057] As a preferred embodiment, the power module includes: a DC power supply, a capacitor, and a fuse;

[0058] Both the positive and negative output terminals of the DC power supply serve as the output terminals of the power module.

[0059] Both the positive and negative output terminals of the DC power supply are electrically connected to the input terminal of the power device module under test.

[0060] The positive and negative output terminals of the DC power supply are both electrically connected to the input terminal of the load converter module.

[0061] The first terminal of the capacitor is electrically connected to the positive output terminal of the DC power supply.

[0062] The second terminal of the capacitor is electrically connected to the negative output terminal of the DC power supply.

[0063] The first end of the fuse is electrically connected to the positive output terminal of the DC power supply;

[0064] The second end of the fuse is electrically connected to the input end of the power device module under test;

[0065] The second end of the fuse is electrically connected to the input end of the load converter module.

[0066] This preferred solution, through the combination of capacitors and fuses, ensures the stability and safety of multi-condition testing, thereby enabling the accelerated power cycle testing device to operate for a long time in a low-loss mode.

[0067] As a preferred embodiment, the controller module is used to acquire the operating conditions of the power device, and to acquire the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module; based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, it generates on / off control signals for the power device module under test and the load converter module, including:

[0068] The controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module.

[0069] Based on the inductance data, power device voltage data, and load voltage data, the load current data output by the load converter module is determined.

[0070] Based on the load current data and power device operating conditions, the reference voltage of the load converter module is obtained;

[0071] Based on the reference voltage of the load converter module, and combined with a preset triangular carrier signal, the on / off control signal of the load converter module is generated.

[0072] The voltage data of the power device is subjected to Clark transformation to obtain the modulation voltage of the power device module under test;

[0073] Based on the modulation voltage of the power device module under test, and combined with a preset triangular carrier signal, an on / off control signal for the power device module under test is generated.

[0074] This preferred solution calculates the load current data output by the load converter module using the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module. Furthermore, it dynamically generates a reference voltage for the load converter module based on different power device operating conditions, thereby generating a switching control signal for the load converter module. Then, it generates a switching control signal for the power device under test module using the reference voltage. By using the switching control signals of both the load converter module and the power device under test module, the switching of the power devices in both modules and the energy cycling are achieved, enabling low-energy-loss accelerated power cycling testing under multiple operating conditions.

[0075] As a preferred embodiment, determining the load current data output by the load converter module based on the inductance data, power device voltage data, and load voltage data includes:

[0076] The voltage difference is determined based on the power device voltage data and the load voltage data.

[0077] Obtain the power device conduction time of the power device module under test;

[0078] Based on the voltage difference, conduction time, and inductance data, the load current data output by the load converter module is determined.

[0079] This preferred solution can accurately calculate the load current data output by the load converter module by combining the voltage difference between the power device voltage data and the load voltage data with the power device conduction time. This not only avoids the additional energy loss caused by using sensor measurements, but also provides an accurate data basis for the subsequent generation of reference voltage, improving the accuracy of accelerated power cycle testing of power devices and reducing the energy loss of accelerated power cycle testing.

[0080] As a preferred embodiment, obtaining the reference voltage of the load converter module based on the load current data and the operating conditions of the power devices includes:

[0081] Perform a Park transformation on the load current data to determine the first load current data corresponding to the load current data;

[0082] The first load current data is input into a preset proportional-integral current controller, and the reference output voltage output by the preset proportional-integral current controller is obtained by combining the power device operating conditions.

[0083] The reference output voltage is subjected to an inverse Park transformation to obtain the reference voltage of the load converter module.

[0084] This preferred solution achieves decoupled control of active and reactive power through Park transformation and inverse Park transformation. The first load current data in the rotating coordinate system is obtained through Park transformation, and then converted into second load current data through different power device operating conditions. Subsequently, by using a preset proportional-integral current controller and power device operating conditions, a corresponding reference output voltage can be generated, thereby obtaining the reference voltage of the load converter module. This enables accelerated power cycle testing under multiple operating conditions and improves the accuracy of accelerated power cycle testing of power devices.

[0085] As a preferred embodiment, the rated power of the load power device in the load converter module is greater than the rated power of the power device under test in the power device under test module.

[0086] This preferred solution, by limiting the rated power of the load power devices in the load converter module to be greater than the rated power of the power devices under test in the power device under test module, can ensure that the number of replacements of the load power devices in the load converter module is reduced during long-term accelerated power cycle testing. This avoids test interruptions and system restart energy losses caused by load-side device damage, improves the accuracy of accelerated power cycle testing of power devices, and reduces the energy loss of accelerated power cycle testing.

[0087] Accordingly, this invention provides a control method for a multi-condition low-loss accelerated power cycle test device, applicable to the multi-condition low-loss accelerated power cycle test device described above.

[0088] The control method includes: acquiring the operating conditions of the power device, and acquiring the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module.

[0089] Based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, the on / off control signals for the power device module under test and the load converter module are generated.

[0090] It is understood that this invention uses the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module, and combines different power device operating conditions to dynamically generate the on / off control signals of the power device under test module and the load converter module. With the on / off control signals of the load converter module and the power device under test module respectively, the on / off of the power devices of the load converter module and the power device under test module and the energy cycle are realized, thus realizing low energy loss accelerated power cycle testing under multiple operating conditions. Attached Figure Description

[0091] Figure 1 A schematic diagram of a multi-condition, low-loss accelerated power cycle testing device provided in an embodiment of the present invention;

[0092] Figure 2 A schematic diagram of the structural connection of a multi-condition, low-loss accelerated power cycle testing device provided in an embodiment of the present invention;

[0093] Figure 3 This is a schematic diagram illustrating the working principle of an accelerated power cycle testing device provided in an embodiment of the present invention.

[0094] Figure 4 A current-voltage waveform diagram under different power device operating conditions is provided for an embodiment of the present invention;

[0095] Figure 5 A power simulation waveform diagram of a DC power supply provided for an embodiment of the present invention;

[0096] Figure 6 The flowchart illustrates the steps of a control method for a multi-condition, low-loss accelerated power cycle testing device provided in an embodiment of the present invention. Detailed Implementation

[0097] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0098] Example 1

[0099] Please refer to Figure 1 , Figure 1 A schematic diagram of a multi-condition low-loss accelerated power cycle testing device provided in an embodiment of the present invention includes: a power supply module 101, a power device under test module 102, a load converter module 104, an interactive inductor module 103, and a controller module 105.

[0100] The output terminal of the power device module 102 under test is electrically connected to the first terminal of the interactive inductor module 103.

[0101] The output terminal of the load converter module 104 is electrically connected to the second terminal of the interactive inductor module 103.

[0102] The data acquisition terminal of the controller module 105 is electrically connected to the output terminal of the power device under test module 102 and the output terminal of the load converter module 104, respectively.

[0103] The control signal output terminal of the controller module 105 is electrically connected to the control terminal of the power device under test module 102 and the control terminal of the load converter module 104, respectively.

[0104] The power module 101 is used to provide voltage to the power device under test module 102 and the load converter module 104;

[0105] The controller module 105 is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module 103, the power device voltage data output by the power device under test module 102, and the load voltage data output by the load converter module 104; based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, it generates the on / off control signal of the power device under test module 102 and the on / off control signal of the load converter module 104.

[0106] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structural connection of a multi-condition, low-loss accelerated power cycle testing device provided in an embodiment of the present invention.

[0107] In this embodiment, as Figure 2 As shown, the power device under test module 102 includes: a first power device under test T AH The second power device under test, T AL The third power device under test, T BH The fourth power device under test, T BL The fifth power device under test, T CH and the sixth power device under test T CL ;

[0108] The first power device under test T AH The collector of the device is electrically connected to the positive output terminal of the power module.

[0109] The third power device under test T BH The collector of the device is electrically connected to the positive output terminal of the power module.

[0110] The fifth power device under test T CH The collector of the device is electrically connected to the positive output terminal of the power module.

[0111] The second power device under test T AL The emitter is electrically connected to the negative output terminal of the power module;

[0112] The fourth power device under test T BL The emitter is electrically connected to the negative output terminal of the power module;

[0113] The sixth power device under test T CL The emitter is electrically connected to the negative output terminal of the power module;

[0114] The first power device under test T AH The emitter of the second power device under test T AL collector electrical connection;

[0115] The third power device under test T BH The emitter of the fourth power device under test T BL collector electrical connection;

[0116] The fifth power device under test T CH The emitter of the sixth power device under test T CL collector electrical connection;

[0117] The first power device under test T AH The emitter of the device under test (DUT) serves as the output terminal of the power device module 102 and is electrically connected to the first terminal of the interactive inductor module 103.

[0118] The first power device under test T AH The emitter is also electrically connected to the data acquisition terminal of the controller module 105;

[0119] The third power device under test T BH The emitter of the device under test (DUT) serves as the output terminal of the power device module 102 and is electrically connected to the first terminal of the interactive inductor module 103.

[0120] The third power device under test T BH The emitter is also electrically connected to the data acquisition terminal of the controller module 105;

[0121] The fifth power device under test T AH The emitter of the device under test (DUT) serves as the output terminal of the power device module 102 and is electrically connected to the first terminal of the interactive inductor module 103.

[0122] The fifth power device under test T AH The emitter is also electrically connected to the data acquisition terminal of the controller module 105;

[0123] The first power device under test T AH The base of the second power device under test, T AL The base of the third power device under test, T BH The base of the fourth power device under test, T BL The base of the fifth power device under test, T CH The base and the sixth power device under test T CL The base of each of the devices serves as the control terminal of the power device under test module 102, and is electrically connected to the control signal output terminal of the controller module 105.

[0124] This embodiment combines multiple power devices under test (DUTs) to form a three-phase full-bridge topology. This not only avoids overload of a single DUT and adapts to testing requirements under different operating conditions, but also allows the controller module to dynamically adjust the on / off state of each phase, improving the flexibility of accelerated power cycle testing. Through the cooperation between the DUT module and the load converter module, an efficient energy return path is formed, enabling energy to circulate and exchange between the load converter module and the DUT module during accelerated power cycle testing, thereby reducing energy loss during accelerated power cycle testing.

[0125] In this embodiment, as Figure 2 As shown, the load converter module 104 includes: a first load power device T AH1 Second load power device T AL1 Third load power device T BH1 Fourth load power device T BL1 Fifth load power device T CH1 and the sixth load power device T CL1 ;

[0126] The first load power device T AH1 The collector of the device is electrically connected to the positive output terminal of the power module.

[0127] The third load power device T BH1 The collector of the device is electrically connected to the positive output terminal of the power module.

[0128] The fifth load power device T CH1 The collector of the device is electrically connected to the positive output terminal of the power module.

[0129] The second load power device T AL1 The emitter is electrically connected to the negative output terminal of the power module;

[0130] The fourth load power device T BL1 The emitter is electrically connected to the negative output terminal of the power module;

[0131] The sixth load power device T CL1 The emitter is electrically connected to the negative output terminal of the power module;

[0132] The first load power device T AH1 The emitter and the second load power device T AL1 collector electrical connection;

[0133] The third load power device T BH1 The emitter of the fourth load power device T BL1collector electrical connection;

[0134] The fifth load power device T CH1 The emitter of the sixth load power device T CL1 collector electrical connection;

[0135] The first load power device T AH1 The emitter of the module serves as the output terminal of the load converter module 104 and is electrically connected to the second terminal of the interactive inductor module 103.

[0136] The first load power device T AH1 The emitter is also electrically connected to the data acquisition terminal of the controller module 105;

[0137] The third load power device T BH1 The emitter of the module serves as the output terminal of the load converter module 104 and is electrically connected to the second terminal of the interactive inductor module 103.

[0138] The third load power device T BH1 The emitter is also electrically connected to the data acquisition terminal of the controller module 105;

[0139] The fifth load power device T CH1 The emitter of the module serves as the output terminal of the load converter module 104 and is electrically connected to the second terminal of the interactive inductor module 103.

[0140] The fifth load power device T CH1 The emitter is also electrically connected to the data acquisition terminal of the controller module 105;

[0141] The first load power device T AH1 The base of the second load power device T AL1 The base of the third load power device T BH1 The base of the fourth load power device T BL1 The base of the fifth load power device T CH1 The base and the sixth load power device T CL1 The base of each of the components serves as the control terminal of the load converter module 104, and is electrically connected to the control signal output terminal of the controller module 105.

[0142] This embodiment combines multiple load power devices to form a three-phase full-bridge topology, which is the same as the topology of the power device under test module. This allows for the formation of a symmetrical and efficient energy circulation system, enabling accelerated power cycle testing under different operating conditions in conjunction with the controller module. Furthermore, by forming an efficient energy return path, energy is circulated and exchanged between the load converter module and the power device under test module during the accelerated power cycle test, thereby reducing energy loss during the accelerated power cycle test.

[0143] It should be noted that the load power device (first load power device T) in the load converter module AH1 Second load power device T AL1 Third load power device T BH1 Fourth load power device T BL1 Fifth load power device T CH1 and the sixth load power device T CL1 ), and the power device under test (the first power device under test T) in the power device under test module. AH The second power device under test, T AL The third power device under test, T BH The fourth power device under test, T BL The fifth power device under test, T CH and the sixth power device under test T CL All of them are insulated-gate bipolar transistors (IGBTs).

[0144] In this embodiment, as Figure 2 As shown, the interactive inductor module 103 includes: a first inductor L A Second inductor L B and the third inductor L C ;

[0145] The first inductor L A The first end serves as the first end of the interactive inductor module 103, which is connected to the first power device under test T. AH The emitter is electrically connected;

[0146] The second inductor L B The first terminal serves as the first terminal of the interactive inductor module 103, which is connected to the third power device under test T. BH The emitter is electrically connected;

[0147] The third inductor L C The first end serves as the first end of the interactive inductor module 103, which is connected to the fifth power device under test T. CHThe emitter is electrically connected;

[0148] The first inductor L A The second end serves as the second end of the interactive inductor module 103, which is connected to the first load power device T. AH1 The emitter is electrically connected;

[0149] The second inductor L B The second terminal serves as the second terminal of the interactive inductor module 103, which is connected to the third load power device T. BH1 The emitter is electrically connected;

[0150] The third inductor L C The second terminal serves as the second terminal of the interactive inductor module 103, which is connected to the fifth load power device T. CH1 The emitter is electrically connected.

[0151] This embodiment uses a first inductor, a second inductor, and a third inductor to form an inductor module. Through its connection with the power device under test (DUT) module and the load converter module, it ensures the independence and flexibility of phase control. This allows the controller module to independently control the accelerated power cycle test of each phase, thereby ensuring accurate simulation of complex operating conditions such as three-phase imbalance and improving the accuracy of accelerated power cycle testing of power devices. The inductor module enables energy exchange between the DUT module and the load converter module, requiring only a small inductance value. This small inductance value reduces additional energy loss, further lowering the energy loss during accelerated power cycle testing.

[0152] In this embodiment, as Figure 2 As shown, the power module 101 includes: a DC power supply VDC, a capacitor C1, and a fuse F;

[0153] The positive and negative output terminals of the DC power supply VDC are both used as the output terminals of the power module 101.

[0154] The positive and negative output terminals of the DC power supply VDC are both electrically connected to the input terminal of the power device module 102 under test.

[0155] The positive and negative output terminals of the DC power supply VDC are both electrically connected to the input terminal of the load converter module 104.

[0156] The first terminal of the capacitor C1 is electrically connected to the positive output terminal of the DC power supply VDC.

[0157] The second terminal of the capacitor C1 is electrically connected to the negative output terminal of the DC power supply VDC.

[0158] The first end of the fuse F is electrically connected to the positive output terminal of the DC power supply VDC;

[0159] The second end of the fuse F is electrically connected to the input end of the power device under test module 102;

[0160] The second end of the fuse F is electrically connected to the input end of the load converter module 104.

[0161] This embodiment uses a combination of capacitors and fuses to ensure the stability and safety of multi-condition testing, thereby enabling the accelerated power cycle testing device to operate for a long time in a low-loss mode.

[0162] In this embodiment, as Figure 2 As shown, the controller module is a DSP controller; a DSP controller (Digital Signal Processor Controller) is a microprocessor designed for high-speed, real-time processing of digital signals.

[0163] In this embodiment, the controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module; based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, it generates on / off control signals for the power device module under test and the load converter module, including:

[0164] The controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module.

[0165] Based on the inductance data, power device voltage data, and load voltage data, the load current data output by the load converter module is determined.

[0166] Based on the load current data and power device operating conditions, the reference voltage of the load converter module is obtained;

[0167] Based on the reference voltage of the load converter module, and combined with a preset triangular carrier signal, the on / off control signal of the load converter module is generated.

[0168] The voltage data of the power device is subjected to Clark transformation to obtain the modulation voltage of the power device module under test;

[0169] Based on the modulation voltage of the power device module under test, and combined with a preset triangular carrier signal, an on / off control signal for the power device module under test is generated.

[0170] This embodiment calculates the load current data output by the load converter module using the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module. Furthermore, it dynamically generates a reference voltage for the load converter module based on different power device operating conditions, thereby generating a switching control signal for the load converter module. Then, it generates a switching control signal for the power device under test module using the reference voltage. By using the switching control signals of both the load converter module and the power device under test module, the switching of the power devices in both modules and the energy cycling are achieved, enabling low-energy-loss accelerated power cycling testing under multiple operating conditions.

[0171] In this embodiment, determining the load current data output by the load converter module based on the inductance data, power device voltage data, and load voltage data includes:

[0172] The voltage difference is determined based on the power device voltage data and the load voltage data.

[0173] Obtain the power device conduction time of the power device module under test;

[0174] Based on the voltage difference, conduction time, and inductance data, the load current data output by the load converter module is determined.

[0175] This embodiment uses the voltage difference between the power device voltage data and the load voltage data, combined with the power device conduction time, to accurately calculate the load current data output by the load converter module. This not only avoids the additional energy loss caused by using sensor measurements, but also provides an accurate data basis for the subsequent generation of reference voltage, improving the accuracy of accelerated power cycle testing of power devices and reducing the energy loss of accelerated power cycle testing.

[0176] In this embodiment, obtaining the reference voltage of the load converter module based on the load current data and power device operating conditions includes:

[0177] Perform a Park transformation on the load current data to determine the first load current data corresponding to the load current data;

[0178] The first load current data is input into a preset proportional-integral current controller, and the reference output voltage output by the preset proportional-integral current controller is obtained by combining the power device operating conditions.

[0179] The reference output voltage is subjected to an inverse Park transformation to obtain the reference voltage of the load converter module.

[0180] This embodiment achieves decoupled control of active and reactive power through Park transformation and inverse Park transformation. The first load current data in the rotating coordinate system is obtained through Park transformation, and then converted into second load current data through different power device operating conditions. Subsequently, by using a preset proportional-integral current controller and power device operating conditions, a corresponding reference output voltage can be generated, thereby obtaining the reference voltage of the load converter module. This enables accelerated power cycle testing under multiple operating conditions and improves the accuracy of accelerated power cycle testing of power devices.

[0181] In this embodiment, the rated power of the load power device in the load converter module is greater than the rated power of the power device under test in the power device under test module.

[0182] This embodiment limits the rated power of the load power device in the load converter module to be greater than the rated power of the power device under test in the power device under test module. This ensures that the number of times the load power device in the load converter module needs to be replaced is reduced during long-term accelerated power cycle testing. It avoids test interruptions and system restart energy losses caused by load-side device damage, improves the accuracy of accelerated power cycle testing of power devices, and reduces the energy loss of accelerated power cycle testing.

[0183] In an alternative embodiment, such as Figure 2 As shown, both the power device under test module 102 and the load converter module 104 are three-phase full-bridge structures. Based on the connection characteristics of the three-phase full-bridge structure, the working principle of each phase is the same. Among them, the first power device under test T... AH Second power device under test T AL Phase A of the power device under test module 102, and the third power device under test T BH and the fourth power device under test T BL Phase B of the power device under test module 102, and the fifth power device under test T CH and the sixth power device under test T CL Phase C of the power device under test module 102; the first load power device T AH1 Second load power device T AL1 Phase A of the load converter module 104, the third load power device T BH1 and the fourth load power device T BL1 Phase B of the load converter module 104, the fifth load power device T CH1 and the sixth load power device T CL1Phase C constitutes the load converter module 104; therefore, in this embodiment, the working principle between phase A of the power device module 102 under test and phase A of the load converter module 104 is described, while the working principles of phases B and C are consistent with those of phase A.

[0184] For further details, please refer to... Figure 3 , Figure 3 This is a schematic diagram illustrating the working principle of an accelerated power cycle testing device provided in an embodiment of the present invention; as shown below. Figure 3 As shown, this illustrates the working principle between phase A of the power device module 102 under test and phase A of the load converter module 104.

[0185] Taking phase A as an example, firstly, the inductance data of the interactive inductor module (i.e., the first inductor L) is obtained. A inductance value L a The power device voltage data output by the power device module 102 under test (including the A-phase voltage U of the power device) A ) and the load voltage data U output by the load converter module A1 Then, based on the power device voltage data U A and load voltage data U A1 Determine the voltage difference V LA ; Obtain the power device conduction time t of the power device module under test; then, based on the voltage difference V LA On-time t and inductance data L a Determine the load current data I output by the load converter module. A ;in,

[0186] Then, a Park transformation is performed on the load current data to determine the first load current data corresponding to the load current data; specifically, I A It can be considered as a current I in the α-β coordinate system αA Then I αA A phase shift of 90 degrees yields I βA Then, obtain the angle θ; the period of angle θ is 20ms, the frequency is 50Hz, and the transformation range is [0, 2π] (angle θ is commonly used in coordinate system transformation of voltage and current, and will not be elaborated on here); then, based on I... αA θ angle and I βA To perform the Park transformation, first convert I... αA Convert to the corresponding voltage U αA I βA Convert to the corresponding voltage U βA Then, the Park transformation is performed to obtain U. dA and U qA Specifically, the voltage U βASubstituting U into the formula for the Park transform β , will voltage U αA Substituting U into the formula for the Park transform α The calculated U d That is, U dA The calculated U q That is, U qA ;

[0187] The formula for the Park transform is:

[0188] Among them, U dA and U qA Perform voltage-to-current conversion to obtain the current I on the d-axis. d and the q-axis current I q Since this is phase A, we obtain I. dA and I qA That is, the first load current data is I. dA and I qA ;

[0189] It is important to note that in the dq coordinate system, active power is controlled by the d-axis and reactive power by the q-axis. Therefore, the power factor of the current output by the load converter module can be changed by altering the amplitude and polarity of the d-axis and q-axis currents, i.e., by changing I... dA and I qA The amplitude and polarity of the d-axis and q-axis currents are adjusted to change the power factor, and parameters such as output frequency, output current and voltage, and switching frequency are set so that the accelerated power cycle test device can simulate different operating conditions. In this embodiment, the amplitude and polarity of the d-axis and q-axis currents are changed through a PI controller.

[0190] Specifically, setting the operating conditions of the power devices includes: d-axis reference current I d_ref q-axis reference current I q_ref d-axis voltage compensation term ωLi q and q-axis voltage compensation term ωLi d ; Transfer the first load current data I dA and I qA Input a preset proportional-integral current controller (PI controller), combined with the d-axis reference current I. d_ref q-axis reference current I q_ref d-axis voltage compensation term ωLi q and q-axis voltage compensation term ωLi d The reference output voltage V is obtained. d1_ref and V q1_ref ;

[0191] Then the reference output voltage Vd1_ref and V q1_ref Perform an inverse Park transform to obtain the reference voltage V of the load converter module. loadA_ref The inverse Park transform is the opposite of the Park transform, and its formula is as follows: V d1_ref Substituting U into the formula for the inverse Park transform d V q1_ref Substituting U into the formula for the inverse Park transform q , get U α and U β U α and U β This is the reference voltage V of the load converter module. loadA_ref ;

[0192] Then, the preset triangular carrier signal frequency is set to 10kHz, and the reference voltage V of the load converter module is set to... loadA_ref It is compared with the preset triangular carrier signal. If it is the reference voltage V of the load converter module... loadA_ref If the corresponding modulation signal is higher than the preset triangular carrier signal, it is a high-level signal; otherwise, it is a low-level signal. The on / off control signal PWM2 of the load converter module is obtained by statistical comparison.

[0193] The power device voltage data is then subjected to Clark transformation. Specifically, the power device voltage data includes: the A-phase voltage U of the power device. A Phase B voltage U of power devices B and the C-phase voltage U of the power device C The formula for calculating the Clark transform is:

[0194] The A-phase voltage U of the power device A Phase B voltage U of power devices B and the C-phase voltage U of the power device C Substitute U into the Clark transform calculation formula respectively a U b and U c Calculations yielded That is, the modulation voltage V of the power device module under test. testA_ref ;

[0195] Then the modulation voltage V of the power device module under test is... testA_ref It is compared with a preset triangular carrier signal. If it is the modulation voltage V of the power device module under test, then... testA_refIf the corresponding modulation signal is higher than the preset triangular carrier signal, it is a high-level signal; otherwise, it is a low-level signal. The on / off control signal PWM1 of the power device module under test is obtained by statistical comparison.

[0196] It should be noted that Park's transformation is a mathematical transformation used in motor control and three-phase system analysis. Its core idea is to project the time-varying AC current or voltage vector in the three-phase stationary coordinate system (ABC coordinate system) onto a coordinate system with a direct axis (d-axis) and a quadrature axis (q-axis) that rotates synchronously with the rotor magnetic field. The PI controller is a widely used feedback controller in industrial control systems. It stands for "Proportional-Integral" control. Its core objective is to generate a control signal by calculating the "deviation" (the difference between the setpoint and the actual value) and performing proportional and integral operations, thereby enabling the system output to ultimately achieve the desired setpoint accurately and stably. The Clark transformation converts a three-phase stationary coordinate system (ABC) that is 120° apart into a two-phase stationary coordinate system (α-β) that is perpendicular to each other.

[0197] Based on the above working principle, the multi-condition low-loss accelerated power cycle test device provided in this embodiment, after the first load current data is input into a preset proportional-integral current controller (PI controller), sets parameters such as output frequency, output current and voltage, power factor, and switching frequency through the PI controller to simulate various operating conditions under different working conditions, thereby realizing multi-condition accelerated power cycle test.

[0198] For further details, please refer to Figure 4 , Figure 4 A current-voltage waveform diagram under different power device operating conditions is provided for an embodiment of the present invention; Figure 4 The test includes Figures (a) and (b). Figure (a) shows the current and voltage waveforms when the DC power supply is 400V, the power factor is 1, and the switching frequency is 50Hz. Figure (b) shows the current and voltage waveforms when the DC power supply is 400V, the power factor is -1, and the switching frequency is 50Hz. As shown in Figure (a), the power factor is 1, which is the motor mode, and the losses of the IGBT devices in the accelerated power cycle test device dominate. At this time, the load current data I output by the load converter module is... A The voltage is 10A; the A-phase voltage U of the power device output by the power device module under test is... A The voltage is 200V; however, in Figure (b), the power factor is -1, indicating generation mode, and the load current data I output by the load converter module is... A The voltage is 10A; the A-phase voltage U of the power device output by the power device module under test is... AThe voltage is 200V; although the current and voltage amplitudes are the same, due to different power device operating conditions, it can be seen from Figures (a) and (b) that the load current data I... A and the A-phase voltage U of the power device A The waveform relationship between them is inconsistent under different power device operating conditions.

[0199] In an optional embodiment, based on the working principle of the multi-condition low-loss accelerated power cycle test device described in this embodiment, only the power loss of the power device module under test and the load converter module, i.e., the conduction and disconnection losses of the IGBT device, and the inductance loss in the interactive inductor module, are considered. Since the inductance value in the interactive inductor module is very small, although the accelerated power cycle test device still outputs current, its power loss can still be kept at a low level. Furthermore, based on the working principle of the multi-condition low-loss accelerated power cycle test device described in this embodiment, simulation experiments are conducted to obtain the following results: Figure 5 Please refer to the waveform diagram shown. Figure 5 , Figure 5 A power simulation waveform diagram of a DC power supply provided for an embodiment of the present invention; as shown. Figure 5 As shown, the horizontal axis represents time, and the vertical axis represents the P value, i.e., the power value of the DC power supply. The power value of the DC power supply in the power module alternates between positive and negative. When the power value is positive, i.e., P > 0, it means that the accelerated power cycle test device absorbs power from the grid. When the power value is negative, i.e., P < 0, it means that the accelerated power cycle test device feeds power back to the grid. The average of the entire power simulation waveform is still relatively low, indicating that the accelerated power cycle test device consumes relatively low energy. Therefore, low-energy-loss accelerated power cycle test is achieved.

[0200] This embodiment constructs a multi-condition, low-loss accelerated power cycle testing device using a power supply module, a power device under test (DUT) module, a load converter module, an interactive inductor module, and a controller module. By combining the inductance data from the interactive inductor module, the power device voltage data output from the DUT module, and the load voltage data output from the load converter module, along with different power device operating conditions, the device can dynamically generate on / off control signals for both the DUT and load converter modules, thus achieving multi-condition accelerated power cycle testing. The connection between the load converter module, DUT module, and interactive inductor module allows energy to be cyclically exchanged between the load converter module and the DUT module during the accelerated power cycle testing process, thereby reducing energy loss during the accelerated power cycle testing.

[0201] Example 2

[0202] Please refer to Figure 6 , Figure 6 The flowchart of the control method for a multi-condition low-loss accelerated power cycle test device provided in the embodiment of the present invention is applicable to the multi-condition low-loss accelerated power cycle test device as described in Embodiment 1 above; the control method includes steps S201 to S202.

[0203] Step S201: Obtain the operating conditions of the power device, and obtain the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module.

[0204] Step S202: Based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, generate the on / off control signal for the power device module under test and the on / off control signal for the load converter module.

[0205] In this embodiment, generating the on / off control signal for the power device module under test and the on / off control signal for the load converter module based on the inductance data, power device voltage data, power device operating conditions, and load voltage data includes:

[0206] Based on the inductance data, power device voltage data, and load voltage data, the load current data output by the load converter module is determined.

[0207] Based on the load current data and power device operating conditions, the reference voltage of the load converter module is obtained;

[0208] Based on the reference voltage of the load converter module, and combined with a preset triangular carrier signal, the on / off control signal of the load converter module is generated.

[0209] The voltage data of the power device is subjected to Clark transformation to obtain the modulation voltage of the power device module under test;

[0210] Based on the modulation voltage of the power device module under test, and combined with a preset triangular carrier signal, an on / off control signal for the power device module under test is generated.

[0211] In this embodiment, determining the load current data output by the load converter module based on the inductance data, power device voltage data, and load voltage data includes:

[0212] The voltage difference is determined based on the power device voltage data and the load voltage data.

[0213] Obtain the power device conduction time of the power device module under test;

[0214] Based on the voltage difference, conduction time, and inductance data, the load current data output by the load converter module is determined.

[0215] In this embodiment, obtaining the reference voltage of the load converter module based on the load current data and power device operating conditions includes:

[0216] Perform a Park transformation on the load current data to determine the first load current data corresponding to the load current data;

[0217] The first load current data is input into a preset proportional-integral current controller, and the reference output voltage output by the preset proportional-integral current controller is obtained by combining the power device operating conditions.

[0218] The reference output voltage is subjected to an inverse Park transformation to obtain the reference voltage of the load converter module.

[0219] The control method provided in this embodiment is applicable to a multi-condition low-loss accelerated power cycle testing device as described in Embodiment 1 above. Therefore, for the specific implementation process of the control method, please refer to the description of the working principle in Embodiment 1. This embodiment will not elaborate further here.

[0220] This invention uses the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module. Combined with different power device operating conditions, it dynamically generates the on / off control signals of the power device under test module and the load converter module. With the on / off control signals of the load converter module and the power device under test module respectively, the on / off of the power devices of the load converter module and the power device under test module are realized, as well as the energy cycle, achieving low energy loss accelerated power cycle testing under multiple operating conditions.

[0221] In summary, the embodiments of the present invention constitute a multi-condition, low-loss accelerated power cycle testing device by means of a power supply module, a power device under test module, a load converter module, an interactive inductor module, and a controller module. By using the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module, combined with different power device operating conditions, the on / off control signals of the power device module under test and the load converter module can be dynamically generated, thereby realizing multi-condition accelerated power cycle testing. Through the connection of the load converter module, the power device module under test, and the interactive inductor module, energy is cyclically exchanged between the load converter module and the power device module under test during the accelerated power cycle testing process, thereby reducing the energy loss of the accelerated power cycle testing.

[0222] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A multi-condition, low-loss accelerated power cycle testing device, characterized in that, include: Power supply module, power device under test module, load converter module, interactive inductor module and controller module; The output terminal of the power device under test module is electrically connected to the first terminal of the interactive inductor module. The output terminal of the load converter module is electrically connected to the second terminal of the interactive inductor module. The data acquisition terminal of the controller module is electrically connected to the output terminal of the power device under test module and the output terminal of the load converter module, respectively. The control signal output terminal of the controller module is electrically connected to the control terminal of the power device under test module and the control terminal of the load converter module, respectively. The power module is used to provide voltage to the power device under test module and the load converter module; The controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module; based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, it generates the on / off control signal of the power device module under test and the on / off control signal of the load converter module.

2. The multi-condition low-loss accelerated power cycle testing device as described in claim 1, characterized in that, The power device under test module includes: a first power device under test, a second power device under test, a third power device under test, a fourth power device under test, a fifth power device under test, and a sixth power device under test; The collector of the first power device under test is electrically connected to the positive output terminal of the power module; The collector of the third power device under test is electrically connected to the positive output terminal of the power supply module. The collector of the fifth power device under test is electrically connected to the positive output terminal of the power supply module. The emitter of the second power device under test is electrically connected to the negative output terminal of the power module; The emitter of the fourth power device under test is electrically connected to the negative output terminal of the power module. The emitter of the sixth power device under test is electrically connected to the negative output terminal of the power module. The emitter of the first power device under test is electrically connected to the collector of the second power device under test; The emitter of the third power device under test is electrically connected to the collector of the fourth power device under test. The emitter of the fifth power device under test is electrically connected to the collector of the sixth power device under test; The emitter of the first power device under test serves as the output terminal of the power device under test module and is electrically connected to the first terminal of the interactive inductor module. The emitter of the first power device under test is also electrically connected to the data acquisition terminal of the controller module; The emitter of the third power device under test serves as the output terminal of the power device under test module and is electrically connected to the first terminal of the interactive inductor module. The emitter of the third power device under test is also electrically connected to the data acquisition terminal of the controller module; The emitter of the fifth power device under test serves as the output terminal of the power device under test module and is electrically connected to the first terminal of the interactive inductor module. The emitter of the fifth power device under test is also electrically connected to the data acquisition terminal of the controller module; The bases of the first power device under test, the second power device under test, the third power device under test, the fourth power device under test, the fifth power device under test, and the sixth power device under test all serve as the control terminals of the power device under test module, and are all electrically connected to the control signal output terminal of the controller module.

3. The multi-condition low-loss accelerated power cycle testing device as described in claim 2, characterized in that, The load converter module includes: a first load power device, a second load power device, a third load power device, a fourth load power device, a fifth load power device, and a sixth load power device. The collector of the first load power device is electrically connected to the positive output terminal of the power module; The collector of the third load power device is electrically connected to the positive output terminal of the power module. The collector of the fifth load power device is electrically connected to the positive output terminal of the power supply module. The emitter of the second load power device is electrically connected to the negative output terminal of the power module; The emitter of the fourth load power device is electrically connected to the negative output terminal of the power module. The emitter of the sixth load power device is electrically connected to the negative output terminal of the power module. The emitter of the first load power device is electrically connected to the collector of the second load power device; The emitter of the third load power device is electrically connected to the collector of the fourth load power device. The emitter of the fifth load power device is electrically connected to the collector of the sixth load power device; The emitter of the first load power device serves as the output terminal of the load converter module and is electrically connected to the second terminal of the interactive inductor module. The emitter of the first load power device is also electrically connected to the data acquisition terminal of the controller module; The emitter of the third load power device serves as the output terminal of the load converter module and is electrically connected to the second terminal of the interactive inductor module. The emitter of the third load power device is also electrically connected to the data acquisition terminal of the controller module; The emitter of the fifth load power device serves as the output terminal of the load converter module and is electrically connected to the second terminal of the interactive inductor module. The emitter of the fifth load power device is also electrically connected to the data acquisition terminal of the controller module; The bases of the first load power device, the second load power device, the third load power device, the fourth load power device, the fifth load power device, and the sixth load power device all serve as the control terminals of the load converter module, and are all electrically connected to the control signal output terminal of the controller module.

4. The multi-condition low-loss accelerated power cycle testing device as described in claim 3, characterized in that, The interactive inductor module includes: a first inductor, a second inductor, and a third inductor; The first end of the first inductor serves as the first end of the interactive inductor module, and is electrically connected to the emitter of the first power device under test. The first end of the second inductor serves as the first end of the interactive inductor module, and it is electrically connected to the emitter of the third power device under test. The first end of the third inductor serves as the first end of the interactive inductor module, and it is electrically connected to the emitter of the fifth power device under test. The second end of the first inductor serves as the second end of the interactive inductor module, and is electrically connected to the emitter of the first load power device. The second end of the second inductor serves as the second end of the interactive inductor module, and is electrically connected to the emitter of the third load power device; The second end of the third inductor serves as the second end of the interactive inductor module, and is electrically connected to the emitter of the fifth load power device.

5. The multi-condition low-loss accelerated power cycle testing device as described in claim 1, characterized in that, The power module includes: a DC power supply, a capacitor, and a fuse; Both the positive and negative output terminals of the DC power supply serve as the output terminals of the power module. Both the positive and negative output terminals of the DC power supply are electrically connected to the input terminal of the power device module under test. The positive and negative output terminals of the DC power supply are both electrically connected to the input terminal of the load converter module. The first terminal of the capacitor is electrically connected to the positive output terminal of the DC power supply. The second terminal of the capacitor is electrically connected to the negative output terminal of the DC power supply. The first end of the fuse is electrically connected to the positive output terminal of the DC power supply; The second end of the fuse is electrically connected to the input end of the power device module under test; The second end of the fuse is electrically connected to the input end of the load converter module.

6. A multi-condition low-loss accelerated power cycle testing device as described in any one of claims 1 to 5, characterized in that, The controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module; based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, it generates on / off control signals for the power device module under test and the load converter module, including: The controller module is used to acquire the operating conditions of the power devices, as well as the inductance data of the interactive inductor module, the power device voltage data output by the power device under test module, and the load voltage data output by the load converter module. Based on the inductance data, power device voltage data, and load voltage data, the load current data output by the load converter module is determined. Based on the load current data and power device operating conditions, the reference voltage of the load converter module is obtained; Based on the reference voltage of the load converter module, and combined with a preset triangular carrier signal, the on / off control signal of the load converter module is generated. The voltage data of the power device is subjected to Clark transformation to obtain the modulation voltage of the power device module under test; Based on the modulation voltage of the power device module under test, and combined with a preset triangular carrier signal, an on / off control signal for the power device module under test is generated.

7. The multi-condition low-loss accelerated power cycle testing device as described in claim 6, characterized in that, The determination of the load current data output by the load converter module based on the inductance data, power device voltage data, and load voltage data includes: The voltage difference is determined based on the power device voltage data and the load voltage data. Obtain the power device conduction time of the power device module under test; Based on the voltage difference, conduction time, and inductance data, the load current data output by the load converter module is determined.

8. The multi-condition low-loss accelerated power cycle testing device as described in claim 7, characterized in that, The step of obtaining the reference voltage of the load converter module based on the load current data and power device operating conditions includes: Perform a Park transformation on the load current data to determine the first load current data corresponding to the load current data; The first load current data is input into a preset proportional-integral current controller, and the reference output voltage output by the preset proportional-integral current controller is obtained by combining the power device operating conditions. The reference output voltage is subjected to an inverse Park transformation to obtain the reference voltage of the load converter module.

9. The multi-condition low-loss accelerated power cycle testing device as described in claim 3, characterized in that, The rated power of the load power device in the load converter module is greater than the rated power of the power device under test in the power device under test module.

10. A control method for a multi-condition, low-loss accelerated power cycle testing device, characterized in that, Applicable to a multi-condition low-loss accelerated power cycle testing device as described in any one of claims 1 to 9; The control method includes: acquiring the operating conditions of the power device, and acquiring the inductance data of the interactive inductor module, the power device voltage data output by the power device module under test, and the load voltage data output by the load converter module. Based on the inductance data, power device voltage data, power device operating conditions, and load voltage data, the on / off control signals for the power device module under test and the load converter module are generated.

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