High-voltage testing device of power module

Abstract

The utility model discloses a high-voltage test device for a power module. The high-voltage test device comprises a high-voltage test area, a low-voltage auxiliary area and a test operation area, the high-voltage test area comprises a tested power module, a high-voltage test instrument, a low-voltage-to-high-voltage power supply loop, a discharge loop and a high-voltage test instrument power supply loop; the low-voltage auxiliary area comprises a tested power module driving circuit and a driving signal measuring circuit; the test operation area comprises a test operation assembly, a signal control assembly, a signal control switch and a three-phase transformer; three-phase voltage is input to the low-voltage-to-high-voltage power supply loop through the three-phase transformer. The device can meet the current and voltage experiment conditions of the high-voltage power device test, can carry out the double-pulse test of the IGCT power module, facilitates the rapid and repeated construction of a test platform, achieves the safe isolation of high voltage and low voltage, is safe in operation, has a power failure protection function, and can effectively prevent the damage of the tested high-voltage power module caused by the accidental power failure of the test platform.

Description

Technical Field

[0001] The utility model relates to the technical field of testing, in particular to a high-voltage testing device for a power module. Background Art

[0002] The existing high-voltage inverter test method tests the voltage and current stress of the power module IGCT, diode, and buffer inductor. It is necessary to use a towing motor loading platform with the same power as the inverter or an aging inductor with the same current to achieve the voltage and current test conditions of the inverter power part. For the high-voltage inverter test platform, the cost of tens of MW-level motors is expensive, and the test capacity is difficult to configure. It is difficult to build such a high-power test platform in a general factory or laboratory. Therefore, the stress of the power device of the high-voltage inverter in the existing technology is often measured directly in the actual field application. However, there are too many uncontrollable factors in the field application test, and time is not sufficient, so the adequacy of the test cannot be guaranteed.

[0003] Therefore, there is an urgent need for a high-voltage test device that is voltage and current controllable, easy to operate, safe, reliable, and economical to fully test the stress of high-voltage inverter power devices. Utility Model Content

[0004] The technical problem to be solved by the utility model is to propose a high-voltage test device for a power module, which can meet the current and voltage experimental conditions for testing high-voltage power devices, can perform a double-pulse test on an IGCT power module, is convenient for rapid and repeated construction of a test platform, has safe isolation between high voltage and low voltage, is safe to operate, and has a power-off protection function, which can effectively prevent damage to the high-voltage power module under test caused by an accidental power-off of the test platform.

[0005] In order to solve the above technical problems, the utility model provides a high-voltage test device for a power module, comprising a high-voltage test area, a low-voltage auxiliary area and a test operation area; the high-voltage test area comprises a power module to be tested, a high-voltage test instrument, a low-voltage boost power supply circuit, a discharge circuit, and a high-voltage test instrument power supply circuit; the low-voltage auxiliary area comprises a power module drive circuit to be tested and a drive signal measurement circuit; the test operation area comprises a test operation component, a signal control component, a signal control switch and a three-phase transformer;

[0006] The three-phase voltage is input into the low-voltage boost power supply circuit through the three-phase transformer, the output end of the low-voltage boost power supply circuit is connected to the discharge circuit and the power module under test, the high-voltage test instrument is connected to the high-voltage test instrument power supply circuit and the power module under test, the signal control component is communicatively connected to the power module under test drive circuit and the high-voltage test instrument, the drive signal output end of the power module under test drive circuit is connected to the drive signal input end of the power module under test, the test operation component is connected to the low-voltage boost power supply circuit and the discharge circuit through the signal control switch, and the test operation component is connected to the three-phase transformer and the signal control component.

[0007] Preferably, the low-voltage to high-voltage power supply circuit includes a control protection switch, a first contactor, a step-up transformer, a rectifier module, and a capacitor module; the high-voltage test instrument power supply circuit includes a high-voltage isolation transformer and a UPS power supply; the control protection switch is connected to the rectifier module through the first contactor, and the rectifier module is connected to the capacitor module.

[0008] Preferably, the capacitor module is connected to the measured power module, the discharge circuit includes a discharge template and a second contactor, and the capacitor module is connected to the discharge module via the second contactor.

[0009] Preferably, the measured power module driving circuit includes a switch, a signal generator, a UPS power supply, and an electro-optical conversion module, and the driving signal measurement circuit includes an oscilloscope;

[0010] The signal control component is communicatively connected to the switch, the switch is connected to the control of the signal generator and the oscilloscope, the signal generator is connected to the electro-optical conversion module, and the drive signal output end of the electro-optical conversion module is connected to the drive signal input end of the power module under test.

[0011] Preferably, the high-voltage test instrument power supply circuit includes a high-voltage isolation transformer and a UPS power supply, the city power voltage supplies power to the UPS power supply through the high-voltage isolation transformer, and the UPS power supply supplies power to the high-voltage test instrument.

[0012] Preferably, the test operation component is connected to the first contactor via a boost input power-on control switch S1, and the test operation component is connected to the second contactor via a capacitor module discharge control switch S2.

[0013] After adopting the above device, the high-voltage test device of the power module includes a high-voltage test area, a low-voltage auxiliary area and a test operation area; the high-voltage test area includes the power module under test, a high-voltage test instrument, a low-voltage boost power supply circuit, a discharge circuit, and a high-voltage test instrument power supply circuit, and the low-voltage auxiliary area includes the power module under test drive circuit and the drive signal measurement circuit; the test operation area includes a test operation component, a signal control component, a signal control switch and a three-phase transformer; the three-phase voltage is input to the low-voltage boost power supply circuit through the three-phase transformer, the output end of the low-voltage boost power supply circuit is connected to the discharge circuit and the power module under test, the high-voltage test instrument is connected to the high-voltage test instrument power supply circuit and the power module under test, and the The signal control component is communicatively connected with the drive circuit of the power module under test and the high-voltage test instrument, the drive signal output end of the drive circuit of the power module under test is connected with the drive signal input end of the power module under test, the test operation component is connected with the low-voltage boost power supply circuit and the discharge circuit through the signal control switch, and the test operation component is connected with the three-phase transformer and the signal control component; the high-voltage test device of the power module can meet the current and voltage experimental conditions for high-voltage power device testing, can carry out double-pulse tests on IGCT power modules, facilitate rapid and repeated construction of the test platform, safely isolate high and low voltage, operate safely, and have power-off protection function, which can effectively prevent damage to the high-voltage power module under test caused by accidental power off of the test platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an overall system diagram of the high voltage test device for the power module of the utility model;

[0015] Figure 2 A circuit diagram of a high voltage test area of ​​a high voltage test device for a power module of the utility model;

[0016] Figure 3 A circuit diagram of a low voltage test area of ​​a high voltage test device for a power module of the utility model;

[0017] Figure 4 A circuit diagram of a test operation area of ​​a high voltage test device for a power module of the utility model;

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Example

[0021] See also Figures 1 to 4 , Figure 1 This is the overall system diagram of the high voltage test device for the power module of the utility model. Figure 2 3 is a circuit diagram of a high voltage test area of ​​a high voltage test device for a power module of the utility model, 4 is a circuit diagram of a low voltage test area of ​​a high voltage test device for a power module of the utility model, Figure 4 A circuit diagram of a test operation area of ​​a high voltage test device for a power module of the utility model;

[0022] The present embodiment discloses a high-voltage test device for a power module, including a high-voltage test area, a low-voltage auxiliary area and a test operation area; the high-voltage test area includes a power module to be tested, a high-voltage test instrument, a low-voltage boost power supply circuit, a discharge circuit, and a high-voltage test instrument power supply circuit; the low-voltage auxiliary area includes a power module to be tested drive circuit and a drive signal measurement circuit; the test operation area includes a test operation component, a signal control component, a signal control switch and a three-phase transformer;

[0023] The three-phase voltage is input into the low-voltage boost power supply circuit through the three-phase transformer, the output end of the low-voltage boost power supply circuit is connected to the discharge circuit and the power module under test, the high-voltage test instrument is connected to the high-voltage test instrument power supply circuit and the power module under test, the signal control component is communicatively connected to the power module under test drive circuit and the high-voltage test instrument, the drive signal output end of the power module under test drive circuit is connected to the drive signal input end of the power module under test, the test operation component is connected to the low-voltage boost power supply circuit and the discharge circuit through the signal control switch, and the test operation component is connected to the three-phase transformer and the signal control component. Example

[0024] This embodiment is based on the first embodiment. In this embodiment, the low-voltage to high-voltage power supply circuit includes a control protection switch, a first contactor, a step-up transformer, a rectifier module, and a capacitor module. The high-voltage test instrument power supply circuit includes a high-voltage isolation transformer and a UPS power supply. The control protection switch is connected to the rectifier module through the first contactor, and the rectifier module is connected to the capacitor module.

[0025] The capacitor module is connected to the measured power module, the discharge circuit includes a discharge template and a second contactor, and the capacitor module is connected to the discharge module through the second contactor;

[0026] In this embodiment, the high-voltage test instrument power supply circuit includes a high-voltage isolation transformer and a UPS power supply. The city power voltage supplies power to the UPS power supply through the high-voltage isolation transformer, and the UPS power supply supplies power to the high-voltage test instrument. Example

[0027] This embodiment is based on the first embodiment. In this embodiment, the power module driving circuit under test includes a switch, a signal generator, a UPS power supply, an electro-optical conversion module and an oscilloscope;

[0028] The signal control component is communicatively connected to the switch, the switch is connected to the control of the signal generator and the oscilloscope, the signal generator is connected to the electro-optical conversion module, and the drive signal output end of the electro-optical conversion module is connected to the drive signal input end of the power module under test. Example

[0029] This embodiment is based on the first embodiment. In this embodiment, the test operation component is connected to the first contactor through the boost input power-on control switch S1, and the test operation component is connected to the second contactor through the capacitor module discharge control switch S2.

[0030] The high-voltage test device of the power module can meet the current and voltage experimental conditions of high-voltage power device testing, and can perform double-pulse tests on IGCT power modules, which is convenient for rapid and repeated construction of the test platform. The high-voltage and low-voltage are safely isolated, and the operation is safe. It has a power-off protection function, which can effectively prevent the damage of the high-voltage power module under test caused by accidental power off of the test platform.

[0031] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the present application is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. A high voltage test device for a power module, characterized in that: It includes a high-voltage test area, a low-voltage auxiliary area and a test operation area; the high-voltage test area includes a power module under test, a high-voltage test instrument, a low-voltage boost power supply circuit, a discharge circuit, and a high-voltage test instrument power supply circuit; the low-voltage auxiliary area includes a power module under test drive circuit and a drive signal measurement circuit; the test operation area includes a test operation component, a signal control component, a signal control switch and a three-phase transformer; The three-phase voltage is input into the low-voltage boost power supply circuit through the three-phase transformer, the output end of the low-voltage boost power supply circuit is connected to the discharge circuit and the power module under test, the high-voltage test instrument is connected to the high-voltage test instrument power supply circuit and the power module under test, the signal control component is communicatively connected to the power module under test drive circuit and the high-voltage test instrument, the drive signal output end of the power module under test drive circuit is connected to the drive signal input end of the power module under test, the test operation component is connected to the low-voltage boost power supply circuit and the discharge circuit through the signal control switch, and the test operation component is connected to the three-phase transformer and the signal control component.

2. The high voltage testing device for a power module according to claim 1, characterized in that: The low-voltage to high-voltage power supply circuit includes a control protection switch, a first contactor, a step-up transformer, a rectifier module, and a capacitor module; the high-voltage test instrument power supply circuit includes a high-voltage isolation transformer and a UPS power supply; the control protection switch is connected to the rectifier module through the first contactor, and the rectifier module is connected to the capacitor module.

3. The high voltage testing device for a power module according to claim 2, characterized in that: The capacitor module is connected to the measured power module, the discharge circuit includes a discharge template and a second contactor, and the capacitor module is connected to the discharge module through the second contactor.

4. The high voltage testing device for a power module according to claim 1, characterized in that: The measured power module driving circuit includes a switch, a signal generator, a UPS power supply, and an electro-optical conversion module, and the driving signal measurement circuit includes an oscilloscope; The signal control component is communicatively connected to the switch, the switch is connected to the control of the signal generator and the oscilloscope, the signal generator is connected to the electro-optical conversion module, and the drive signal output end of the electro-optical conversion module is connected to the drive signal input end of the power module under test.

5. The high voltage testing device for a power module according to claim 1, characterized in that: The high-voltage test instrument power supply circuit includes a high-voltage isolation transformer and a UPS power supply. The city power voltage supplies power to the UPS power supply through the high-voltage isolation transformer, and the UPS power supply supplies power to the high-voltage test instrument.

6. The high voltage testing device for a power module according to claim 3, characterized in that: The test operation component is connected to the first contactor via a boost input power-on control switch S1 , and the test operation component is connected to the second contactor via a capacitor module discharge control switch S2 .

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