Intelligent power module automatic test device and test method

Abstract

The invention discloses an intelligent power module automatic test device and method, and the device comprises an intelligent power module installation clamp, a test control box, and a control cable which is connected with the intelligent power module installation clamp and the test control box, the intelligent power module installation clamp is a printed circuit board, and is used for the plugging of a tested intelligent power module; the test control box is externally connected with a 28V control power supply and a 30V power supply, outputs a 15V driving power supply to the tested intelligent power module inserted on the intelligent power module mounting clamp and sends six paths of PWM switching signals, so as to excite the intelligent power module to perform switching action and detect a current acquisition signal at the same time; the control cable is used for connecting the tested intelligent power module installation clamp and the test control box. The intelligent power module testing device can overcome the limitation that an existing intelligent power module testing device is poor in portability and high in use and installation requirements.

Description

Technical Field

[0001] The invention relates to an intelligent power module automatic testing device and a testing method, belonging to the field of power module testing. Background Art

[0002] Intelligent power module (IPM) is an electronic device widely used in the field of electrical transmission and industrial control. Its function is to turn on and off the six internally integrated power switches (U phase up, U phase down, V phase up, V phase down, W phase up, W phase down) under the control of external control signals, thereby completing the conversion output of the DC bus power supply. It is the core component of the motor driver. The volume of the intelligent power module is larger than that of general electronic components. It is generally installed independently during the production process of the motor driver. After the intelligent power module is installed, if it is damaged, it is difficult to repair it. Therefore, before installing the intelligent power module, it is usually necessary to use a special test device to test it to ensure that the six internally integrated power switches can perform the switching action normally. After passing the test, it can be installed inside the motor driver. This reduces the repair rate during the production process of the motor driver and improves production efficiency and reliability.

[0003] A patent for an intelligent power module test device and test system (CN213457306U) uses a pneumatic actuator to press the module under test, and the device does not contain a test system inside, requires an external test system, and is not portable.

[0004] The patent for a portable power module test system and test method (CN103487678A) requires optical fiber connection between the test system and the power module installation tooling. Optical fiber is relatively fragile. The test system is expensive and has high operation complexity.

[0005] A patent for a portable power module test device (CN211348458U) uses a computer system plus a test board to generate a test signal and collects the test results through an acquisition board. The computer system is complex, bulky, costly and not portable.

[0006] The paper "Design of a Portable IGBT Power Module Automatic Tester" (Jiang Jing, Power Electronics Technology, January 2022) introduces a test device for power modules used in power grids. The device is specially developed for IGBT modules with optical fiber interfaces. It requires the use of an SCE board connected to the IGBT to test the IGBT module, and cannot test power modules with ordinary electrical interfaces. Summary of the invention

[0007] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide an intelligent power module automatic testing device and a testing method, to overcome the limitations of the prior intelligent power module testing device, such as poor portability and high requirements for use and installation.

[0008] The technical solution of the present invention is: in the first aspect, an intelligent power module automatic test device is provided, comprising: an intelligent power module installation fixture, a test control box, and a control cable connecting the intelligent power module installation fixture and the test control box, wherein:

[0009] The intelligent power module installation fixture is a printed circuit board used to plug in the intelligent power module under test;

[0010] The test control box is connected to an external 28V control power supply and a 30V power supply, outputs a 15V drive power supply to the intelligent power module under test plugged into the intelligent power module mounting fixture and sends 6-channel PWM switch signals to stimulate the intelligent power module to perform switching actions, and detect the current acquisition signal at the same time;

[0011] The control cable is used to connect the mounting fixture of the intelligent power module under test and the test control box.

[0012] Preferably, the control cable is a flat cable, and the control signal socket is a standard 2.54 pitch double-row socket.

[0013] Preferably, the intelligent power module installation fixture comprises: a control signal socket, a signal connection socket, and a power terminal contact device;

[0014] The power terminal contact device includes: a W terminal, a V terminal, a U terminal, a P terminal, and an N terminal, which are distributed at the edge of the printed circuit board and arranged in the same manner as the power terminals on the intelligent power module under test;

[0015] The signal connection socket is located on the printed circuit board and is used to plug in the control signal terminal of the intelligent power module under test;

[0016] The control signal socket is located on the edge of the printed circuit board and is connected to the control cable.

[0017] Preferably, each terminal in the contact device is a spring-type terminal. After the control signal terminal of the intelligent power module under test is fully plugged into the signal connection socket, the spring-type terminal automatically applies pressure to complete the reliable connection of the power terminal.

[0018] Preferably, the test control box includes: a main control circuit, a six-way PWM buffer circuit, a manual test button, a power resistor, a drive power supply, an internal control power supply, a current sensor, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, an indicator light, and a power plug. The connection method of the above structure is:

[0019] The internal control power supply is connected to the external 28V control power supply through the power plug to supply power to the main control circuit and the drive power supply; the main control circuit inputs the PWM signal to the control signal socket of the intelligent power module installation fixture through the six-way PWM buffer circuit; the drive power supply provides 15V drive power to the test intelligent power module through the control signal socket of the intelligent power module installation fixture;

[0020] The external 30V power supply is connected to the P terminal and the N terminal of the intelligent power module mounting fixture on one hand, and is connected to one end of the fourth relay and the fifth relay in parallel on the other hand. The other ends of the fourth relay and the fifth relay in parallel are connected to the power resistor, and are connected to one end of the first relay, the second relay, and the third relay in parallel after passing through the current sensor. The other ends of the first relay, the second relay, and the third relay are respectively connected to the W terminal, the V terminal, and the U terminal of the intelligent power module mounting fixture; the current sensor is also connected to the main control circuit to feed back the current signal to it;

[0021] The manual test button and indicator light are connected to the main control circuit.

[0022] In a second aspect, a method for installing an intelligent power module automatic test device is provided, comprising:

[0023] The intelligent power module under test is plugged into the intelligent power module mounting fixture, specifically, the control signal terminal on the intelligent power module is connected to the signal connection socket on the mounting fixture, and the power terminals of the intelligent power module under test are contacted and connected through the terminals in the power terminal contact device on the mounting fixture.

[0024] In a third aspect, a test method for an intelligent power module automatic test device is provided, comprising:

[0025] The tester connects the external control power supply and power supply to the test control box, and the driving power supply starts to provide 15V driving power to the intelligent power module under test. The main control circuit inside the test control box is powered on and works. The main control circuit is a single-chip microcomputer. When the tester presses the manual test button, the main control circuit controls the on and off of the first relay, the second relay, the third relay, the fourth relay, and the fifth relay respectively, and at the same time sends six PWM switching signals to the intelligent power module under test through the six-channel PWM buffer circuit. Under the action of the relay combination and the switch of the intelligent power module, a pulse current will flow through the power resistor. The main control circuit judges the working condition of the intelligent power module by collecting the current signal fed back by the current sensor. After the automatic test process ends, the main control circuit turns off all relays, stops sending PWM signals, and displays the test results through indicator lights.

[0026] Preferably, the six-way PWM buffer circuit sends six-way PWM switch signals to the intelligent power module under test, which respectively correspond to the six power switches of the intelligent power module under test, specifically: U-phase upper tube, U-phase lower tube, V-phase upper tube, V-phase lower tube, W-phase upper tube, and W-phase lower tube.

[0027] Preferably, the main control circuit determines the working condition of the intelligent power module by collecting the current signal fed back by the current sensor, specifically:

[0028] The main control circuit outputs only the PWM switch signal of the W-phase lower tube to the intelligent power module under test through the six-channel PWM buffer circuit, and the other channels output the shutdown signal; the main control circuit connects the first relay and the fifth relay, collects the signal of the circuit sensor, and if the current with the same cycle change as the PWM switch signal of the W-phase lower tube can be collected, and the current amplitude is normal, it is considered that the W-phase lower tube inside the intelligent power module works normally, and the detection of the W-phase lower tube is completed;

[0029] The main control circuit outputs only the PWM switch signal of the V-phase lower tube to the intelligent power module under test through the six-channel PWM buffer circuit, and the other channels output the shutdown signal. Disconnect the first relay, connect the second relay, and collect the signal of the circuit sensor. If the current that changes with the same cycle as the PWM switch signal of the V-phase lower tube can be collected, and the current amplitude is normal, it is considered that the V-phase lower tube inside the intelligent power module is working normally, and the detection of the V-phase lower tube is completed;

[0030] The main control circuit outputs only the PWM switch signal of the U-phase lower tube to the intelligent power module under test through the six-channel PWM buffer circuit, and the other channels output the shutdown signal. Disconnect the second relay, connect the third relay, and collect the signal of the circuit sensor. If the current that changes with the same cycle as the PWM switch signal of the U-phase lower tube can be collected, and the current amplitude is normal, it is considered that the U-phase lower tube inside the intelligent power module is working normally, and the detection of the U-phase lower tube is completed;

[0031] All relays are disconnected, and the main control circuit outputs only the PWM switch signal of the W-phase upper tube to the intelligent power module under test through the six-way PWM buffer circuit. The first relay and the fourth relay are closed, and the signal of the circuit sensor is collected. If the current that changes with the same cycle as the PWM switch signal of the W-phase upper tube can be collected, and the current amplitude is normal, it is considered that the W-phase upper tube inside the intelligent power module is working normally, and the detection of the W-phase upper tube is completed;

[0032] The main control circuit outputs only the PWM switch signal of the V-phase upper tube to the intelligent power module under test through the six-way PWM buffer circuit, disconnects the first relay, closes the second relay, and collects the signal of the circuit sensor. If the current that changes with the same cycle as the PWM switch signal of the V-phase upper tube can be collected and the current amplitude is normal, it is considered that the V-phase upper tube inside the intelligent power module is working normally, and the detection of the V-phase upper tube is completed;

[0033] The main control circuit outputs only the PWM switch signal of the U-phase upper tube to the intelligent power module under test through the six-way PWM buffer circuit, disconnects the second relay, closes the third relay, and collects the signal of the circuit sensor. If the current that changes with the same cycle as the PWM switch signal of the U-phase upper tube can be collected and the current amplitude is normal, it is considered that the U-phase upper tube inside the intelligent power module is working normally, and the detection of the U-phase upper tube is completed;

[0034] After execution is completed, the indicator light will display the pass or fail result.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] (1) The present invention adopts a single-chip microcomputer control circuit, integrates the control signal generating circuit and module output signal detection circuit of the intelligent power module, and adopts a current sensor as a detection device. The test control box is small and easy to carry and has a high degree of automation. The tester only needs to press the test button to automatically complete the generation of the test signal and the judgment of the test output without connecting to an external test system.

[0037] (2) The test system (test control box) of the present invention and the intelligent power module installation fixture are connected by industrial flat cables. The connection method is simple, reliable, easy to operate, low cost, does not require external tools, and has low requirements for operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A top view of the composition diagram of the intelligent power module automatic testing device of the present invention;

[0039] Figure 2 It is a side view of the composition diagram of the intelligent power module automatic testing device of the present invention;

[0040] Figure 3 This is a schematic diagram of the automatic testing device for intelligent power modules of the present invention. DETAILED DESCRIPTION

[0041] The present invention is based on a single-chip microcomputer as a control core, and controls the operation of an intelligent power module by sending control signals and test pulses through the single-chip microcomputer, and connects the power load resistor to the six switch tubes inside the intelligent power module respectively, and finally determines whether the function of the intelligent power module is normal by collecting the current flowing through the load resistor. The specific technical scheme of the present invention is described below in conjunction with the accompanying drawings.

[0042] like Figure 1As shown in FIG. 1 , the composition diagram of the intelligent power module automatic test device is shown. The present invention mainly comprises two parts, an intelligent power module installation fixture 1 and a test control box 4. The intelligent power module installation fixture 1 is a printed circuit board on which a signal connection socket 3 (corresponding to Figure 3 signal connection socket 116 in the intelligent power module power terminal contact device 8, control signal socket 2 (corresponding to Figure 3 The intelligent power module installation fixture 1 is connected to the test control box 4 through the control cable 5. The control cable 5 is a flat cable. The control signal socket is a standard 2.54 pitch double-row socket. The test control box 4 is connected to the test control box 4 through the power connector 6 (corresponding to Figure 3 The power plug 114 in the test panel 7 is used to obtain the control power supply and the power circuit power supply of the intelligent power module. The test personnel can control the test process and obtain the test results by operating the test panel 7.

[0043] The test control box 4 includes: a power connector 6 (corresponding to Figure 3 The power plug 114) and the test panel 7, the connection method of the above structure is that the tester connects the 28V DC power supply and the 30V power supply to the power plug 6, and operates the test panel 7 to start automatic testing; the test panel 7 includes a manual test button 103 and an indicator light 113.

[0044] The control cable 5 is a flat cable, and the control signal socket 2 is a standard 2.54 pitch double-row socket;

[0045] The intelligent power module mounting fixture 1 includes: a control signal socket 115, a signal connection socket 116, and an intelligent power module power terminal contact device 8; the connection method of the above structure is to plug the intelligent power module 9 under test into the intelligent power module mounting fixture 1, specifically, the control signal terminal on the intelligent power module is connected to the signal connection socket 3 on the mounting fixture to achieve the fastening of the power module under test; the power terminal of the power module under test is contacted and connected through the power terminal contact device 8 on the mounting fixture, and since the contact device 8 is a spring-type terminal, after the intelligent power module under test is fully plugged into the signal connection socket 3, the spring-type terminal will automatically be pressed, thereby completing the reliable connection of the power terminal.

[0046] The test control box 4 mainly includes a main control circuit 101, a 6-way PWM buffer circuit 102, a manual test button 103, a power resistor 104, a drive power supply 105, a control power supply 106, a current sensor 107, a first relay 108, a second relay 109, a third relay 110, a fourth relay 111, a fifth relay 112, an indicator light 113, and a power plug 114. The connection method of the above structure is:

[0047] The internal control power supply 106 is connected to the external 28V control power supply to supply power to the main control circuit 101 and the drive power supply 105; the main control circuit 101 inputs the PWM signal to the control signal socket of the intelligent power module installation fixture 1 through the six-way PWM buffer circuit 102; the drive power supply 105 provides 15V drive power to the test intelligent power module through the control signal socket of the intelligent power module installation fixture 1;

[0048] The external 30V power supply is connected to the P terminal and the N terminal of the intelligent power module mounting fixture 1 on one hand, and is connected to one end of the fourth relay 111 and the fifth relay 112 in parallel on the other hand. The other ends of the fourth relay 111 and the fifth relay 112 in parallel are connected to the power resistor 104, and are connected to one end of the first relay 108, the second relay 109, and the third relay 110 in parallel after passing through the current sensor 107. The other ends of the first relay 108, the second relay 109, and the third relay 110 are respectively connected to the W terminal, the V terminal, and the U terminal of the intelligent power module mounting fixture 1; the current sensor 107 is also connected to the main control circuit 101 to feed back the current signal thereto;

[0049] The manual test button 103 and the indicator light 113 are connected to the main control circuit 101 .

[0050] The 15V power supply generated by the driving power supply 105, the PWM signal generated by the buffer circuit 102, the current signal collected by the current sensor 107, the external power supply signal and the UVW terminal signal of the intelligent power module are all transmitted through the attached Figure 1 The control cable 5 is used for transmission.

[0051] The installation method is as follows: When using Figure 2 As shown, the intelligent power module 9 to be tested needs to be plugged into the intelligent power module mounting fixture 1, specifically, the control signal terminal on the intelligent power module is connected to the signal connection socket 116 on the mounting fixture, and the power terminal of the power module to be tested is contacted and connected through the power terminal contact device 8 on the mounting fixture. The tester connects the control power supply and the power supply to the power plug 6, and operates the test panel 7 to start the automatic test. After the test is qualified, the test result can be obtained by observing the indicator light on the test panel 7.

[0052] The test method is as follows: The tester connects the external control power supply and power supply to the test control box, and the drive power supply starts to provide 15V drive power to the intelligent power module under test. Figure 3The main control circuit 101 inside the test control box is powered on and working. The main control circuit is a single-chip microcomputer. When the tester presses the manual test button 103, the main control circuit starts to control the combination of 5 relays 108-112 respectively. At the same time, 6 PWM switch signals are sent to the intelligent power module under test through the buffer circuit 102. Under the action of the relay combination and the switch of the intelligent power module, a pulse current will flow through the power resistor 104. The main control circuit 101 judges the working condition of the intelligent power module by collecting the current signal fed back by the current sensor 107. After the automatic test process is completed, the main control circuit turns off all relays, stops sending PWM signals, and displays the test results through the indicator light 113.

[0053] a. The main control circuit only outputs the PWM of the W-phase lower tube, and the other channels output the shutdown signal. Turn on relays 108 and 112, and collect the signal of circuit sensor 107. If the current that changes with the same cycle as PWM can be collected, and the current amplitude is normal (excluding the problem of short circuit of the switch tube), it is considered that the W-phase lower tube inside the intelligent power module is working normally;

[0054] b. The main control circuit only outputs the PWM of the V phase lower tube, and the other channels output the shutdown signal. Disconnect the relay 108, connect the relay 109, and repeat the above steps to complete the detection of the V phase lower tube;

[0055] c. The main control circuit only outputs the PWM of the U-phase lower tube, and the other channels output the shutdown signal. Disconnect the relay 109, connect the relay 110, and repeat the above steps to complete the detection of the U-phase lower tube;

[0056] d. Disconnect all relays, the main control circuit only outputs the PWM of the W-phase upper tube, close relay 108 and relay 111, repeat the above steps, and complete the detection of the W-phase upper tube;

[0057] e. The main control circuit only outputs the PWM of the upper tube of the V phase, disconnects the relay 108, closes the relay 109, and repeats the above steps to complete the detection of the upper tube of the V phase;

[0058] f. The main control circuit only outputs the PWM of the U-phase upper tube, disconnects the relay 109, closes the relay 110, and repeats the above steps to complete the detection of the U-phase upper tube.

[0059] After the execution is completed, the indicator light 113 displays the result of the pass or fail judgment.

[0060] Through the above test process, the present invention can realize the automatic test of the intelligent power module.

[0061] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in this field.

Claims

1. An automatic test device for intelligent power module, characterized in that include: An intelligent power module mounting fixture (1), a test control box (4), and a control cable (5) connecting the intelligent power module mounting fixture (1) and the test control box (4), wherein: The intelligent power module installation fixture (1) is a printed circuit board, which is used for plugging the intelligent power module to be tested; The test control box (4) is externally connected to a 28V control power supply and a 30V power supply, outputs a 15V driving power supply to the intelligent power module under test plugged into the intelligent power module mounting fixture (1) and sends six PWM switch signals to stimulate the intelligent power module to perform switching actions, and detects the current acquisition signal at the same time; The control cable (5) is used to connect the intelligent power module installation fixture (1) to be tested and the test control box (4).

2. The intelligent power module automatic testing device according to claim 1, characterized in that: The control cable (5) is a flat cable, and the control signal socket is a standard 2.54 pitch double-row socket.

3. The intelligent power module automatic testing device according to claim 1, characterized in that: The intelligent power module installation fixture (1) comprises: a control signal socket (115), a signal connection socket (116), and a power terminal contact device (8); The power terminal contact device (8) comprises: a W terminal, a V terminal, a U terminal, a P terminal, and an N terminal, which are distributed at the edge of the printed circuit board and arranged in the same manner as the power terminals on the intelligent power module to be tested; The signal connection socket (116) is located on the printed circuit board and is used for plugging into the control signal terminal of the intelligent power module under test; The control signal socket (115) is located at the edge of the printed circuit board and is connected to the control cable (5).

4. The automatic testing device for intelligent power module according to claim 1, characterized in that: Each terminal in the contact device (8) is a spring-type terminal. After the control signal terminal of the intelligent power module under test is fully plugged into the signal connection socket, the spring-type terminal automatically applies pressure, thereby completing a reliable connection of the power terminal.

5. The intelligent power module automatic testing device according to claim 3, characterized in that: The test control box (4) comprises: a main control circuit (101), a six-way PWM buffer circuit (102), a manual test button (103), a power resistor (104), a drive power supply (105), an internal control power supply (106), a current sensor (107), a first relay (108), a second relay (109), a third relay (110), a fourth relay (111), a fifth relay (112), an indicator light (113), and a power plug (114). The connection method of the above structure is as follows: The internal control power supply (106) is connected to an external 28V control power supply via a power plug (114) to supply power to the main control circuit (101) and the drive power supply (105); the main control circuit (101) inputs a PWM signal to a control signal socket of the intelligent power module installation fixture (1) via a six-channel PWM buffer circuit (102); the drive power supply (105) provides a 15V drive power supply to the test intelligent power module via the control signal socket of the intelligent power module installation fixture (1); An external 30V power source is connected to the P terminal and the N terminal of the intelligent power module mounting fixture (1) on one hand, and is connected to one end of a fourth relay (111) and a fifth relay (112) connected in parallel on the other hand; the other ends of the fourth relay (111) and the fifth relay (112) connected in parallel are connected to a power resistor (104), and are connected to one end of a first relay (108), a second relay (109), and a third relay (110) connected in parallel after passing through a current sensor (107); the other ends of the first relay (108), the second relay (109), and the third relay (110) are respectively connected to the W terminal, the V terminal, and the U terminal of the intelligent power module mounting fixture (1); the current sensor (107) is simultaneously connected to the main control circuit (101) to feed back a current signal thereto; The manual test button (103) and the indicator light (113) are connected to the main control circuit (101).

6. A method for installing an automatic test device for an intelligent power module, characterized in that include: The intelligent power module to be tested is plugged into the intelligent power module mounting fixture, specifically, the control signal terminal on the intelligent power module is connected to the signal connection socket (116) on the mounting fixture, and the power terminals of the intelligent power module to be tested are contacted and connected through the terminals in the power terminal contact device (8) on the mounting fixture (1).

7. A testing method for an intelligent power module automatic testing device, characterized in that include: The tester connects the external control power supply and the power supply to the test control box (4), and the driving power supply (105) starts to provide 15V driving power to the intelligent power module under test. The main control circuit (101) inside the test control box is powered on and starts working. The main control circuit is a single chip microcomputer. When the tester presses the manual test button (103), the main control circuit controls the on and off of the first relay (108), the second relay (109), the third relay (110), the fourth relay (111), and the fifth relay (112) respectively, and simultaneously sends six PWM switch signals to the intelligent power module under test through the six PWM buffer circuit (102). Under the action of the relay combination and the switch of the intelligent power module, a pulse current flows through the power resistor (104). The main control circuit (101) judges the working condition of the intelligent power module by collecting the current signal fed back by the current sensor (107). After the automatic test process is completed, the main control circuit (101) turns off all relays, stops sending PWM signals, and displays the test result through the indicator light (113).

8. The testing method of the intelligent power module automatic testing device according to claim 7, characterized in that: The six-way PWM buffer circuit (102) sends six-way PWM switch signals to the intelligent power module under test, which respectively correspond to six power switches of the intelligent power module under test, specifically: U-phase upper tube, U-phase lower tube, V-phase upper tube, V-phase lower tube, W-phase upper tube, and W-phase lower tube.

9. The testing method of the intelligent power module automatic testing device according to claim 8, characterized in that: The main control circuit (101) determines the working condition of the intelligent power module by collecting the current signal fed back by the current sensor (107), specifically: The main control circuit (101) outputs only the PWM switch signal of the W-phase lower tube to the intelligent power module under test through the six-channel PWM buffer circuit (102), and the other channels output shutdown signals; the main control circuit (101) connects the first relay (108) and the fifth relay (112), collects the signal of the circuit sensor (107), and if a current that changes with the same cycle as the PWM switch signal of the W-phase lower tube can be collected and the current amplitude is normal, it is considered that the W-phase lower tube inside the intelligent power module is working normally, and the detection of the W-phase lower tube is completed; The main control circuit (101) outputs only the PWM switch signal of the V-phase lower tube to the intelligent power module under test through the six-channel PWM buffer circuit (102), and outputs the closing signal of the other channels, disconnects the first relay (108), connects the second relay (109), and collects the signal of the circuit sensor (107). If the current that changes with the same cycle as the PWM switch signal of the V-phase lower tube can be collected and the current amplitude is normal, it is considered that the V-phase lower tube inside the intelligent power module is working normally, and the detection of the V-phase lower tube is completed; The main control circuit (101) outputs only the PWM switch signal of the U-phase lower tube to the intelligent power module under test through the six-channel PWM buffer circuit (102), and outputs the closing signal of the other channels, disconnects the second relay (109), connects the third relay (110), and collects the signal of the circuit sensor (107). If a current that changes with the same cycle as the PWM switch signal of the U-phase lower tube can be collected and the current amplitude is normal, it is considered that the U-phase lower tube inside the intelligent power module is working normally, and the detection of the U-phase lower tube is completed; All relays are disconnected, and the main control circuit (101) outputs only the PWM switch signal of the W-phase upper tube to the intelligent power module under test through the six-way PWM buffer circuit (102), and the first relay (108) and the fourth relay (111) are closed, and the signal of the circuit sensor (107) is collected. If a current that changes in the same cycle as the PWM switch signal of the W-phase upper tube can be collected, and the current amplitude is normal, it is considered that the W-phase upper tube inside the intelligent power module is working normally, and the detection of the W-phase upper tube is completed; The main control circuit (101) outputs only the PWM switch signal of the V-phase upper tube to the intelligent power module under test through the six-channel PWM buffer circuit (102), disconnects the first relay (108), closes the second relay (109), and collects the signal of the circuit sensor (107). If a current that changes with the same cycle as the PWM switch signal of the V-phase upper tube can be collected and the current amplitude is normal, it is considered that the V-phase upper tube inside the intelligent power module is working normally, and the detection of the V-phase upper tube is completed; The main control circuit (101) outputs only the PWM switch signal of the U-phase upper tube to the intelligent power module under test through the six-channel PWM buffer circuit (102), disconnects the second relay (109), closes the third relay (110), and collects the signal of the circuit sensor (107); if a current that changes in the same cycle as the PWM switch signal of the U-phase upper tube can be collected and the current amplitude is normal, it is considered that the U-phase upper tube inside the intelligent power module is working normally, and the detection of the U-phase upper tube is completed; After the execution is completed, the result of the determination of whether it is qualified or not is displayed through the indicator light (113).

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