A power module VBS operating current test circuit and test method

Abstract

The present invention provides a power module VBS operating current test circuit and test method, comprising: a power supply, a control chip, a first upper bridge arm, a second upper bridge arm, a third upper bridge arm, a first lower bridge arm, a second lower bridge arm, a third lower bridge arm, a signal generator, a first relay, a second relay, a third relay, and multiple control power supplies; the input end of the first relay is used to input the U-phase operating current, and the output end of the first relay is connected to the source of the first upper bridge arm; the input end of the second relay is used to input the V-phase operating current, and the output end of the second relay is connected to the source of the second upper bridge arm; the input end of the third relay is used to input the W-phase operating current, and the output end of the third relay is connected to the source of the third upper bridge arm; the operating current test function is achieved by controlling the first relay, the second relay, and the third relay. The present invention has high test accuracy and good test reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of power modules, and in particular to a power module VBS operating current test circuit and test method. Background Art

[0002] Intelligent Power Modules (IPMs) are power drive products that combine power electronics and integrated circuit technologies. They combine the advantages of high current, low saturation voltage, and high withstand voltage of GTRs (high-power transistors) with the high input impedance, high switching frequency, and low drive power of MOSFETs (field-effect transistors). During the production process of power modules, some defective products are inevitable. Parametric testing can effectively screen out substandard products that do not meet specifications, preventing them from entering the market and thus improving overall product quality. Regular parametric testing of high-voltage integrated circuits can monitor quality changes during the production process, promptly identify problems, and take corrective measures. This helps ensure stable and consistent product quality. Parametric testing is an indispensable step in the R&D of high-voltage integrated circuits.

[0003] With the rapid development of power electronics, the development trend of power devices is intelligentization and integration. Power modules integrate high-voltage ICs, power chips and other devices. We test a large number of product parameters. For example, among the more than 500 parameters of a module, 70% are IC parameters, and the remaining 30% are also related to ICs. VBS is the core parameter of the IC in the module. It is a necessary test item during the product development stage and the factory production process.

[0004] However, current VBS high-side operating current testing may have the following issues: insufficient detection accuracy, which may result in significant deviations between the measured current and the actual value. Factors such as ambient electromagnetic interference and temperature fluctuations may affect the accuracy of the measurement results. For example, strong electromagnetic fields may cause errors in the measuring instrument. Dynamic current measurement is difficult: In actual operation, the VBS high-side current may change dynamically, and traditional measurement methods may have difficulty accurately capturing these dynamic current changes, resulting in low test accuracy and poor reliability. Summary of the Invention

[0005] The present invention provides a power module VBS operating current test circuit, aiming to solve the problems of low current test accuracy and poor test reliability of existing intelligent power modules.

[0006] In a first aspect, an embodiment of the present invention provides a power module VBS operating current test circuit, comprising: a power supply, a control chip, a first upper bridge arm, a second upper bridge arm, a third upper bridge arm, a first lower bridge arm, a second lower bridge arm, a third lower bridge arm, a signal generator, a first relay, a second relay, a third relay, and a plurality of control power supplies;

[0007] The power supply is used to power the control chip; the input end INUH of the first upper bridge arm, the input end INVH of the second upper bridge arm, and the input end INWH of the third upper bridge arm are respectively connected to the signal generator and used as control ends of high and low level PWM pulses;

[0008] The source of the first upper bridge arm is connected to the drain of the first lower bridge arm, the source of the second upper bridge arm is connected to the drain of the second lower bridge arm, and the source of the third upper bridge arm is connected to the drain of the third lower bridge arm; the gate of the first upper bridge arm, the gate of the second upper bridge arm, the gate of the third upper bridge arm, the gate of the first lower bridge arm, the gate of the second lower bridge arm, and the gate of the third lower bridge arm are respectively connected to the control chip; the drain of the first upper bridge arm is respectively connected to the drain of the second upper bridge arm and the drain of the third upper bridge arm and are commonly connected to the bus voltage input terminal P; the source of the first lower bridge arm is used to connect to the module external pin NU, the source of the second lower bridge arm is used to connect to the module external pin NV, and the source of the third lower bridge arm is used to connect to the module external pin NW;

[0009] The U-phase bootstrap terminal VB1 of the control chip is connected to the positive electrode of the control power supply, the V-phase bootstrap terminal VB2 of the control chip is connected to the positive electrode of the control power supply, the W-phase bootstrap terminal VB3 of the control chip is connected to the positive electrode of the control power supply, and the negative electrode of the control power supply is grounded;

[0010] The input end of the first relay is used to input the U-phase working current, and the output end of the first relay is connected to the source of the first upper bridge arm; the input end of the second relay is used to input the V-phase working current, and the output end of the second relay is connected to the source of the second upper bridge arm; the input end of the third relay is used to input the W-phase working current, and the output end of the third relay is connected to the source of the third upper bridge arm; the working current test function is realized by controlling the first relay, the second relay and the third relay.

[0011] Preferably, the power module VBS working current test circuit also includes a first capacitor, the two ends of which are respectively connected to the power supply and the COM port of the control chip for filtering out high-frequency signals; the COM port of the control chip is also grounded.

[0012] Preferably, the power module VBS operating current test circuit further includes a second capacitor, and two ends of the second capacitor are respectively connected to the COM port of the control chip and the RS port of the control chip.

[0013] Preferably, the power module VBS operating current test circuit further includes a first resistor, one end of the first resistor is connected to the EN port of the control chip, and the other end of the first resistor is used to connect to a fixed power supply.

[0014] In a second aspect, an embodiment of the present invention provides a method for testing a VBS operating current of a power module. The method is implemented based on the power module VBS operating current test circuit described above, and the method includes the following steps:

[0015] S1. Place the sample to be tested on the test fixture and fix the sample to be tested;

[0016] S2. Connect the first relay, second relay, and third relay to the test sample without power supply, so that the circuit remains open.

[0017] S3. Apply necessary fixed power supply conditions to the functional pins of the power module, wherein the fixed power supply conditions are VCC = 15V, EN = 5V, VFAULT = 5V, INVL, INUL, and INWL = 0V;

[0018] S4. Test the static working current of VB: Use the signal generator to control the high and low levels of INUH, INVH and INWH from 0 to 5V, and measure the static working current of VBS when the phase is at high or low level;

[0019] S5. Test the dynamic working current of VB: input a square wave of 20K or more to INUH, INVH and INWH through the signal generator, and measure the dynamic working current of VBS when the phase is turned on or off;

[0020] S6: After the test is completed, the first relay, the second relay and the third relay are disconnected;

[0021] S7. Finally, disconnect all power supplies.

[0022] Preferably, the S4 specifically includes the following steps:

[0023] Use a signal generator to control the high and low levels of INUH, INVH, and INWH to 0-5V, test the working current of the VBU phase, turn on the power to the VBU, and then disconnect the second relay and the third relay. At this time, the value measured by the current detector is the VBS working static current.

[0024] Preferably, the S5 specifically includes the following steps:

[0025] Use a signal generator to input a square wave of 20K or more to INUH, INVH, and INWH to test the operating current of the VBU phase. Turn on the power to the VBU, and then disconnect the second relay and the third relay. At this time, the value measured by the current detector is the VBS operating dynamic current.

[0026] Compared with the prior art, the beneficial effect of the present invention lies in that the power supply is used to power the control chip; the input terminal INUH of the first upper bridge arm, the input terminal INVH of the second upper bridge arm and the input terminal INWH of the third upper bridge arm are respectively connected to the signal generator, which are used as control terminals of high and low level PWM pulses; the source of the first upper bridge arm is connected to the drain of the first lower bridge arm, the source of the second upper bridge arm is connected to the drain of the second lower bridge arm, and the source of the third upper bridge arm is connected to the drain of the third lower bridge arm; the gate of the first upper bridge arm, the gate of the second upper bridge arm, the gate of the third upper bridge arm, the gate of the first lower bridge arm, the gate of the second lower bridge arm and the gate of the third lower bridge arm are respectively connected to the control chip; the drain of the first upper bridge arm is respectively connected to the drain of the second upper bridge arm and the drain of the third upper bridge arm and are jointly connected to the bus voltage input terminal P; the source of the first lower bridge arm is used to connect the module The source of the second lower bridge arm is connected to the module's external pin NU, and the source of the third lower bridge arm is connected to the module's external pin NW. The U-phase bootstrap terminal VB1 of the control chip is connected to the positive terminal of the control power supply, the V-phase bootstrap terminal VB2 of the control chip is connected to the positive terminal of the control power supply, and the W-phase bootstrap terminal VB3 of the control chip is connected to the positive terminal of the control power supply. The negative terminal of the control power supply is grounded. The input of the first relay is used to input the U-phase operating current, and the output of the first relay is connected to the source of the first upper bridge arm. The input of the second relay is used to input the V-phase operating current, and the output of the second relay is connected to the source of the second upper bridge arm. The input of the third relay is used to input the W-phase operating current, and the output of the third relay is connected to the source of the third upper bridge arm. The operating current test function is achieved by controlling the first, second, and third relays. This effectively optimizes the testing of the power module's operating current, improves test accuracy, and ensures product test reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be described in detail below with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made with reference to the following drawings. In the accompanying drawings:

[0028] Figure 1 1 is a circuit diagram of a power module VBS operating current test circuit provided by an embodiment of the present invention;

[0029] Figure 2This is a circuit diagram of an anti-backfeed protection circuit provided by an embodiment of the present invention.

[0030] In the figure, 1. control chip, 2. first upper bridge arm, 3. second upper bridge arm, 4. third upper bridge arm, 5. first lower bridge arm, 6. second lower bridge arm, 7. third lower bridge arm, 8. control power supply, 9. signal generator. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Example 1

[0033] Combined with attachment Figure 1 As shown, an embodiment of the present invention provides a power module VBS working current test circuit, including: a power supply VCC, a control chip 1, a first upper bridge arm 2, a second upper bridge arm 3, a third upper bridge arm 4, a first lower bridge arm 5, a second lower bridge arm 6, a third lower bridge arm 7, a signal generator 9, a first relay K1, a second relay K2, a third relay K3 and multiple control power supplies 8.

[0034] Among them, the first upper bridge arm 2 , the second upper bridge arm 3 , the third upper bridge arm 4 , the first lower bridge arm 5 , the second lower bridge arm 6 , and the third lower bridge arm 7 are all triode transistors.

[0035] The power supply VCC is used to power the control chip 1; the input end INUH of the first upper bridge arm 2, the input end INVH of the second upper bridge arm 3 and the input end INWH of the third upper bridge arm 4 are respectively connected to the signal generator 9, which are used as control ends of high and low level PWM pulses.

[0036] The source of the first upper bridge arm 2 is connected to the drain of the first lower bridge arm 5, the source of the second upper bridge arm 3 is connected to the drain of the second lower bridge arm 6, and the source of the third upper bridge arm 4 is connected to the drain of the third lower bridge arm 7; the gate of the first upper bridge arm 2, the gate of the second upper bridge arm 3, the gate of the third upper bridge arm 4, the gate of the first lower bridge arm 5, the gate of the second lower bridge arm 6 and the gate of the third lower bridge arm 7 are respectively connected to the control chip 1; the drain of the first upper bridge arm 2 is respectively connected to the drain of the second upper bridge arm 3 and the drain of the third upper bridge arm 4 and are commonly connected to the bus voltage input terminal P; the source of the first lower bridge arm 5 is used to connect to the module external pin NU end, the source of the second lower bridge arm 6 is used to connect to the module external pin NV end, and the source of the third lower bridge arm 7 is used to connect to the module external pin NW end.

[0037] Specifically, the control power supply 8 includes three terminals, which are respectively connected to the U-phase, V-phase, and W-phase bootstrap terminals VB (1 / 2 / 3) of the control chip 1. The U-phase bootstrap terminal VB1 of the control chip 1 is individually connected to the positive electrode of the corresponding control power supply 8, the V-phase bootstrap terminal VB2 of the control chip 1 is individually connected to the positive electrode of the corresponding control power supply 8, and the W-phase bootstrap terminal VB3 of the control chip 1 is individually connected to the positive electrode of the corresponding control power supply 8. The negative electrodes of the three control power supplies 8 are all grounded.

[0038] The input end of the first relay K1 is used to input the U-phase working current, and the output end of the first relay K1 is connected to the source of the first upper bridge arm 2; the input end of the second relay K2 is used to input the V-phase working current, and the output end of the second relay K2 is connected to the source of the second upper bridge arm 3; the input end of the third relay K3 is used to input the W-phase working current, and the output end of the third relay K3 is connected to the source of the third upper bridge arm 4; the working current test function is realized by controlling the first relay K1, the second relay K2 and the third relay K3.

[0039] Among them, the module bus voltage input terminal P is suspended; the upper bridge arm signal input terminals INUH, INVH, and INWH of the power module are connected to the signal generator 9 as high and low level PWM pulse control terminals; the temperature simulation signal output terminal RTH is suspended; the IC power supply VCC output terminal VCC is connected to 15V; the lower bridge arm signal input terminals INVL, INUL, and INWL of the power module are suspended; the power module enable input / output terminals EN and VFAULT are connected to 5V; the U phase output terminal of the power module is grounded; the V The phase output terminal is grounded; the W-phase output terminal of the power module is grounded; the U-phase bootstrap terminal VBU of the power module is separately connected to the first control power supply 8, and is connected to the positive electrode of the control power supply 8, and the negative electrode of the control power supply 8 is connected to the common ground; the V-phase bootstrap terminal VBV of the power module is separately connected to the second control power supply 8, and is connected to the positive electrode of the control power supply 8, and the negative electrode of the control power supply 8 is connected to the common ground; the W-phase bootstrap terminal VBW of the power module is separately connected to the third control power supply 8, and is connected to the positive electrode of the control power supply 8, and the negative electrode of the control power supply 8 is connected to the common ground;

[0040] Specifically, the power supply VCC is used to power the control chip 1; the input terminal INUH of the first upper bridge arm 2, the input terminal INVH of the second upper bridge arm 3 and the input terminal INWH of the third upper bridge arm 4 are respectively connected to the signal generator 9, which are used as control terminals of high and low level PWM pulses; the source of the first upper bridge arm 2 is connected to the drain of the first lower bridge arm 5, the source of the second upper bridge arm 3 is connected to the drain of the second lower bridge arm 6, and the source of the third upper bridge arm 4 is connected to the drain of the third lower bridge arm 7; the gate of the first upper bridge arm 2, the gate of the second upper bridge arm 3, the gate of the third upper bridge arm 4, the gate of the first lower bridge arm 5, the gate of the second lower bridge arm 6 and the gate of the third lower bridge arm 7 are respectively connected to the control chip 1; the drain of the first upper bridge arm 2 is respectively connected to the drain of the second upper bridge arm 3 and the drain of the third upper bridge arm 4 and are jointly connected to the bus voltage input terminal P; the source of the first lower bridge arm 5 is used to connect to the module external pin NU end, the second lower bridge arm The source of arm 6 is connected to the module's external pin NV, and the source of the third lower bridge arm 7 is connected to the module's external pin NW. The U-phase bootstrap terminal VB1 of control chip 1 is connected separately to the positive terminal of control power supply 8, the V-phase bootstrap terminal VB2 of control chip 1 is connected separately to the positive terminal of control power supply 8, and the W-phase bootstrap terminal VB3 of control chip 1 is connected separately to the positive terminal of control power supply 8. The negative terminal of control power supply 8 is grounded. The input of the first relay K1 is used to input the U-phase operating current, and the output of the first relay K1 is connected to the source of the first upper bridge arm 2. The input of the second relay K2 is used to input the V-phase operating current, and the output of the second relay K2 is connected to the source of the second upper bridge arm 3. The input of the third relay K3 is used to input the W-phase operating current, and the output of the third relay K3 is connected to the source of the third upper bridge arm 4. The operating current test function is achieved by controlling the first relay K1, the second relay K2, and the third relay K3. This effectively optimizes the operating current test of the power module, improves test accuracy, and ensures product test reliability.

[0041] In this embodiment, the power module VBS operating current test circuit also includes a first capacitor C1. The first capacitor C1's terminals are connected to the power supply VCC and the COM port of the control chip 1, respectively, to filter out high-frequency signals. The COM port of the control chip 1 is also grounded. First capacitor C1 serves as a high-frequency filter capacitor for the control chip 1. It is connected to VCC and COM, positioned as close as possible to the output terminal of the control chip 1, to filter out high-frequency signals.

[0042] In this embodiment, the power module VBS operating current test circuit further includes a second capacitor C2 , and two ends of the second capacitor C2 are respectively connected to the COM port of the control chip 1 and the RS port of the control chip 1 .

[0043] In this embodiment, the power module VBS working current test circuit also includes a first resistor R1, one end of the first resistor R1 is connected to the EN port of the control chip 1, and the other end of the first resistor R1 is used to connect to a fixed power supply to facilitate circuit protection effect.

[0044] Example 2

[0045] like Figure 2 As shown, an embodiment of the present invention provides a method for testing the VBS operating current of a power module. The testing method is implemented based on the power module VBS operating current testing circuit of the first embodiment. The testing method includes the following steps:

[0046] S1. Place the sample to be tested on the test fixture and fix the sample to be tested;

[0047] S2. Connect the first relay K1, the second relay K2, and the third relay K3 to the test sample without power supply, so that the circuit remains open.

[0048] S3. Apply necessary fixed power supply conditions to the functional pins of the power module, wherein the fixed power supply conditions are VCC = 15V, EN = 5V, VFAULT = 5V, INVL, INUL, and INWL = 0V;

[0049] S4. Test the static working current of VB: Use the signal generator 9 to control the high and low levels of INUH, INVH, and INWH from 0 to 5V, and measure the static working current of VBS when the phase is at a high or low level;

[0050] S5. Test the dynamic working current of VB: input a square wave of 20K or more to INUH, INVH and INWH through the signal generator 9, and measure the dynamic working current of VBS when the phase is turned on or off;

[0051] S6: After the test is completed, the first relay K1, the second relay K2 and the third relay K3 are disconnected;

[0052] S7. Finally, disconnect all power supplies.

[0053] In this embodiment, step S4 specifically includes the following steps:

[0054] The signal generator 9 is used to control the high and low levels of INUH, INVH, and INWH to 0-5V, and the working current of the VBU phase is tested. The power supply of the VBU is turned on, and then the second relay K2 and the third relay K3 are disconnected. At this time, the value measured by the current detector is the VBS working static current.

[0055] In this embodiment, step S5 specifically includes the following steps:

[0056] Input a square wave of 20K or more to INUH, INVH, and INWH through the signal generator 9 to test the working current of the VBU phase. Turn on the power to the VBU, and then disconnect the second relay K2 and the third relay K3. At this time, the value measured by the current detector is the VBS working dynamic current.

[0057] During implementation, the sample under test is placed on the test fixture and secured. Without power, the test sample is connected to the first relay K1, the second relay K2, and the third relay K3. The necessary fixed power supply conditions, VCC = 15V, EN = 5V, VFAULT = 5V, and INVL, INUL, and INWL = 0V, are applied. A signal generator is used to control the high and low levels of INUH, INVH, and INWH to 0 and 5V. For example, to test the operating current of the VBU phase, power is turned on for the VBU, then the second relay K2 and the third relay K3 are disconnected. The current detector then measures the VBS operating static current. A square wave of 20K or greater is input to INUH, INVH, and INWH via signal generator 9. For example, to test the operating current of the VBU phase, power is turned on for the VBU, then the second relay K2 and the third relay K3 are disconnected. The current detector then measures the VBS operating dynamic current. Upon completion of the test, the first relay K1, the second relay K2, and the third relay K3 are disconnected. Finally, all power supplies are disconnected. The working current test function is achieved by controlling the first relay K1, the second relay K2 and the third relay K3. This can optimize the working current test of the power module, improve the test accuracy and ensure the reliability of the product test.

[0058] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, article, or device comprising the element.

[0059] The embodiments of the present invention are described above in conjunction with the accompanying drawings. What is disclosed is only a preferred embodiment of the present invention. However, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms and equivalent changes without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A power module VBS operating current test circuit, characterized in that: include: A power supply, a control chip, a first upper bridge arm, a second upper bridge arm, a third upper bridge arm, a first lower bridge arm, a second lower bridge arm, a third lower bridge arm, a signal generator, a first relay, a second relay, a third relay, and multiple control power supplies; The power supply is used to power the control chip; the input end INUH of the first upper bridge arm, the input end INVH of the second upper bridge arm, and the input end INWH of the third upper bridge arm are respectively connected to the signal generator and used as control ends of high and low level PWM pulses; The source of the first upper bridge arm is connected to the drain of the first lower bridge arm, the source of the second upper bridge arm is connected to the drain of the second lower bridge arm, and the source of the third upper bridge arm is connected to the drain of the third lower bridge arm; The gate of the first upper bridge arm, the gate of the second upper bridge arm, the gate of the third upper bridge arm, the gate of the first lower bridge arm, the gate of the second lower bridge arm, and the gate of the third lower bridge arm are respectively connected to the control chip; the drain of the first upper bridge arm is respectively connected to the drain of the second upper bridge arm and the drain of the third upper bridge arm and are commonly connected to the bus voltage input terminal P; the source of the first lower bridge arm is used to connect to the module external pin NU, the source of the second lower bridge arm is used to connect to the module external pin NV, and the source of the third lower bridge arm is used to connect to the module external pin NW; The U-phase bootstrap terminal VB1 of the control chip is connected to the positive electrode of the control power supply, the V-phase bootstrap terminal VB2 of the control chip is connected to the positive electrode of the control power supply, the W-phase bootstrap terminal VB3 of the control chip is connected to the positive electrode of the control power supply, and the negative electrode of the control power supply is grounded; The input end of the first relay is used to input the U-phase working current, and the output end of the first relay is connected to the source of the first upper bridge arm; The input end of the second relay is used to input the V-phase working current, and the output end of the second relay is connected to the source of the second upper bridge arm; The input end of the third relay is used to input the W-phase working current, and the output end of the third relay is connected to the source of the third upper bridge arm; The working current test function is achieved by controlling the first relay, the second relay and the third relay.

2. The power module VBS operating current test circuit according to claim 1, characterized in that: The power module VBS operating current test circuit also includes a first capacitor, the two ends of which are respectively connected to the power supply and the COM port of the control chip for filtering out high-frequency signals; the COM port of the control chip is also grounded.

3. The power module VBS operating current test circuit according to claim 1, characterized in that: The power module VBS operating current test circuit further includes a second capacitor, and two ends of the second capacitor are respectively connected to the COM port of the control chip and the RS port of the control chip.

4. The power module VBS operating current test circuit according to claim 1, characterized in that: The power module VBS operating current test circuit further includes a first resistor, one end of the first resistor is connected to the EN port of the control chip, and the other end of the first resistor is used to connect to a fixed power supply.

5. A method for testing the VBS operating current of a power module, characterized in that: The test method is implemented based on the power module VBS operating current test circuit according to any one of claims 1 to 4, and the test method includes the following steps: S1. Place the sample to be tested on the test fixture and fix the sample to be tested; S2. Connect the first relay, second relay, and third relay to the test sample without power supply, so that the circuit remains open. S3. Apply necessary fixed power supply conditions to the functional pins of the power module, where the fixed power supply conditions are VCC = 15V, EN = 5V, VFAULT = 5V, INVL, INUL, and INWL = 0V; S4. Test the static working current of VB: Use the signal generator to control the high and low levels of INUH, INVH and INWH from 0 to 5V, and measure the static working current of VBS when the phase is at high or low level; S5. Test the dynamic working current of VB: input a square wave of 20K or more to INUH, INVH and INWH through the signal generator, and measure the dynamic working current of VBS when the phase is turned on or off; S6: After the test is completed, the first relay, the second relay and the third relay are disconnected; S7. Finally, disconnect all power supplies.

6. The power module VBS operating current testing method according to claim 5, characterized in that: The S4 specifically includes the following steps: Use a signal generator to control the high and low levels of INUH, INVH, and INWH to 0-5V, test the working current of the VBU phase, turn on the power to the VBU, and then disconnect the second relay and the third relay. At this time, the value measured by the current detector is the VBS working static current.

7. The power module VBS operating current testing method according to claim 5, characterized in that: The S5 specifically includes the following steps: Use a signal generator to input a square wave of 20K or more to INUH, INVH, and INWH to test the operating current of the VBU phase. Turn on the power to the VBU, and then disconnect the second relay and the third relay. At this time, the value measured by the current detector is the VBS operating dynamic current.

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