Power module detection device

Abstract

The utility model discloses a power module detection device which comprises a detected power module and a power module detection module. The tested power module comprises a power conversion unit, a direct current capacitor unit, a driving detection port and a power port; the power module detection module comprises a control detection unit, a switch network, a protection assembly and a power supply. The power module detection module is connected with a power port and a driving detection port of the detected power module, and the power conversion unit is connected with the power supply through the switch network and the protection assembly. The control detection unit is connected with a connection port between the switching network and the power port, the driving detection port and a power supply; the power module detection module can rapidly identify the state of the power module, timely find out a fault power module, avoid the influence on the work of a converter, and is small in test occupied space and flexible in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power, in particular to a power module detection module. Background Art

[0002] As the power level of new energy converters continues to increase, the output current is also increasing. Due to the cost and current level of power devices, new energy converters are currently usually implemented in parallel with IGBTs. Taking the construction of a three-level power module with a half-bridge IGBT module as an example, a single-phase power module contains 6 IGBT modules and 12 groups of drive signals when two are connected in parallel. As the number of parallel connections increases, the number of IGBTs will also increase exponentially, which increases the complexity of assembly and the probability of power module failure. How to quickly identify the status of the power module is particularly important. In the current situation, the method of performing a double pulse test on the module is usually used for identification. The double pulse test requires a test fixture composed of a DC source, an air-core inductor and an oscilloscope, and the test cycle is long. In addition, the test fixture is usually large and inconvenient for use in the production line or on-site layout, and is not convenient for on-site use. The prior art lacks a convenient power module test device. Utility Model Content

[0003] The technical problem to be solved by the utility model is to propose a power module detection module, which can quickly identify the state of the power module, find out the faulty power module in time, avoid affecting the operation of the converter, take up little test space, and is flexible to operate.

[0004] In order to solve the above technical problems, the utility model provides a power module detection device, comprising a power module to be tested and a power module detection module; the power module to be tested comprises a power conversion unit, a DC capacitor unit, a drive detection port, and a power port; the power module detection module comprises a control detection unit, a switch network, a protection component, and a power supply; the power module detection module is connected to the power port and the drive detection port of the power module to be tested, the power conversion unit is connected to the power supply through the switch network and the protection component, and the control detection unit is connected to the connection port between the switch network and the power port, the drive detection port, and the power supply;

[0005] The power conversion unit includes at least one-phase power bridge arm, and the switch network includes an independent switching device corresponding to a DC port or an AC port of the one-phase power bridge arm, and multiple pairs of interlocked normally open and normally closed switching devices corresponding to the other two DC ports or another DC port of the one-phase power bridge arm. The power supply energizes the corresponding device path that needs to be detected of the one-phase power bridge arm through the independent switching device and the interlocked normally open and normally closed switching devices.

[0006] Preferably, the power module under test is a two-level power module, and the one-phase power bridge arm comprises a DC port P, a DC port N, and an AC port AC.

[0007] Preferably, the power module under test is an I-type mid-point clamped three-level power module, an active mid-point clamped three-level power module, or a T-type three-level power module; and the single-phase power bridge arm comprises a DC port P, a DC port O, a DC port N, and an AC port AC.

[0008] Preferably, the control detection unit is used to detect the voltage of the connection port between the switch network and the power port, provide a drive detection signal for the power module under test, and provide a drive detection signal for the switch network.

[0009] Preferably, the independent switch device and the normally open and normally closed switch device are relays or contactors.

[0010] Preferably, the protection component is a resistor or a resistor-capacitor network.

[0011] Preferably, a power bridge arm of one phase of the power module under test is composed of an IGBT or a MOS tube.

[0012] Preferably, the power module under test is an active midpoint clamped three-level power module, the one-phase power bridge arm includes a power upper bridge arm and a power lower bridge arm, the power upper bridge arm includes a first IGBT device T1, a second IGBT device T2, and a fifth IGBT device T5, the power lower bridge arm includes a third IGBT device T3, a sixth IGBT device T6, and a fourth IGBT device T4, the first IGBT device T1, the fifth IGBT device T5, the sixth IGBT device T6, and the fourth IGBT device T4 are connected in series in sequence, the second IGBT device T2 is connected in series with the third IGBT device T3, and then connected in parallel with the fifth IGBT device T5 and the sixth IGBT device T6, The collector of the first IGBT device T1 forms the DC port P of the one-phase power bridge arm, the emitter of the fourth IGBT device T4 forms the DC port N of the one-phase power bridge arm, the emitter of the fifth IGBT device T5 is connected to the collector of the sixth IGBT device T6 to form the DC port O of the one-phase power bridge arm, the emitter of the second IGBT device T2 is connected to the collector of the third IGBT device T3 to form the AC port AC of the one-phase power bridge arm, and the first IGBT device T1, the second IGBT device T2, the fifth IGBT device T5, the third IGBT device T3, the sixth IGBT device T6 and the fourth IGBT device T4 are all connected in parallel with an anti-phase freewheeling diode.

[0013] Preferably, the switch network includes a first independent switch device K1, a second independent switch device K2, a switch device assembly K3, a switch device assembly K4, a switch device assembly K5, a switch device assembly K6, a switch device assembly K7, and a switch device assembly K8, wherein the switch device assembly K3, the switch device assembly K4, the switch device assembly K5, and the switch device assembly K6 are respectively composed of a pair of interlocked normally open normally closed switch devices, and the switch device assembly K7 and the switch device assembly K8 are respectively composed of two pairs of interlocked normally open normally closed switch devices; a normally open normally closed switch device of the switch device assembly K3 and the switch device assembly K4 is connected to the direct current of the one-phase power bridge arm. The first independent switch device K1 and the second independent switch device K2 are respectively arranged on the branch corresponding to the DC port O of the one-phase power bridge arm and the branch corresponding to the AC port AC of the one-phase power bridge arm, and the two branches converge into one port. The switch device assembly K5 and the switch device K6 are connected between the branch corresponding to the DC port O of the one-phase power bridge arm and the branch corresponding to the AC port AC of the one-phase power bridge arm. A normally open normally closed switch device of the switch device assembly K6 is arranged on the branch corresponding to the DC port N of the one-phase power bridge arm, one of the switch devices of a pair of self-locking normally open normally closed switch devices of the switch device assembly K7 is arranged on the branch corresponding to one end of the power supply connected to the DC port P of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the other end of the power supply; one of the switch devices of another pair of self-locking normally open normally closed switch devices of the switch device assembly K7 is arranged on the branch corresponding to the other end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the power supply. One of the switch devices of one pair of self-locking normally open and normally closed switch devices of the switch device assembly K9 is arranged on the branch corresponding to the DC port P of the one-phase power bridge arm connected to one end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port P of the one-phase power bridge arm; One of the switch devices of the other pair of self-locking normally open and normally closed switch devices of the switch device assembly K9 is arranged on the branch corresponding to the other end of the power supply, and the other switch device is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm;One of the pair of self-locking normally open and normally closed switch devices of the switch device assembly K8 is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port O of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm, and one of the other pair of self-locking normally open and normally closed switch devices is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm. The branch corresponding to the DC port O of the one-phase power bridge arm is connected between the branch corresponding to the DC port N of the one-phase power bridge arm and the branch corresponding to the other end of the power supply. Another normally open normally closed switch of the switch component K5 is connected between the other end of the power supply and the DC port O of the one-phase power bridge arm, and another normally open normally closed switch of the switch component K6 is connected between the other end of the power supply and the AC port AC of the one-phase power bridge arm.

[0014] Preferably, the power module under test further includes a DC capacitor unit, and the DC capacitor unit is connected in parallel to the power conversion unit.

[0015] After adopting the above device, the power module detection device includes a power module to be tested and a power module detection module; the power module to be tested includes a power conversion unit, a DC capacitor unit, a drive detection port, and a power port; the power module detection module includes a control detection unit, a switch network, a protection component, and a power supply; the power module detection module is connected to the power port and the drive detection port of the power module to be tested, the power conversion unit is connected to the power supply through the switch network and the protection component, the control detection unit is connected to the connection port between the switch network and the power port, the drive detection port, and the power supply; The power conversion unit includes at least one-phase power bridge arm, and the switch network includes an independent switch device corresponding to a DC port or an AC port of the one-phase power bridge arm, and multiple pairs of interlocked normally open and normally closed switch devices corresponding to the other two DC ports or another DC port of the one-phase power bridge arm. The power supply energizes the corresponding device path that needs to be detected of the one-phase power bridge arm through the independent switch device and the interlocked normally open and normally closed switch device; the power module detection module can quickly identify the power module status, find out the faulty power module in time, avoid affecting the operation of the converter, and the test occupies a small space and is flexible to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1The overall circuit of the power module detection device of the utility model Figure 1 ;

[0017] Figure 2 The overall circuit of the power module detection device of the utility model Figure 2 .

[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.

[0021] Embodiment 1

[0022] See also Figure 1 , Figure 1 The overall circuit of the power module detection device of the utility model Figure 1 ;

[0023] The present embodiment discloses a power module detection device, including a power module to be tested 1 and a power module detection module; the power module to be tested includes a power conversion unit 11, a drive detection port, and a power port; the power module detection module 2 includes a control detection unit 21, a switch network 22, a protection component 23, and a power supply 24; the power module detection module 2 is connected to the power port and the drive detection port of the power module to be tested 1, the power conversion unit 11 is connected to the power supply 24 through the switch network 22 and the protection component 23, and the control detection unit 21 is connected to the connection port between the switch network 22 and the power port, the drive detection port, and the power supply 24;

[0024] The power conversion unit 11 includes at least one-phase power bridge arm, and the switch network 22 includes an independent switching device corresponding to a DC port or an AC port of the one-phase power bridge arm, and multiple pairs of interlocked normally open and normally closed switching devices corresponding to the other two DC ports or another DC port of the one-phase power bridge arm. The power supply 24 energizes the corresponding device path that needs to be detected of the one-phase power bridge arm through the independent switching device and the interlocked normally open and normally closed switching devices.

[0025] Embodiment 2

[0026] This embodiment is based on the first embodiment. In this embodiment, the power module 1 under test is a two-level power module, and the one-phase power bridge arm includes a DC port P, a DC port N, and an AC port AC.

[0027] Embodiment 3

[0028] This embodiment is based on the first embodiment. In this embodiment, the power module 1 under test is an I-type mid-point clamped three-level power module or an active mid-point clamped three-level power module or a T-type three-level power module; the one-phase power bridge arm includes a DC port P, a DC port O, a DC port N, and an AC port AC.

[0029] Embodiment 4

[0030] This embodiment is based on the first embodiment. In this embodiment, the control detection unit 21 is used to detect the voltage of the connection port between the switch network 22 and the power port, provide a drive detection signal for the power module 1 under test, and provide a drive detection signal for the switch network 22.

[0031] Embodiment 5

[0032] This embodiment is based on the first embodiment. In this embodiment, the independent switch device and the normally open normally closed switch device are relays or contactors;

[0033] The protection component 23 is a resistor or a resistor-capacitor network;

[0034] In this embodiment, one-phase power bridge arm of the tested power module 1 is composed of IGBT or MOS tube.

[0035] Embodiment 6

[0036] This embodiment is based on the first embodiment. In this embodiment, the power module 1 under test is an active neutral point clamped three-level power module. The power conversion unit 11 includes a one-phase power bridge arm, and the one-phase power bridge arm includes a power upper bridge arm and a power lower bridge arm. The power upper bridge arm includes a first IGBT device T1, a second IGBT device T2, and a fifth IGBT device T5. The power lower bridge arm includes a third IGBT device T3, a sixth IGBT device T6, and a fourth IGBT device T4. The first IGBT device T1, the fifth IGBT device T5, the sixth IGBT device T6, and the fourth IGBT device T4 are connected in series in sequence. The second IGBT device T2 is connected in series with the third IGBT device T3 and then connected to the fifth IGBT device T5 and The sixth IGBT device T6 is connected in parallel, the collector of the first IGBT device T1 forms the DC port P of the one-phase power bridge arm, the emitter of the fourth IGBT device T4 forms the DC port N of the one-phase power bridge arm, the emitter of the fifth IGBT device T5 is connected to the collector of the sixth IGBT device T6 to form the DC port O of the one-phase power bridge arm, the emitter of the second IGBT device T2 is connected to the collector of the third IGBT device T3 to form the AC port AC of the one-phase power bridge arm, and the first IGBT device T1, the second IGBT device T2, the fifth IGBT device T5, the third IGBT device T3, the sixth IGBT device T6 and the fourth IGBT device T4 are all connected in parallel with anti-phase freewheeling diodes.

[0037] In this embodiment, the switch network includes a first independent switch device K1, a second independent switch device K2, a switch device assembly K3, a switch device assembly K4, a switch device assembly K5, a switch device assembly K6, a switch device assembly K7, and a switch device assembly K8. The switch device assembly K3, the switch device assembly K4, the switch device assembly K5, and the switch device assembly K6 are respectively composed of a pair of interlocked normally open normally closed switch devices, and the switch device assembly K7 and the switch device assembly K8 are respectively composed of two pairs of interlocked normally open normally closed switch devices; a normally open normally closed switch device of the switch device assembly K3 and the switch device assembly K4 is connected to the one-phase power bridge arm. The branch corresponding to the DC port P of the single-phase power bridge arm and the branch corresponding to one end of the power supply, another normally open normally closed switch device of the switch device assembly K3 is connected between one end of the power supply and the DC port O of the single-phase power bridge arm, and another normally open normally closed switch device of the switch device assembly K4 is connected between one end of the power supply and the AC port AC of the single-phase power bridge arm; the first independent switch device K1 and the second independent switch device K2 are respectively arranged on the branch corresponding to the DC port O of the single-phase power bridge arm and the branch corresponding to the AC port AC of the single-phase power bridge arm, and the two branches converge into one port, the switch device assembly K5 and the switch A normally open normally closed switch device of the switch device assembly K6 is arranged on the branch corresponding to the DC port N of the one-phase power bridge arm; one of the switch devices of a pair of self-locking normally open normally closed switch devices of the switch device assembly K7 is arranged on the branch corresponding to the DC port P of the one-phase power bridge arm connected to one end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the other end of the power supply; one of the switch devices of another pair of self-locking normally open normally closed switch devices of the switch device assembly K7 is arranged on the branch corresponding to the other end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the power supply. One of the switch devices of one pair of self-locking normally open and normally closed switch devices of the switch device assembly K9 is arranged on the branch corresponding to the DC port P of the one-phase power bridge arm connected to one end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port P of the one-phase power bridge arm; One of the switch devices of the other pair of self-locking normally open and normally closed switch devices of the switch device assembly K9 is arranged on the branch corresponding to the other end of the power supply, and the other switch device is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm;One of the switch devices of a pair of self-locking normally open and normally closed switch devices of the switch device assembly K8 is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port O of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm. One of the switch devices of the other pair of self-locking normally open and normally closed switch devices is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port O of the one-phase power bridge arm. One normally open and normally closed switch device of the switch device assembly K5 and the switch device assembly K6 is connected between the branch corresponding to the DC port N of the one-phase power bridge arm and the branch corresponding to the other end of the power supply. The other normally open and normally closed switch device of the switch device assembly K5 is connected between the other end of the power supply and the DC port O of the one-phase power bridge arm. The other normally open and normally closed switch device of the switch device assembly K6 is connected between the other end of the power supply and the AC port AC of the one-phase power bridge arm.;

[0038] The control detection unit 21 is used to set three thresholds, the first threshold Von0, the second threshold Von1, and the third threshold Von2. Von0 represents the conduction voltage drop of one power device, Von1 represents the conduction voltage drop of two power devices, and Von2 represents the conduction voltage drop of three power devices.

[0039] First, detect the upper power arm. Close the switch device K9 and the switch device K1, and detect the voltage between the DC port P and the DC port O of the power bridge arm and record its absolute value as V PO , if V PO <Von0, it can be judged that both T1 / D1 and T5 / D5 are short-circuited. If Von0 < V PO <Von1, further disconnect K1 and close K2, and detect the voltage between the DC port P of the power bridge arm and the AC port AC and record its absolute value as V PAC , if V PAC <Von0, it is judged that D5 is normal and D1 and D2 are short-circuited. If Von0 < V PAC <Von1, further disconnect the switch device K1, close the switch devices K2 and K3, and give a turn-on signal to T5. Detect the voltage between the DC port O of the power bridge arm and the AC port AC and record its absolute value as V ACO , if Von1 < V ACO <Von2, it can be judged that T1 / D1 is short-circuited and T2 / D2 and T5 / D5 are normal, otherwise it is judged that T1 / D1 is normal and T2 / D2 and T5 / D5 are short-circuited. If Von1 < V PAC<From Von2, determine if D5 is short - circuited and D1, D2 are normal; otherwise, D2 is open - circuited.

[0040] If Von1 < V PO <From Von2, determine if D1 and D5 are both normal; otherwise, further operate to disconnect K1 and close K2, and detect the voltage between the DC port P and the AC port AC of the power bridge arm and record its absolute value as V PAC , if V PAC <From Von0, determine if D5 is open - circuited and D1, D2 are short - circuited; otherwise, if Von0 < V PAC <From Von1, further close switch device K7, switch device K2, and give a turn - on signal to T1, detect the voltage between the DC port P and the AC port AC of the power bridge arm and record its absolute value as V PAC , if V PAC >Von2, it can be determined that T1 / D1 is short - circuited and T2 / D2 is normal; otherwise, T2 / D2 is short - circuited and T1 / D1 is normal. If Von1 < V PAC <From Von2, determine if D5 is open - circuited and D1, D2 are normal; otherwise, further disconnect switch device K1, close switch devices K2 and K3 while giving a turn - on signal to T5, detect the voltage between the DC port O and the AC port AC of the power bridge arm and record its absolute value as V ACO , if V ACO >Von2, further disconnect switch devices K2 / K3, close switch devices K1 / K4 while T2 = 1, detect the voltage between the DC port O and the AC port AC of the power bridge arm and record its absolute value as V ACO , if still V ACO >Von2, it can be determined that T1 / D1 or T2 / D2 or T5 / D5 is open - circuited or the drives of T5 and T2 fail; otherwise, D1 is open - circuited and the drive of T5 fails. Otherwise, if Von1 < V ACO <From Von2, further disconnect switch devices K2 / K3, close switch devices K1 / K4 while giving a turn - on signal to T2, detect the voltage between the DC port O and the AC port AC of the power bridge arm and record its absolute value as V ACO , if Von1 < V ACO <From Von2, it can be determined that D1 is open - circuited, T2 / D2 and T5 / D5 are normal; otherwise, T1 / D1 is open - circuited, the drive of T2 fails, and T5 is normal. Otherwise, if Von0 < V ACO <From Von1, further give a turn - on signal to T5 and continue to monitor the voltage between the O - end and the AC - end and record its absolute value as V ACO , if still Von0 < V ACO <From Von1, it can be determined that T1 / D1 is open - circuited and T5 / D5 is short - circuited; otherwise, T1 / D1 is open - circuited, T2 / D2 is short - circuited, and T5 / D5 is normal. Otherwise, if V ACO<From Von0, it can be determined that T1 / D1 is open-circuited, and T2 / D2 and T5 / D5 are short-circuited.

[0041] In this embodiment, the upper power bridge arm and the lower power bridge arm are symmetric. T1 and T4, T2 and T3, T5 and T6 are symmetric in position. The switching devices K3 and K5, K4 and K6, K7 and K8 in the switching network 22 are also symmetric. The testing process of the lower power bridge arm is the same as that of the upper power bridge arm.

[0042] Embodiment Seven

[0043] This embodiment is based on Embodiment Six. In this embodiment, the power module under test further includes a DC capacitor unit 12, and the DC capacitor unit 12 is connected in parallel to the power conversion unit.

[0044] The power module detection device can quickly identify the state of the power module, promptly find out the faulty power module, avoid affecting the operation of the converter, occupy a small space for testing, and is flexible in operation.

[0045] The preferred embodiments of the present application have been described above with reference to the accompanying drawings. However, the scope of the present application is not limited thereby. Any modifications, equivalent replacements, and improvements made by those skilled in the art without departing from the scope and essence of the present application shall fall within the scope of the rights of the present application.

Claims

1. A power module detection device, characterized in that: It includes a power module under test and a power module detection module; the power module under test includes a power conversion unit, a DC capacitor unit, a drive detection port, and a power port; the power module detection module includes a control detection unit, a switch network, a protection component, and a power supply; the power module detection module is connected to the power port and the drive detection port of the power module under test, the power conversion unit is connected to the power supply through the switch network and the protection component, and the control detection unit is connected to the connection port between the switch network and the power port, the drive detection port, and the power supply; The power conversion unit includes at least one-phase power bridge arm, and the switch network includes an independent switching device corresponding to a DC port or an AC port of the one-phase power bridge arm, and multiple pairs of interlocked normally open and normally closed switching devices corresponding to the other two DC ports or another DC port of the one-phase power bridge arm. The power supply energizes the corresponding device path that needs to be detected of the one-phase power bridge arm through the independent switching device and the interlocked normally open and normally closed switching devices.

2. The power module detection device according to claim 1, characterized in that: The power module under test is a two-level power module, and the one-phase power bridge arm includes a DC port P, a DC port N, and an AC port AC.

3. The power module detection device according to claim 1, characterized in that: The power module under test is an I-type midpoint clamped three-level power module, an active midpoint clamped three-level power module, or a T-type three-level power module; the one-phase power bridge arm includes a DC port P, a DC port O, a DC port N, and an AC port AC.

4. The power module detection device according to claim 1, characterized in that: The control detection unit is used to detect the voltage of the connection port between the switch network and the power port, provide a drive detection signal for the power module under test, and provide a drive detection signal for the switch network.

5. The power module detection device according to claim 1, characterized in that: The independent switch device and the normally open and normally closed switch device are relays or contactors.

6. The power module detection device according to claim 1, characterized in that: The protection component is a resistor or a resistor-capacitor network.

7. The power module detection device according to claim 3, characterized in that: One-phase power bridge arm of the power module under test is composed of IGBT or MOS tube.

8. The power module detection device according to claim 3, characterized in that: The power module under test is an active midpoint clamped three-level power module, the one-phase power bridge arm includes a power upper bridge arm and a power lower bridge arm, the power upper bridge arm includes a first IGBT device T1, a second IGBT device T2, and a fifth IGBT device T5, the power lower bridge arm includes a third IGBT device T3, a sixth IGBT device T6, and a fourth IGBT device T4, the first IGBT device T1, the fifth IGBT device T5, the sixth IGBT device T6, and the fourth IGBT device T4 are connected in series in sequence, the second IGBT device T2 is connected in series with the third IGBT device T3 and then connected in parallel with the fifth IGBT device T5 and the sixth IGBT device T6 ... first IGBT device T1, the fifth IGBT device T5, the sixth IGBT device T6, and the fourth IGBT device T4 are connected in series in sequence, the first IGBT device T1 The collector of the first IGBT device T1 forms the DC port P of the single-phase power bridge arm, the emitter of the fourth IGBT device T4 forms the DC port N of the single-phase power bridge arm, the emitter of the fifth IGBT device T5 is connected to the collector of the sixth IGBT device T6 to form the DC port O of the single-phase power bridge arm, the emitter of the second IGBT device T2 is connected to the collector of the third IGBT device T3 to form the AC port AC of the single-phase power bridge arm, and the first IGBT device T1, the second IGBT device T2, the fifth IGBT device T5, the third IGBT device T3, the sixth IGBT device T6 and the fourth IGBT device T4 are all connected in parallel with an anti-phase freewheeling diode.

9. The power module detection device according to claim 8, characterized in that: The switch network includes a first independent switch device K1, a second independent switch device K2, a switch device assembly K3, a switch device assembly K4, a switch device assembly K5, a switch device assembly K6, a switch device assembly K7, and a switch device assembly K8. The switch device assembly K3, the switch device assembly K4, the switch device assembly K5, and the switch device assembly K6 are respectively composed of a pair of interlocked normally open normally closed switch devices, and the switch device assembly K7 and the switch device assembly K8 are respectively composed of two pairs of interlocked normally open normally closed switch devices; a normally open normally closed switch device of the switch device assembly K3 and the switch device assembly K4 is connected to the DC port of the one-phase power bridge arm. The first independent switch device K1 and the second independent switch device K2 are respectively arranged on the branch corresponding to the DC port O of the one-phase power bridge arm and the branch corresponding to the AC port AC of the one-phase power bridge arm, and the two branches converge into one port. The switch device assembly K5 and the switch device assembly K6 are respectively arranged on the branch corresponding to the DC port O of the one-phase power bridge arm and the branch corresponding to the AC port AC of the one-phase power bridge arm, and the two branches converge into one port. The switch device assembly K6 and the switch device assembly K7 are respectively arranged on the branch corresponding to the DC port O of the one-phase power bridge arm and the branch corresponding to the AC port AC of the one-phase power bridge arm, and the two branches converge into one port. A normally open normally closed switch device of the component K6 is arranged on the branch corresponding to the DC port N of the one-phase power bridge arm, one of the switch devices of a pair of self-locking normally open normally closed switch devices of the switch device assembly K7 is arranged on the branch corresponding to the DC port P of the one-phase power bridge arm connected to one end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the other end of the power supply; one of the switch devices of another pair of self-locking normally open normally closed switch devices of the switch device assembly K7 is arranged on the branch corresponding to the other end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the other end of the power supply. One of the switch devices of one pair of self-locking normally open and normally closed switch devices of the switch device assembly K9 is arranged on the branch corresponding to the DC port P of the one-phase power bridge arm connected to one end of the power supply, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port P of the one-phase power bridge arm; one of the switch devices of the other pair of self-locking normally open and normally closed switch devices of the switch device assembly K9 is arranged on the branch corresponding to the other end of the power supply, and the other switch device is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm;One of the pair of self-locking normally open and normally closed switch devices of the switch device assembly K8 is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port O of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to one end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm, and one of the other pair of self-locking normally open and normally closed switch devices is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm, and the other switch device is connected between the branch corresponding to the other end of the power supply and the branch corresponding to the DC port N of the one-phase power bridge arm. The branch corresponding to the DC port O of the one-phase power bridge arm is connected between the branch corresponding to the DC port N of the one-phase power bridge arm and the branch corresponding to the other end of the power supply. Another normally open normally closed switch of the switch component K5 is connected between the other end of the power supply and the DC port O of the one-phase power bridge arm, and another normally open normally closed switch of the switch component K6 is connected between the other end of the power supply and the AC port AC of the one-phase power bridge arm.

10. The power module detection device according to claim 1, characterized in that: The power module under test further includes a DC capacitor unit, and the DC capacitor unit is connected in parallel to the power conversion unit.

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