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Switch fault diagnosis method and circuit and power supply system

A technology of switch failure and diagnosis method, which is applied in the direction of circuit breaker testing, etc., and can solve problems such as the inability to accurately determine the location of the fault

Pending Publication Date: 2021-02-12
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the embodiment of the present invention, a switch fault diagnosis method, circuit and power supply system are provided to solve the problem in the prior art that only the inverter bridge circuit is faulty, but the fault location cannot be accurately judged

Method used

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  • Switch fault diagnosis method and circuit and power supply system
  • Switch fault diagnosis method and circuit and power supply system
  • Switch fault diagnosis method and circuit and power supply system

Examples

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Embodiment 1

[0095] This embodiment provides a switch fault diagnosis method, which is applied to the inverter bridge circuit, as mentioned above figure 1 As shown in , the first terminal of the input side of the inverter bridge circuit is connected to the DC bus positive terminal DC+, the second terminal is connected to the DC bus negative terminal DC-, the DC bus positive terminal DC+, the current bus positive terminal DC+ and the DC bus negative terminal DC - The first bus capacitor C1 and the second bus capacitor C2 are connected across the bridge circuit, and the inverter bridge circuit includes a first upper bridge arm switch T1, a second upper bridge arm switch T2, a first lower bridge arm switch T3, and a second upper bridge arm switch T3. Two lower bridge arm switches T4, wherein the first upper bridge arm switch T1 is controlled by the first pulse signal PWM1, the second upper bridge arm switch T2 is controlled by the second pulse signal PWM2, and the first lower bridge arm switch...

Embodiment 2

[0105] This embodiment provides another switch fault diagnosis method. The corresponding relationship of the first phase voltage signal L_SIG0 in the conduction state of the first upper bridge arm switch is as follows: if the first phase voltage signal L_SIG0 is a high voltage signal, it means that the first upper bridge arm switch The bridge arm switch is turned on at this time, correspondingly, the first pulse signal PWM1 should be a high voltage signal, if the first phase voltage signal L_SIG0 is a low voltage signal, it means that the first upper bridge arm switch is turned off at this time , correspondingly, the first pulse signal PWM1 should be a low-voltage signal, that is, when the first upper bridge arm switch does not fail, the first phase voltage signal L_SIG0 should be consistent with the first pulse signal PWM1, if If they are not consistent, it indicates that a fault has occurred. Among them, consistency refers to the same high and low voltage conditions, not the ...

Embodiment 3

[0115] This embodiment provides a switch fault diagnosis circuit, which is used to implement the switch fault diagnosis method in the above embodiment, image 3 It is a structural diagram of a switch fault diagnosis circuit according to an embodiment of the present invention, such as image 3 As shown, the circuit includes a diagnostic module 1, and the diagnostic module 1 specifically includes:

[0116] The first sampling unit 11, whose input terminal is connected to the first phase output terminal L of the inverter bridge circuit, is used to generate the first sampling signal SIG1 according to the first phase voltage signal and the first pulse signal; wherein, the first pulse signal is an inverse Driving signal of the switch of the first upper bridge arm of the variable bridge circuit.

[0117] The second sampling unit 12, whose input terminal is connected to the second phase output terminal N of the inverter bridge circuit, is used to generate the second sampling signal SI...

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Abstract

The invention discloses a switch fault diagnosis method and circuit and a power supply system. The method comprises the steps: generating a first sampling signal according to a first phase voltage signal and a first pulse signal of an inverter bridge circuit, wherein the first pulse signal is a driving signal of a first upper bridge arm switch of the inverter bridge circuit; generating a second sampling signal according to a second phase voltage signal and a second pulse signal of the inverter bridge circuit, wherein the second pulse signal is a driving signal of a second upper bridge arm switch of the inverter bridge circuit; judging whether the first upper bridge arm switch fails or not according to the first sampling signal; and judging whether the second upper bridge arm switch fails or not according to the second sampling signal. According to the invention, whether a fault occurs or not can be accurately judged, the position of the power switch with the fault is determined, and subsequent maintenance or device replacement is facilitated.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a switch fault diagnosis method, circuit and power supply system. Background technique [0002] Power switch (composite full-control voltage-driven power semiconductor device composed of bipolar transistor and insulated gate field effect transistor, IGBT), due to its small driving power and low saturation voltage, it is more and more widely used in motors drive, inverter and other fields. [0003] As the frequency of use of power switches increases, power switch faults will occur frequently, and the most common types of faults are open circuit faults and short circuit faults. figure 1 It is the structural diagram of the existing inverter bridge circuit. At present, the output current or voltage of the inverter is used to judge whether an open-circuit fault or a short-circuit fault occurs. However, since there are multiple power switches in the inverter circuit, the e...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 张珊黄猛王京俞贤桥安宏迪杨博
Owner GREE ELECTRIC APPLIANCES INC