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A fault detection method, device and electrical equipment

A technology for fault detection and electrical equipment, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of insufficient output voltage value of the drive circuit, drive faults, etc., to avoid insufficient output voltage value, improve stability and safety. sexual effect

Active Publication Date: 2021-08-03
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a fault detection method, device, and electrical equipment to solve the problem in the prior art that the output voltage value of the drive circuit is insufficient, resulting in drive faults

Method used

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  • A fault detection method, device and electrical equipment
  • A fault detection method, device and electrical equipment
  • A fault detection method, device and electrical equipment

Examples

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Embodiment 1

[0049] This embodiment provides a fault detection method, which is applied to a switch drive system, figure 1 It is a structural diagram of a switch driving system according to an embodiment of the present invention, such as figure 1 As shown, the switch drive system includes a drive circuit 1, a photocoupler 2, and a power switch tube Q connected in sequence. The power switch tube Q includes a gate G, an emitter E, and a collector C. The emitter E and the collector C are used for for access to the load circuit.

[0050] figure 2 It is a flowchart of a fault detection method according to an embodiment of the present invention, such as figure 2 As shown, the fault detection method includes:

[0051] S101. Detect the positive voltage value and the negative voltage value output by the drive circuit.

[0052] Since the drive circuit outputs two voltage values, positive voltage and negative voltage, to the optocoupler, if one of the voltage values ​​is abnormal, the voltage o...

Embodiment 2

[0057] This embodiment provides another fault detection method. In order to ensure the accuracy of fault judgment, step S102 in the above embodiment specifically includes: if the positive voltage value satisfies the first preset condition, and the negative voltage value satisfies the second preset condition , it means that the voltage value output by the drive circuit is sufficient to drive the switch tube to act, and it is determined that the drive circuit has not failed; otherwise, it indicates that the output voltage value of the drive circuit is not enough to drive the switch tube to operate, and it is determined that the drive circuit has failed; wherein, the first preset The condition is: the positive voltage value is greater than or equal to the first threshold; the second preset condition is: the negative voltage value is less than or equal to the second threshold; the first threshold is positive, and the second threshold is negative, for example, the first threshold is ...

Embodiment 3

[0064] This embodiment provides another fault detection method, image 3 It is a flowchart of a fault detection method according to another embodiment of the present invention, such as image 3 As shown, the fault detection method includes:

[0065] S1, sampling the positive voltage U+ output by the driving circuit.

[0066] S2, comparing the positive voltage U+ output by the drive circuit with the first threshold U1, and judging whether U+≥U1 holds true; if yes, output a=1, and if not, output a=0.

[0067] S3, sampling the negative voltage U- output by the driving circuit.

[0068] S4, comparing the negative voltage U- output by the drive circuit with the second threshold U2, and judging whether U-≤U2 holds true; if yes, output b=0, and if not, output b=1.

[0069] S5, judge the values ​​of a and b, if a=0 and / or b=1, execute step S6; if a=1 and b=0, execute step S7.

[0070] S6, determining that the drive signal output is faulty.

[0071] S7, determining that the drive ...

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Abstract

The invention discloses a fault detection method, device and electrical equipment. Wherein, the method includes: detecting a positive voltage value and a negative voltage value output by the drive circuit; judging whether the drive circuit is faulty according to the positive voltage value and the negative voltage value. The present invention can avoid drive failure caused by insufficient output voltage value of the drive circuit, and improve the stability and safety of electrical equipment.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a fault detection method, device and electrical equipment. Background technique [0002] The power switch tube is a common component in electrical equipment. It is usually driven by a drive circuit. When the output voltage value of the drive circuit is not enough, it is easy to cause the power switch tube to turn on and off abnormally, resulting in failure. If the upper and lower power switch tubes in the electrical equipment are turned on, the bus bar will be short-circuited, resulting in excessive current, which will easily explode the tubes and reduce the safety of the electrical equipment. [0003] Aiming at the problem in the prior art that the output voltage value of the driving circuit is insufficient, resulting in a driving failure, no effective solution has been proposed yet. Contents of the invention [0004] Embodiments of the present invention provide a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R31/28
CPCG01R19/25G01R31/2825
Inventor 方明照黄猛王京肖尊辉安宏迪张珊
Owner GREE ELECTRIC APPLIANCES INC
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