Fault detection circuit and electronic equipment

Abstract

The invention provides a fault detection circuit and electronic equipment, and relates to the technical field of fault detection. The fault detection circuit comprises a controller, a differential operation amplification module and a driving module, the controller is electrically connected with the differential operation amplification module and the driving module, the differential operation amplification module is further electrically connected with the driving module, and the driving module is used for being connected with a stepping motor; wherein the differential operation amplification module is used for collecting working current of the stepping motor and outputting detection voltage to the controller according to the working current; the controller is used for determining whether the driving module or the stepping motor fails or not according to the detection voltage and a preset first voltage when the stepping motor does not work; the controller is further used for determining whether the driving module or the stepping motor breaks down or not according to the detection voltage and a preset second voltage when the stepping motor works. According to the fault detection circuit and the electronic equipment provided by the invention, fault detection of the driving module and the stepping motor can be accurately realized.

Description

technical field [0001] The invention relates to the technical field of fault detection, in particular to a fault detection circuit and electronic equipment. Background technique [0002] The existing air-conditioning technology is developing rapidly. Because of the advantages of the expansion valve, the pressure of the air-conditioning system is gradually changed from capillary regulation to expansion valve regulation. The drive of the expansion valve is basically a stepping motor, while the control of the stepping motor in the prior art is basically In open loop, the angle of the expansion valve is controlled entirely by reset and counting steps. When the stepper motor is open circuited, short-circuited or the circuit of the stepper motor is abnormal, the expansion valve angle may be wrong, which will affect the system pressure and cause the air conditioner to be abnormal. [0003] However, there is currently no relevant detection circuit designed for stepping motor or driv...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a fault detection circuit and electronic equipment to solve the problem in the prior art that the stepper motor or drive circuit cannot be fault detected

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