Detection control device for circuit faults and domestic appliance

Abstract

The invention relates to a detection control device for circuit faults and a domestic appliance. The device comprises an earth leakage protection circuit and a fault arc detection circuit, wherein the earth leakage protection circuit comprises a tripping mechanism, a controller and a zero-sequence current mutual inductor; the zero-sequence current mutual inductor is used for acquiring first current signals on a live wire and a zero wire, and generating a first control signal; the controller is used for controlling the switch-on / off of the tripping mechanism according to the first control signal; the fault arc detection circuit comprises a current mutual inductor and an arc detection module; the current mutual inductor is used for acquiring a second current signal of the live wire; the arc fault detection module is used for generating a second control signal according to the second current signal; and the arc detection module is further used for applying the second control signal to the zero wire in order to control the switch-on / off of the tripping mechanism. The domestic appliance comprises a shell, a circuit main board and a detection control device for circuit faults. Through adoption of the control device and the domestic appliance, the influences of fault arcs are effectively eliminated, and the use security of electric appliances is enhanced.

Description

technical field [0001] The invention relates to the field of air conditioner fault detection, in particular to a circuit fault detection and control device and a household appliance. Background technique [0002] With the improvement of the quality of life, electrical appliances such as air conditioners and refrigerators are widely used by people, especially air conditioners, whose internal circuits are complex, and there may be bad electrical connections or fault arcs in internal circuits due to aging insulation. The common causes of arc faults are as follows: [0003] 1. Sharp devices pierce the power cord or external force squeezes the power cord, resulting in damage to the insulation layer of the power cord. [0004] 2. Welding, loosening or oxidation of the middle line and the line joint of the connecting line will lead to excessive contact resistance and high heat generation, which will cause the occurrence of fault arc. [0005] 3. Failure to use correct protection ...

AI Technical Summary

Problems solved by technology

[0003] 1. The power cord is pierced by a sharp device or extruded by an external force, resulting in damage to the insulation layer of the power cord

[0004] 2. False welding, loosening or oxidation of the middle line and the line joint of the connecting line, resulting in excessive contact resistance and high heat generation, resulting in the occurrence of arc faults

[0005] 3. Failure to use correct protection devices, such as circuit breakers, etc.

[0006] 4. Aging of wire insulation leads to breakdown of insulation layer

However, this method does not really detect the existence of fault arcs before they occur, and directly eliminate the hidden dangers of fault arcs at the source. Therefore, the risk of fire caused by fault arcs still exists

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