Detection circuit for washing machine door cover

Abstract

The invention relates to the field of home appliances and discloses a detection circuit for a washing machine door cover, which comprises a microswitch and a washing machine main control unit, wherein the microswitch is switched on and off by using the door cover, the washing machine main control unit is used for detecting the on and off states of the microswitch and respectively connected with two ends of the microswitch through ports A and B, the washing machine main control unit sends a pulse signal through the port A and receives the pulse signal through the port B to form an annular circuit. The scheme discards the mode that the washing machine main control unit in the prior art passively receives an opening / closing signal of the door cover, an active detection mode is adopted, and a bidirectional triode thyristor acts to control the operating state of the motor, which realizes that the opening / closing information of the door cover is detected in real time and avoids the problem that the opening / closing information of the door cover can not be rightly received by the washing machine main control unit due to the failure of a peripheral circuit in the prior art.

Description

technical field [0001] The invention relates to the field of home appliances, in particular to a door cover switch state detection circuit of a washing machine. Background technique [0002] During the use of the washing machine, the user often opens the door cover for various reasons. At this time, the motor of the washing machine is still working, which will cause potential danger to the user. Therefore, the opening and closing of the door cover of the general washing machine has a detection device. Once the user When the door is opened, the main control unit of the washing machine will receive a corresponding signal to shut down the motor and other related equipment, so as to avoid possible harm to the user. At present, ordinary pulsator washing machines use a micro switch as a judgment method to detect whether the door is open. The micro switch only has a simple switch signal. Generally, it is set to high level when the door is closed, and is set to Low level, the main ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the washing machine door cover circuit in the prior art adopts a single-party signal transmission and receiving mode, once a problem occurs in the circuit between the main control unit of the washing machine and the door cover circuit, the main control unit of the washing machine cannot follow the actual opening and closing of the door cover during the working process. To solve the problem of controlling the start and stop of the motor, the present invention proposes a circuit that uses ring pulses to detect the opening and closing of the door cover of the washing machine. The main control unit of the washing machine can judge whether the door cover of the washing machine is opened according to whether the pulse is received in the loop, completely avoiding the intermediate circuit Failure to start and stop the motor in time

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