Relay anti-adhesion circuit and control method thereof

Abstract

The invention discloses a relay anti-adhesion circuit and a control method thereof. The relay anti-adhesion circuit comprises a voltage zero-crossing signal collection module, a current zero-crossing collection module, an electrical level comparison module, a processor module and a relay drive circuit module. A signal output end of the voltage zero-crossing signal collection module is connected with the processor module. A signal output end of the current zero-crossing signal collection module is connected with an input end of the electrical level comparison module. An output end of the electrical level comparison module is connected with the processor module. The processor module is also connected with the relay drive circuit module. The processor module processes feedback information of the voltage zero-crossing signal collection module and the electrical level comparison module through built-in software and provides an input signal to the relay drive circuit module. The relay anti-adhesion circuit and the control method thereof have advantages that the anti-disturbance performance of the circuit is enhanced by adopting an isolation alternating-current optocoupler and an isolation operational amplifier to perform the isolation; the relay anti-adhesion circuit applicable to an inductive load and a capacitive load; and the reliability of a relay is improved and the service life of the relay is prolonged.

Description

technical field [0001] The invention relates to a relay circuit, in particular to a relay anti-adhesion circuit and a control method thereof. Background technique [0002] At present, in the field of smart switches in smart homes, power relays are generally used as switching devices for 220V AC power supplies. When the relay drives non-pure resistive loads such as LEDs, halogen lamps, and motors, overcurrent and overvoltage that exceed the normal operating voltage by several times or even dozens of times will occur at the moment of contact suction and disconnection, causing the relay to touch The point melting caused the accident that the adhesion could not be disconnected, resulting in the load being always on and unable to be turned off. [0003] When such a sticking situation occurs, there are generally the following solutions: [0004] (1) Replace the relay with larger capacity; [0005] (2) Connect an RC circuit or a varistor in parallel at both ends of the relay con...

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Problems solved by technology

[0006] However, the above two methods cannot completely eliminate the possibility of relay contact adhesion, so a better solution is needed to solve the problem of relay contact adhesion

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