Leakage protection circuit with leakage protection in circuit breaker

Abstract

The invention discloses a leakage protection circuit with leakage protection in circuit breaker capable of simplifying application circuit design. The leakage protection circuit comprises a rectifying circuit, a leakage current transformer, a leakage protection control circuit, a controllable electronic switch, a trip coil and a forcing trip circuit; two ends of the trip coil are respectively connected to the positive output end of the rectifying circuit and a corresponding switching end of the controllable electronic switch; the other switching end of the controllable electronic switch is connected to the negative output end of the rectifying circuit; the control end of the controllable electronic switch is connected to the output end of the leakage protection control circuit; the output ends of the leakage current transformer are respectively connected to corresponding ends of the leakage protection control circuit; the power supply end and the ground end of the forcing trip circuit are respectively connected to the power supply end and the ground end of the leakage protection control circuit; the noise suppression end and the output end of the forcing trip circuit are respectively connected to the noise suppression end and the output end of the leakage protection control circuit. According to the leakage protection circuit, the design of the application circuit can be greatly simplified.

Description

technical field [0001] The invention relates to a leakage protection circuit, in particular to a leakage protection circuit in a circuit breaker with leakage protection. Background technique [0002] At present, the structure of the leakage protection circuit in the traditional circuit breaker with leakage protection includes: a rectifier circuit, a leakage current transformer, a leakage protection control circuit composed of a leakage protection dedicated chip and its peripheral circuits, a tripping coil and a controllable Silicon, the input end of the rectification circuit is connected to the corresponding output end of the circuit breaker in one-to-one correspondence, the positive output end of the rectification circuit is connected to the input end of the tripping coil, the negative output end of the rectification circuit is connected to the leakage protection special chip The ground terminal is connected, the output terminal of the tripping coil is connected with the an...

AI Technical Summary

Problems solved by technology

This traditional leakage protection circuit does not have a forced tripping circuit. In practical applications, when a circuit breaker with this leakage protection circuit is used, the design of the application circuit is more complicated. When a certain electrical parameter reaches a certain value, it needs to be turned off. When the power supply is used, it is necessary to configure a special shutdown circuit; in addition, the shutdown time of the circuit breaker is relatively long, usually between 6 and 20 milliseconds

Images