Abnormal current detecting circuit for circuit breaker

Abstract

Disposed herein is an abnormal current detection circuit for circuit breaker, comprising a full-wave amplifier 202, a positive wave-period comparator 203 for comparing a positive wave-period amplification voltage signal with a positive wave-period reference voltage signal to output a pulse signal, a negative wave-period comparator 204 for comparing a negative wave-period amplification voltage signal with a negative wave-period reference voltage signal to output a pulse signal, a combining circuit 206 for combining pulse signals outputted from the positive wave-period comparator and the negative wave-period comparator to output a full-wave combining signal, a reference voltage generator 209 for generating a reference voltage signal, and a comparative driving circuit section 208 for comparing the combining signal with the reference voltage signal to output a signal for controlling a circuit breaker to be driven to a circuit breaking position when the combining signal is greater or equal to the reference voltage signal.

Description

technical field [0001] The present invention relates to a circuit breaker, and more particularly, to an abnormal current detection circuit for the circuit breaker configured to electrically detect abnormal current in the circuit, thereby allowing the circuit breaker to cut off the circuit when the abnormal current flows in the circuit. Background technique [0002] A circuit breaker is a power device used to detect abnormal current to automatically disconnect the circuit, thereby protecting life, electric load equipment and circuits from power and load when abnormal currents such as overcurrent, short circuit current or others occur in the circuit. damage by fault currents in the supply circuit between them. Among such circuit breakers, the earth leakage circuit breaker is a circuit breaker having a function of breaking a circuit when leakage current, overcurrent and short circuit current are detected, thereby protecting life, load equipment and circuits from fault current. ...

AI Technical Summary

Problems solved by technology

This detection delay in circuit breakers that require fast tripping presents a problem that will cause damage to the load equipment and the circuit

[0006] Furthermore, in the abnormal current detection circuit for a circuit breaker according to the prior art, when its detection circuit is configured with typical electronic equipment, the characteristics of the equipment vary with temperature and production process speed variations (production process speed variations ) (i.e., low-speed products, standard-speed products, and high-speed products), or the characteristics of the integrated circuit may change in configuring the integrated circuit, thereby causing failure to provide reliable detection of abnormal current and failure to guarantee reliable operation of the circuit breaker question

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