Patent ID: 9190828
Filing Date: 2015-11-17
Classification: G01R,H02H

Abstract:
1. A detecting circuit for a circuit breaker, comprising: a detection sensor configured to output a detection signal by detecting a voltage or a current on an alternating current electric power circuit; a low pass filter connected to an output terminal of the detection sensor, and configured to output a signal from the detection sensor after removing a high frequency component from the signal from the detection sensor; an offset remover connected to an output terminal of the low pass filter, and configured to output a signal from the low pass filter after removing a direct current offset from the signal; an amplifier connected to an output terminal of the offset remover, and configured to amplify a signal from the offset remover and to output the signal; a comparator configured to output a breaking control signal such that the is circuit breaker operates to a circuit breaking position, if the detection signal input to the amplifier is equal to or larger than a reference voltage; and a sampling circuit connected to an output terminal of the amplifier, and configured to output a signal in a sampling manner from an output signal from the amplifier, at predetermined frequency intervals.