Patent ID: 8422184
Filing Date: 2013-04-16
Classification: H02H

Abstract:
1. An overcurrent relay comprising: a Hall sensor detecting a failure current and outputting a Hall voltage signal; a filter filtering the Hall voltage signal to output a filtered signal; a first reference voltage provider providing a first reference voltage, wherein the first reference voltage provider is steplessly adjustable so as to provide various required reference voltages; a first comparator comparing the filtered signal from the filter with the first reference voltage and outputting a first trigger signal when the filtered signal reaches the first reference voltage; a first circuit breaker driver being triggered by the first trigger signal to output a first driving signal for driving a circuit breaker; a second reference voltage provider providing a second reference voltage, which is higher than the first reference voltage, wherein the second reference voltage provider is steplessly adjustable so as to provide various required reference voltages; a second comparator comparing the filtered signal with the second reference voltage and outputting an output when the filtered signal reaches the second reference voltage; a third comparator comparing the filtered signal with the output of the second comparator and outputting a second trigger signal when the filtered signal reaches the output of the second comparator; and a second circuit breaker driver being triggered by the second trigger signal to output a second driving signal for driving the circuit breaker.