Self-calibrating circuit interrupter
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United States of America Patent
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May 2, 2017
Issued Date -
N/A
app pub date -
Oct 21, 2014
filing date -
Oct 21, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A circuit interrupter includes phase and neutral conductive paths between a line side and a load side of the circuit interrupter. Differential and ground/neutral transformers are coupled to the phase and neutral paths. A circuit interrupter chip is coupled to the phase and neutral conductive paths, and to respective fault inputs from the transformers. A calibration circuit including a calibration resistor is coupled to a circuit interrupter controller. An interrupter circuit is configured to open the phase and neutral paths when a predetermined ground fault current condition is sensed. The circuit interrupter controller is configured to perform a self-calibration function to adjust a ground fault current trip-time response to maintain the ground fault current trip-time response within a predetermined range. Methods for using the self-calibrating circuit interrupter are also disclosed.
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