Method and apparatus for supervisory circuit for ground fault circuit interrupt device
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United States of America Patent
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Aug 19, 2014
Grant Date -
Sep 15, 2011
app pub date -
Mar 7, 2011
filing date -
Mar 9, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus and method for a supervisory circuit for a ground fault detection device or a ground fault circuit interrupt (GFCI) device is disclosed in which a low voltage DC power supply is used to generate a test stimulus signal for a self test of the GFCI device. The GFCI device includes line and neutral conductors configured to connect an AC power source and a load. A differential current transformer includes a toroid, through which the line and neutral conductors pass, and a secondary winding wound on the toroid. A differential ground fault detector is electrically connected to the secondary winding of the differential current transformer to compare current generated in the secondary winding from an imbalance of magnetic flux in the toroid to a trip threshold. A wire conductor is routed through the toroid of the differential current transformer. A controller is configured to control a low voltage DC test stimulus signal to be generated in the wire conductor.
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