Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults
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United States of America Patent
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Jul 10, 2012
Grant Date -
Jun 16, 2011
app pub date -
Dec 15, 2009
filing date -
Dec 15, 2009
priority date (Note) -
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Abstract
A direct current arc fault circuit interrupter includes separable contacts and a trip circuit to trip open the contacts. The trip circuit includes a number of alternating current sensors structured to sense a current flowing through the separable contacts, a number of filter circuits cooperating with the AC current sensors to output a number of AC signals, a number of peak detectors cooperating with the filter circuits to output a number of peak current signals, and a processor cooperating with at least the peak detectors. The processor inputs the number of peak current signals as a plurality of peak current signals or inputs the number of peak current signals and determines the plurality of peak current signals. The processor also determines if the peak current signals exceed corresponding predetermined thresholds for a predetermined time, and responsively causes the contacts to trip open.
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