Arc fault detection apparatus employing a comparator with a continuously variable threshold
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United States of America Patent
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Mar 1, 2011
Grant Date -
Feb 4, 2010
app pub date -
Aug 1, 2008
filing date -
Aug 1, 2008
priority date (Note) -
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Abstract
An arc fault detection apparatus that provides for better discrimination of electrical arcing events from nuisance loads. The arc fault detection apparatus includes an arcing sense circuit having a comparator circuit with a variable threshold voltage that varies continuously with the line voltage. The arc fault detection apparatus has reduced susceptibility to nuisance tripping in the presence of sudden changes in the load current that occur outside of a specified time window centered on each zero crossing point of the line voltage.
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