Arc fault detector with immunity to tungsten bulb burnout and circuit breaker incorporating same
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United States of America Patent
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Sep 8, 1998
Grant Date -
N/A
app pub date -
Sep 29, 1997
filing date -
Sep 29, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A circuit breaker with an arc fault circuit provides immunity to false trips caused by tungsten bulb burnout and by a cold tungsten filament energized through a solid state dimmer. The detector circuit includes a pulse generator which generates pulses in response to the step increases in current occurring each time an arc is struck. A zener diode limits the amplitude of pulses generated by the pulse generator to a value which is below that of pulses generated by the tungsten lamp. When a time attenuated accumulation of these pulses reaches a predetermined value, the circuit breaker is tripped. By clipping the pulses with the zener diode, the few large pulses generated by tungsten bulb burnout or energization of a cold tungsten bulb by a solid state dimmer switch are insufficient to allow the time attenuated accumulation of pulses to reach the trip value.
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