Arc fault detector with immunity to tungsten bulb burnout...

Details Arc fault detector with immunity to tungsten bulb burnout... Arc fault detector with immunity to tungsten bulb burnout...

G - Physics

01

R

G01R 31/02 (2006.01) H01H 83/00 (2006.01) H01H 83/02 (2006.01) H02H 1/00 (2006.01) H02H 1/04 (2006.01)

Patent

CA 2248493

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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