FLAME RECTIFICATION SENSOR EMPLOYING PULSED EXCITATION

摘要

A flame rectification type flame sensor circuit and method in which a generator (51) injects periodic pulses of alternating voltage into a flame region (58), the voltage across the flame region (58) being processed by a filter/amplifier (60) which, in proper operation, produces a non-zero output signal only during the time a flame (58) is present and a pulse of alternating voltage is being supplied by the generator (51). Final indication of a flame (58) is produced only if a non-zero output signal occurs during the time a pulse of alternating voltage is being supplied, and not during the time between successive pulses of alternating voltage. Failure of an electrical component in the filter/amplifier (60) is indicated if a non-zero output signal occurs during the time between successive pulses of alternating voltage.