Failing lamp monitoring and deactivating circuit

Details Failing lamp monitoring and deactivating circuit Failing lamp monitoring and deactivating circuit

H - Electricity

05

B

315/41

H05B 37/00 (2006.01) H02H 3/50 (2006.01) H05B 37/03 (2006.01)

Patent

CA 1273051

A discharge lamp monitoring and deactivating circuit includes a normally closed switch in series with the discharge lamp and its ballast and a detector circuit connected across the lamp to monitor lamp operating voltage. The detector circuit includes capacitor which is charged and discharged through separate paths so that a lamp electrical waveform change waveform can be detected, resulting in a net charge. The charge is used to open the switch after a time delay which is only manually resetable.

547512

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