Lighting circuit utilizing DC power for a discharge lamp utilizi

Details Lighting circuit utilizing DC power for a discharge lamp utilizi Lighting circuit utilizing DC power for a discharge lamp utilizi

1995-09-08

1997-05-13

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315307, 315291, 315DIG7, 315119, G05F 100

Patent

active

056295880

ABSTRACT:
A lighting circuit converts the output voltage of a DC booster circuit to an AC voltage which is in turn supplied to a discharge lamp connected between AC output terminals. The lighting circuit comprises a short-circuit detector for detecting a change of a DC voltage from the DC booster circuit to a square-wave voltage when short-circuiting between one of the AC output terminals and ground occurs, and sends a detection signal via a hold circuit to a power cutoff relay circuit. As a result, a relay contact in the power cutoff relay circuit is opened to inhibit the operation of the lighting circuit.

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