Lighting circuit wherein the abnormality detection circuit gets

Details Lighting circuit wherein the abnormality detection circuit gets Lighting circuit wherein the abnormality detection circuit gets

1996-05-30

1998-07-21

Pascal, Robert J.

Electric lamp and discharge devices: systems

Special application

Vehicle

315308, 315DIG7, 315224, H05B 3702

Patent

active

057839085

ABSTRACT:
In a lighting circuit, a battery voltage is sent via a DC power supply section to a DC-AC converter to be converted to a square-wave AC voltage which is in turn supplied to a discharge lamp. The lighting circuit comprises an auxiliary power supply section for producing a predetermined voltage based on the input voltage from a battery and supplying this predetermined voltage to the individual sections of the lighting circuit and an abnormality detection circuit for detecting an abnormality in the discharge lamp, the circuit status, the battery voltage and so forth. In accordance with a signal from the abnormality detection circuit, a switch section, which is provided on a current line whose current is smaller than a current flowing on a power supply line to the discharge lamp, is switched on or off to enable or disable the auxiliary power supply section, thereby permitting or inhibiting power supply to the discharge lamp.

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