Light circuit for discharge lamp

Details Light circuit for discharge lamp Light circuit for discharge lamp

1997-02-06

1998-10-27

Pascal, Robert J.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Supply circuit current and/or potential actuated switch

315308, 315 82, 307 108, 361 79, H05B 3700

Patent

active

058281770

ABSTRACT:
A lighting circuit for a discharge lamp comprises detection means for detecting a voltage and/or a current to be applied to a discharge lamp or a voltage and/or a current equivalent thereto, input voltage/current detection means for detecting an input voltage and/or an input current to the lighting circuit, and abnormality detection means for stopping power supply to the discharge lamp when detecting an abnormality in the discharge lamp or a circuit abnormality based on those detection signals. In the abnormality detection means, a plurality of reference values for comparison or a plurality of reference ranges are set for the detection signals, and determination times are set in association with the reference values or reference ranges. The abnormality detection means compares the levels of the detection signals with each of the reference values or the reference ranges and determines that an abnormality in the discharge lamp or a circuit abnormality has occurred when a certain comparison result continues for an associated determination time or longer.

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