Lighting circuit for discharge lamp

Details Lighting circuit for discharge lamp Lighting circuit for discharge lamp

1998-06-08

2000-03-07

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315308, 315209R, 315DIG5, 315DIG7, G05F 100

Patent

active

060344903

ABSTRACT:
A lighting circuit for a discharge lamp capable of improving the lighting performance of a discharge lamp with a simple circuit structure to thereby prevent a lighting failure at the end of the lifetime of the discharge lamp. The lighting circuit 1 comprises a DC power supply circuit 2, DC-AC conversion means 3 for converting a DC voltage output from the DC power supply circuit 2 to an AC voltage and supplying the AC voltage to the discharge lamp 5, a circuit element 6 (a switch element or a current limiting element) for blocking or limiting a current counter-flowing to the DC power supply circuit 2 from the DC-AC conversion means 3, and an inductive load 4 connected in series to the discharge lamp 5. A series circuit of a Zener diode 7 and a passive element 8 (a capacitor or a resistor) is provided in parallel to the circuit element 6, so that when the Zener diode 7 conducts, a rise in an auxiliary voltage for reignition is suppressed.

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