Discharge lamp lighting circuit and method

Details Discharge lamp lighting circuit and method Discharge lamp lighting circuit and method

2008-03-25

2008-03-25

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315S307000, C315SDIG002

Reexamination Certificate

active

11217178

ABSTRACT:
In a lighting circuit for a discharge lamp, the discharge lamp is kept lit without fail when a DC input voltage becomes low, while avoiding a complicated circuit configuration and control method. A DC-AC converter circuit receives a DC input voltage and converts it to an AC voltage and boosts the AC voltage. The DC-AC converter circuit is controlled by a control means having a circuit for detecting the DC input voltage “+B” to perform a lighting control of the discharge lamp. The lighting circuit comprises a transformer for AC conversion, switching elements, and resonance capacitor. The switching elements are driven to cause a series resonance of the resonance capacitor and an inductance component of the transformer for AC conversion or an inductance element. Upon detection of a reduction in the DC input voltage, the switching element driving frequency is shifted to a frequency lower than a frequency range when the discharge light is lit to increase the output voltage of the DC-AC converter circuit, thus maintaining the lighting state of the discharge lamp.

REFERENCES:
patent: 6580229 (2003-06-01), Murakami et al.
patent: 6784626 (2004-08-01), Otake et al.
patent: 6963178 (2005-11-01), Lev et al.
patent: 07-142182 (1995-06-01), None
patent: 07-169584 (1995-07-01), None

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