Discharge lamp lighting apparatus

Details Discharge lamp lighting apparatus Discharge lamp lighting apparatus

2007-07-03

2007-07-03

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

C315S224000, C315S276000

Reexamination Certificate

active

11546283

ABSTRACT:
A resonant transformer is disposed at a stage following an inverter for inverting the polarity of a voltage applied to a discharge lamp. A parallel resonant circuit is formed by a resonant capacitor and a primary winding of the resonant transformer, and a periodic voltage applying section is connected to the parallel resonant circuit. The periodic voltage applying section is operated at a frequency that causes resonance in the parallel resonant circuit, thereby applying a high AC voltage to the discharge lamp in a period in which discharge is started in the discharge lamp.

REFERENCES:
patent: 6570343 (2003-05-01), Shoji et al.
patent: 6630797 (2003-10-01), Qian et al.
patent: 03-030291 (1991-02-01), None
patent: 2003-217888 (2003-07-01), None
patent: 2004-327117 (2004-11-01), None

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