Discharge lamp lighting circuit

Details Discharge lamp lighting circuit Discharge lamp lighting circuit

2006-03-02

2008-08-26

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

07417381

ABSTRACT:
A DC/AC converter3performs AC conversion and a boosting function upon the reception of a DC voltage. A control unit6controls the DC/AC converter3to perform the lighting control of a discharge lamp. The DC/AC converter includes an AC conversion transformer7, switching devices5H,5L and a resonance capacitor8, and drives the switching devices to produce series resonance in the capacitor8and an inductance component for the transformer7or the inductance device9. Before the discharge lamp9is turned on, the drive frequency for the switching devices gradually nears a resonance frequency f1to increase an unloaded output, and a start signal is supplied to the discharge lamp. After the lighting of the discharge lamp has been initiated, the drive frequency is defined that is higher, by a predetermined frequency displacement value ΔF, than the drive frequency immediately before the discharge lamp is turned on. And the drive frequency for the switching device is shifted to a frequency area fb that is higher than a resonance frequency f2when the discharge lamp is turned on.

REFERENCES:
patent: 6919694 (2005-07-01), Moyer et al.
patent: 7075246 (2006-07-01), Muramatsu et al.
patent: 7-142182 (1995-06-01), None

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