Lamp driver circuit and method for driving a discharge lamp

Details Lamp driver circuit and method for driving a discharge lamp Lamp driver circuit and method for driving a discharge lamp

2011-08-02

2011-08-02

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S224000, C315S308000

Reexamination Certificate

active

07990076

ABSTRACT:
A lamp driver circuit (400) comprises a feedback circuit for controlling stable operation of a discharge lamp (La), e.g. an inductively coupled discharge lamp such as a molecular radiation lamp, and for controlling a light output level of the discharge lamp (La). In particular, if the discharge lamp (La) is operated at a dimmed light output level, the light output is sensitive to changes in the lamp voltage (VLa), possibly resulting in flickering. In order to control stable lamp operation and prevent flickering, a high-sp feedback circuit is provided for controlling an operating frequency. In order to provide a relatively large dimming range for controlling the light output level, a low-speed feedback circuit is provided for controlling a DC supply voltage level (VDC).

REFERENCES:
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patent: 7291990 (2007-11-01), Ichikawa et al.
patent: 2004/0239262 (2004-12-01), Ido et al.
patent: 2005/0093459 (2005-05-01), Kishinevsky
patent: 2006/0017388 (2006-01-01), Stevenson
patent: 19708791 (1998-09-01), None
patent: 0482705 (1992-04-01), None
patent: 9839950 (1998-09-01), None

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