Triple-loop fluorescent lamp driver

Details Triple-loop fluorescent lamp driver Triple-loop fluorescent lamp driver

2007-04-02

2008-10-14

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S224000, C315S274000

Reexamination Certificate

active

07436129

ABSTRACT:
A driver circuit provides electrical energy from a power source to a fluorescent lamp such as that used in a flat-panel or other liquid crystal display (LCD). The circuit includes a transformer having a primary winding and a secondary winding, with the ends of the secondary winding coupled to the fluorescent lamp. A first switch switchably provides a drive output signal to the transformer based upon a switch input signal. A current control loop adjusts the switch input in response to the current in one of the windings of the transformer, and a luminance control loop adjusts the switch input in response to the brightness of the light. A lamp current frequency control loop adjusts the polarity of the primary winding in response to a signal received from the transformer to thereby adjust the frequency of the lamp drive current applied to the fluorescent lamp.

REFERENCES:
patent: 4959594 (1990-09-01), Ruby
patent: 4998045 (1991-03-01), Ruby
patent: 5027034 (1991-06-01), Ruby et al.
patent: 5612593 (1997-03-01), Olson
patent: 5754013 (1998-05-01), Praiswater
patent: 5894394 (1999-04-01), Baba et al.
patent: 6118415 (2000-09-01), Olson
patent: 6222709 (2001-04-01), Baba
patent: 6947024 (2005-09-01), Lee et al.
patent: 2002/0121865 (2002-09-01), Nakatsuka et al.

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