Circuit for driving light sources using balanced feedback...

Details Circuit for driving light sources using balanced feedback... Circuit for driving light sources using balanced feedback...

2011-08-16

2011-08-16

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S18500S, C315S2090SC, C315S210000, C315S224000, C315S225000, C345S102000, C345S419000

Reexamination Certificate

active

07999489

ABSTRACT:
An exemplary circuit (200) for driving light sources (211, 212, 213, 214) includes feedback circuits (218, 228, 238, 248), a signal balance circuit, and a controller (250). Each feedback circuit corresponds to a light source and is configured for providing a first feedback signal according to a driving current of the light source. The signal balance circuit is configured for balancing all the first feedback signals and correspondingly generating a second feedback signal. The controller is configured for driving the light sources to illuminate according to the second feedback signal.

REFERENCES:
patent: 6420839 (2002-07-01), Chiang et al.
patent: 7375736 (2008-05-01), Kao et al.
patent: 7737644 (2010-06-01), Lu et al.
patent: 2004/0100438 (2004-05-01), Lee et al.
patent: 2008/0067944 (2008-03-01), Wang et al.

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