LED driver circuit for providing desired luminance with...

Details LED driver circuit for providing desired luminance with... LED driver circuit for providing desired luminance with...

2011-01-04

2011-01-04

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Plural series connected load devices

Christmas lights

C315S20000A, C315S312000, C315S2090SC, C315S247000

Reexamination Certificate

active

07863825

ABSTRACT:
An LED driver circuit that sinks pure DC current through LEDs. According to the invention, a constant current sink circuit is coupled to a full bridge rectifier. The full bridge rectifier includes at least a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm. The first bridge arm and the fourth bridge arm are connected in parallel with the third bridge arm and the second bridge arm in opposite directions, respectively. The connection of the first bridge arm and the third bridge arm and the connection of the second bridge arm and the fourth bridge arm are connected in series. Each of the bridge arms may consist of at least one LED. The constant current sink circuit is used for sinking pure DC current. The LEDs can be driven by pure constant current and can provide desired luminance.

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