Serial powering of an LED string

Details Serial powering of an LED string Serial powering of an LED string

2005-11-16

2008-03-04

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Supply circuit current and/or potential actuated switch

C315S122000, C315S312000, C315S247000, C315S18500S, C315S291000, C315S219000, C315S294000

Reexamination Certificate

active

07339323

ABSTRACT:
A circuit is used for driving a plurality of LEDs by an external voltage source. The LEDs are coupled in series. The circuit comprises a plurality of switches coupled to the LEDs in parallel, respectively, for individually controlling the brightness of the LEDs. The circuit further includes a plurality of Pulse-Width Modulation (PWM) signals coupled to the switches, respectively, for individually controlling the switches.

REFERENCES:
patent: 2005/0243022 (2005-11-01), Negru

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