Method and circuit for controlling an LED

Details Method and circuit for controlling an LED Method and circuit for controlling an LED

2008-10-06

2009-10-27

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S18500S, C315S192000, C315S224000, C315S308000

Reexamination Certificate

active

07609008

ABSTRACT:
A control circuit coupled to a power line controlled by a dimmer having a switching device includes, for example, an active power factor correction circuit receiving power from a bridge rectifier and storage capacitor and drawing an average continuous current when the switching device is “on.” An LED power driving circuit receives a controlled current from the active power factor correction circuit and generates an output current received by at least one LED outputting visible light. A positive voltage feedback circuit senses a feedback voltage across the LED, through the LED power driving circuit, and sends the feedback voltage to the active power factor correction circuit. A pump back power circuit is electrically coupled to the LED power driving circuit and applies a bias voltage to an output of the bridge rectifier to power the active power factor correction circuit when the switching device is “off.”

REFERENCES:
patent: 6441558 (2002-08-01), Muthu et al.
patent: 7262559 (2007-08-01), Tripathi et al.
patent: 7288902 (2007-10-01), Melanson
patent: 7439944 (2008-10-01), Huynh et al.
patent: 2007/0182347 (2007-08-01), Shteynberg et al.
patent: 2008/0018261 (2008-01-01), Kastner

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