LED driver with multiple feedback loops

Details LED driver with multiple feedback loops LED driver with multiple feedback loops

2011-04-19

2011-04-19

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S159000, C315S247000, C315S297000

Reexamination Certificate

active

07928670

ABSTRACT:
An LED driver includes at least two interlocked closed feedback loops. One feedback loop controls the duty cycle of the on/off times of a switch connected in series to the LED string, and the other feedback loop controls the duty cycle of the on/off times of a power switch in the switching power converter that provides a DC voltage applied to the LED string. The LED driver of the present invention achieves fast control of the LED brightness and current sharing among multiple LED strings simultaneously in a power-efficient and cost-efficient manner.

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