Circuits and methods for driving light sources

Details Circuits and methods for driving light sources Circuits and methods for driving light sources

2010-12-14

2011-10-18

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S192000, C315S307000, C315S308000

Reexamination Certificate

active

08040071

ABSTRACT:
In one embodiment, a driving circuit includes an AC/DC converter which converts an AC voltage to a DC voltage and a DC/DC linear regulator which regulates a current through, e.g., an LED light source, according to a first current reference if a monitoring signal indicating the DC voltage is within a predetermined range, and regulates the current according to a second current reference less than the first current reference if the monitoring signal is beyond the predetermined range. In another embodiment, a controller controlling power to an LED light source turns on a first plurality of LEDs and turns off a second plurality of LEDs if a monitoring signal indicative of a DC voltage received by the LED light source is within a predetermined range, and turns on both first and second plurality of LEDs if the monitoring signal is beyond the predetermined range.

REFERENCES:
patent: 6856103 (2005-02-01), Hudson et al.
patent: 7622871 (2009-11-01), Awalt et al.
patent: 7791326 (2010-09-01), Dahlman et al.

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