Driving circuit for LED

Details Driving circuit for LED Driving circuit for LED

2009-09-08

2011-12-27

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S2090SC, C315S225000, C315S246000, C315S291000, C315S297000

Reexamination Certificate

active

08084962

ABSTRACT:
A driving circuit for LED includes: at least one LED; a light emission driving circuit having a first PWM unit and a power converting unit generating a driving current according to a signal generated by the first PWM unit and sending the driving current to the LED; a shunt parallel-connected with the LED; and a signal generating unit for generating a signal to switch on or off an electrical connection between the shunt and the light emission driving circuit. When the signal from the signal generating unit is at a high level, the electrical connection is switched on so that a majority of the residual driving current flows to the shunt.

REFERENCES:
patent: 7259525 (2007-08-01), Yang
patent: 7439945 (2008-10-01), Awalt et al.
patent: 7880404 (2011-02-01), Deng et al.
patent: 2008/0258695 (2008-10-01), Kumar et al.

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