LED driving circuit and controlling method thereof

Details LED driving circuit and controlling method thereof LED driving circuit and controlling method thereof

2006-11-09

2010-06-01

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315S307000, C315S360000

Reexamination Certificate

active

07728530

ABSTRACT:
The invention discloses an LED driving circuit and a controlling method thereof, comprising a power switch and a current sampling unit, as well as a voltage comparison unit for comparing the voltage obtained by the current sampling unit with a first reference voltage; an input voltage sampling unit for converting the sampled input voltage into a current signal; a timing unit for controlling the off-time of the power switch or presetting a fixed off-time; a logical unit for controlling the power switch by means of a power switch driving unit and for controlling the timing switch in the timing unit. The method for controlling the LED driving circuit comprises the step of modulating the off-time of the power switch with the input voltage or the step of presetting a fixed off-time. The invention can be used in LED light cluster driving with the power factor greater than 0.95.

REFERENCES:
patent: 6747420 (2004-06-01), Barth et al.
patent: 7176668 (2007-02-01), Oswald et al.
patent: 7276861 (2007-10-01), Shteynberg et al.
patent: 7358706 (2008-04-01), Lys

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