LED circuit with high dimming frequency

Details LED circuit with high dimming frequency LED circuit with high dimming frequency

2011-07-19

2011-07-19

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S18500S, C315S225000, C315S297000

Reexamination Certificate

active

07982412

ABSTRACT:
A LED circuit comprises: an inductor, a group of LEDs, a capacitor, a power MOS and a switching circuit. The inductor is connected to a voltage supply and a first node; the group of LEDs is connected to the first node and a ground potential; the capacitor is connected to the first node and a ground potential; the power MOS is connected to the first node and a ground potential, wherein the gate of the power MOS receives a switching signal such that the capacitor is charged when the power MOS is turn on to further turn on the LEDs and the capacitor is discharged when the power MOS is turn off to turn off the LEDs. The switching circuit is to generate the switching signal.

REFERENCES:
patent: 7145295 (2006-12-01), Lee et al.
patent: 7759881 (2010-07-01), Melanson
patent: 7855520 (2010-12-01), Leng
patent: 2008/0018261 (2008-01-01), Kastner
patent: 2008/0074058 (2008-03-01), Lee et al.
patent: 2008/0150449 (2008-06-01), Wang et al.
patent: 2008/0204395 (2008-08-01), Kang et al.
patent: 2009/0009105 (2009-01-01), Sakurai
patent: 2009/0295298 (2009-12-01), Chen et al.
patent: 2011/0043134 (2011-02-01), Lee

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