LED dimming control technique for increasing the maximum PWM...

Details LED dimming control technique for increasing the maximum PWM... LED dimming control technique for increasing the maximum PWM...

2008-01-22

2008-01-22

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S246000, C315SDIG002, C315S291000, C315S2090SC

Reexamination Certificate

active

07321203

ABSTRACT:
Circuitry and methodology for providing LED dimming control in a LED driving system having a switching regulator for providing power supply to drive the LED. The switching regulator includes a switching circuit to which an oscillation signal is applied to control switching of the switching circuit. A dimming control input is supplied with a pulse-width modulation (PWM) dimming control signal to provide PWM dimming control of the LED. The dimming control input applies the PWM dimming control signal to control switching of the switching circuit. A synchronizing circuit is provided for synchronizing the oscillation signal to the PWM dimming control signal.

REFERENCES:
patent: 6624593 (2003-09-01), Blanchard
patent: 7215104 (2007-05-01), Nakata et al.
patent: 2004/0251854 (2004-12-01), Matsuda et al.
patent: 2006/0138973 (2006-06-01), Hirosawa
patent: 299 19 006 U 1 (2000-06-01), None
patent: 1 033 903 (2000-09-01), None
patent: WO 2004/057921 (2004-07-01), None
International Search Report issued in corresponding International Application No. PCT/US2006/034337, dated Jan. 19, 2007.
Written Opinion of the International Searching Authority issued in corresponding International Application No. PCT/US2006/034337, dated Jan. 19, 2007.

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