LED circuit

Details LED circuit LED circuit

2011-08-23

2011-08-23

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Plural series connected load devices

Electric switch controlled load device

C315S297000

Reexamination Certificate

active

08004201

ABSTRACT:
A LED circuit is provided. The LED circuit comprises: an inductor, a group of LEDs, a power MOS and a switching circuit. The switching circuit comprises: an error amplifier generating an error output, a PWM, a RC circuit and a control means. The PWM generates a switching signal according to the error output to control the power MOS to charge or discharge the group of LEDs; the RC circuit comprises at least one first capacitor each comprising a switch, at least one second capacitors; and a resistive means connected in series between the first and the second capacitors and the error output. The control means generates a control signal according to the dimming signal to turn on the switches to activate the first capacitors during the active period of the dimming signal and turn off the switches to deactivate the first capacitors during the inactive period of the dimming signal.

REFERENCES:
patent: 2009/0273290 (2009-11-01), Ziegenfuss

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