Switching LED driver

Details Switching LED driver Switching LED driver

2007-07-17

2007-07-17

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S224000, C315S169100, C323S282000, C323S283000, C323S267000

Reexamination Certificate

active

11265284

ABSTRACT:
The present invention provides a LED driver for controlling the brightness of the LED. An inductor and a switch are connected in series with the LED for controlling the current of the LED. A diode is coupled in parallel to the inductor for freewheeling the energy of the inductor through the LED. A control circuit is developed to generate a control signal for switching the switch in response a reflected signal of inductor and the LED current. The LED current is further adjusted in response to the reflected signal. The value of the reflected signal is correlated to the LED temperature. Therefore the LED current can be programmed in accordance with the LED temperature.

REFERENCES:
patent: 5642130 (1997-06-01), Browne
patent: 6721192 (2004-04-01), Yang et al.
patent: 6798152 (2004-09-01), Rooke et al.
patent: 6801028 (2004-10-01), Kernahan et al.
patent: 6836415 (2004-12-01), Yang et al.
patent: 6888383 (2005-05-01), Fairbanks
patent: 7116294 (2006-10-01), Stopa
patent: 2005/0151708 (2005-07-01), Farmer et al.
patent: 2006/0214603 (2006-09-01), Oh et al.
U.S. Appl. No. 11/268,536 by Yang, filed Nov. 8, 2005.

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