Current control device for driving LED devices

Details Current control device for driving LED devices Current control device for driving LED devices

2006-10-10

2006-10-10

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S224000, C315S169100, C315S18500S, C340S815450, C340S636180

Reexamination Certificate

active

07119498

ABSTRACT:
A current control device for driving LED devices uses a switched-mode current control loop inside of an output intensity low-frequency pulse width modulation (PWM) control loop. This allows separate control of current level (for accurate light wavelength output) and light intensity. The current control device requires only one switch to regulate current level, and no other switches for the intensity control. This allows lower parts count for greater reliability and lower system cost.

REFERENCES:
patent: 3755697 (1973-08-01), Miller
patent: 6144222 (2000-11-01), Ho
patent: 6400101 (2002-06-01), Biebl et al.
patent: 7038594 (2006-05-01), Voreis et al.
patent: 2005/0104542 (2005-05-01), Ito et al.

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