LEDS driver

Details LEDS driver LEDS driver

2007-08-28

2007-08-28

Dinh, Trinh Vo (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S290000

Reexamination Certificate

active

10539981

ABSTRACT:
The power supply (20) for LEDs provides power to a LED light source (10) having a variable number of LEDs wired in series and/or in parallel. The power supply (20) uses current and voltage feedback to adjust power to the LEDs and provides protection to the LED light source (10). A feedback controller (27) compares sensed current and sensed voltage to a reference signal and generates a feedback signal, which is processed by a power factor corrector (124) to adjust the current flow through the transformer supplying current to the LEDs. A LED control switch (24) clamps a peak of the current to the LEDs to provide further protection to the LED light source (10). A short/open detection circuit (30) indicates any detection of a “LED outage” of the LED light source (10).

REFERENCES:
patent: 4496939 (1985-01-01), Moberg
patent: 6500101 (2002-12-01), Chen
patent: 6577072 (2003-06-01), Saito et al.
patent: 2002/0158590 (2002-10-01), Saito et al.
patent: 2004/0032754 (2004-02-01), Yang
patent: 2006/0012349 (2006-01-01), Allen
patent: WO02/069839 (2002-09-01), None
Datasheet: “LT1932—Constant-Current DC/DC LED DRiver in Thin SOT”, 2001, LInear Technology, pp. 1-16.

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