Driver circuit for LED vehicle lamp

Details Driver circuit for LED vehicle lamp Driver circuit for LED vehicle lamp

2006-05-09

2006-05-09

Chen, Shih-Chao (Department: 2821)

Electric lamp and discharge devices: systems

Plural series connected load devices

Christmas lights

C315S224000, C315S244000, C315S291000, C315S186000, C315S192000, C315S242000, C315S2090SC

Reexamination Certificate

active

07042165

ABSTRACT:
A first vehicle lamp driver circuit for a light emitting diode (LED) array, the LED array having a first string of four LEDs in series and a second string of four LEDs in series. A first LED driver drives the first LED string and a second LED driver drives the second LED string. In a STOP mode of operation, the current to both LED strings is controlled by the LED driver in series with the LED string. In a TAIL mode of operation, the current is provided to only one LED string via a series connected diode and resistor. When there is reduced input voltage, operation of the LED strings is provided by switching circuits that short-out one LED in each LED string. A second vehicle lamp driver circuit comprises a first LED string and a second LED string in series with a control switch having a feedback circuit for maintaining constant current regulation to control the sum of the current in each LED string and reduce switching noise.

REFERENCES:
patent: 5742133 (1998-04-01), Wilhelm et al.
patent: 6362578 (2002-03-01), Swanson et al.
patent: 6586890 (2003-07-01), Min et al.
patent: 6836081 (2004-12-01), Swanson et al.
patent: 6853150 (2005-02-01), Clauberg et al.

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