Driver circuit for led vehicle lamp

Details Driver circuit for led vehicle lamp Driver circuit for led vehicle lamp

H - Electricity

05

B

H05B 37/00 (2006.01) H05B 37/02 (2006.01)

Patent

CA 2536837

A vehicle lamp driver circuit (10 in Fig. 1) for a LED array (11) includes a first LED string (12) in series with a second LED string (14). A LED driver (16) drives the first LED string and a second LED driver (18) 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. When there is reduced input voltage, operation of the LED strings is provided by switching circuits (20, 22) that short-out one LED in each LED string. Another vehicle lamp driver circuit (50 in Fig. 2) includes a first LED string (51) and a second LED string (52) in series with a control switch (56) having a feedback circuit (58) for maintaining constant current regulation to control the sum of the current in each LED string and reduce switching noise.

L'invention concerne un circuit d'attaque pour feu de véhicule, qui comprend une mosaïque de DEL dont le premier chapelet de DEL est couplé en série à un second chapelet de DEL. Une commande de DEL excite le premier chapelet de DEL et une seconde commande de DEL excite le second chapelet de DEL. Dans un mode de fonctionnement comme feu de freinage, le courant transmis aux deux chapelets de DEL est réglé par la commande de DEL couplée en série aux chapelets de DEL. Dans un mode de fonctionnement comme feu arrière, le courant est transmis à un seul chapelet de DEL. Lorsque la tension d'entrée est réduite, les chapelets de DEL sont activés par des circuits de commutation qui court-circuitent une DEL dans chaque chapelet de DEL. Un autre circuit d'attaque pour feu de véhicule comprend un premier chapelet de DEL et un second chapelet de DEL couplés en série à un commutateur de commande comportant un circuit à action en retour destiné à maintenir une régulation de courant constant aux fins de réguler l'intensité cumulée du courant dans chaque chapelet de DEL et de réduire le bruit de commutation.

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