Drive circuit for leds, and an associated operating method

H - Electricity – 05 – B

Patent

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H05B 33/08 (2006.01)

Patent

CA 2341657

The invention relates to a control circuit for an LED array, comprising several LED lines, whereby a line consists of several LEDs mounted in series and connected to a supply current (UBatt). A semiconductor switch (Transistor T) is connected in series between the LED and the supply current and makes it possible to supply the LED current in a clocked manner. A measuring shunt (RShunt) for measuring the LED current is connected in series between the LED and the ground, whereby a feedback control circuit regulates the semiconductor switch in such a way that a constant mean value of the LED current is obtained.

L'invention concerne un circuit de commande destiné à un réseau de DEL composé de plusieurs lignes de DEL, une ligne de DEL comportant plusieurs DEL montées en série et reliées à une tension d'alimentation (U¿batt?). Un commutateur à semi-conducteur (Transistor T) est monté en série entre les DEL et la tension d'alimentation, et permet de distribuer le courant de DEL de façon cadencée. Une résistance de mesure R¿Shunt?, destinée à la mesure du courant de DEL, est montée en série entre les DEL et la masse, et un circuit de régulation règle le commutateur à semi-conducteur de manière à obtenir une valeur moyenne constante du courant de DEL.

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