Drive circuit for leds and an associated operating method

Details Drive circuit for leds and an associated operating method Drive circuit for leds and an associated operating method

H - Electricity

05

B

H05B 33/08 (2006.01) B60Q 1/26 (2006.01)

Patent

CA 2354473

The invention relates to a control circuit for a LED array. The inventive circuit consists of at least two lines of LEDs, whereby a line consists of several LEDs mounted in series and connected to a distribution voltage (UBatt). A semiconductor switch (T) is connected in series between each LED line and the corresponding distribution voltage and enables to supply the LED current in a clocked manner. A measuring shunt (RShunt) is connected in series in relation to the LEDs and in the branch for the conducting-state current (IF) and between the LEDs and the ground. A control circuit controls the semiconductor switch (T) of a first LED line, hereafter referred to as master line, in such a way that a constant mean value of the LED current is obtained, whereby the master line is provided with a given number X of LEDs in the line thereof. Said control circuit also controls at least the semiconductor switch (T2) of an additional LED line (slave line).

L'invention concerne un circuit de commande pour un ensemble de DEL qui est constitué d'au moins deux lignes de DEL, une ligne étant constituée de plusieurs DEL montées en série qui sont raccordées à une tension d'alimentation (U¿Batt?). Entre chaque ligne de DEL et la source de tension d'alimentation correspondante, un commutateur à semi-conducteur (T) est monté en série, lequel permet l'amenée du courant de DEL de manière cadencée. Une résistance de mesure (R¿Shunt?) est montée en série par rapport aux DEL, dans la branche destinée au courant à l'état passant (I¿F?), entre les DEL et la masse. Un circuit de régulation régule le commutateur à semi-conducteur (T) d'une première ligne de DEL, appelée ligne maîtresse, de telle sorte qu'une valeur moyenne constante du courant de DEL est obtenue, la ligne maîtresse présentant un nombre prédéterminé X de DEL et ledit circuit de régulation commandant également au moins le commutateur à semi-conducteur (T2) d'une autre ligne de DEL, appelée ligne esclave.

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