Led driver with single inverter circuit with isolated...

H - Electricity – 05 – B

Patent

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H05B 33/08 (2006.01)

Patent

CA 2742843

A single-converter circuit--based LED driver circuit (10) with isolated multi-channel outputs is disclosed. The cir-cuit (10) includes an IC control circuit (11), a plurality of isolated output channels (70, 74) each having an output current sensing and conditioning circuit (74, 90), and an output current regulation circuit (128). The out-put current regulation circuit (128) includes a voltage-sensing transformer winding (T4) that senses an output voltage level across a secondary side of the circuit (10), and a peak output current sensing component (156) that senses output currents from the isolated out-put channels and determines which channel has a highest current output. Additionally, the circuit (10) facilitates providing output current regulation when detected output volt-age is below a predetermined threshold, and providing output current regulation when the detected output voltage is above the prede-termined threshold.

L'invention porte sur un circuit d'attaque de DEL à base de circuit convertisseur unique (10) comprenant des sorties multicanal isolées. Le circuit (10) comprend un circuit de commande à circuit intégré (CI) (11), une pluralité de canaux de sortie isolés (70, 74) comprenant chacun un circuit de détection et de conditionnement de courant de sortie (74, 90), et un circuit de régulation de courant de sortie (128). Le circuit de régulation de courant de sortie (128) comprend un enroulement de transformateur de détection de tension (T4) qui détecte un niveau de tension de sortie aux bornes d'un côté secondaire du circuit (10), et un composant de détection de courant de sortie maximal (156) qui détecte des courants de sortie des canaux de sortie isolés et détermine le canal qui a le courant de sortie le plus intense. De plus, le circuit (10) facilite la réalisation d'une régulation de courant de sortie lorsque la tension de sortie détectée est inférieure à un seuil prédéterminé, et la réalisation d'une régulation de courant de sortie lorsque la tension de sortie détectée est supérieure au seuil prédéterminé.

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