Enhanced trim resolution voltage-controlled dimming led...

H - Electricity – 05 – B

Patent

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Details

H05B 37/00 (2006.01) H05B 37/02 (2006.01) B60R 16/02 (2006.01)

Patent

CA 2721714

Each driver circuit 300 for a six-by-four array 200 of light emitting diodes illuminating a pushbutton switch 100 switches three pairs of the light emitting diodes D1-D2, D3-D4 and D5-D6 between series connection and parallel connection based on changes to an applied input voltage. Driving six light emitting diodes instead of only four allows illumination of a larger area and improves power efficiency at higher applied input voltages, while retaining dimming compatibility at low voltage levels. Each driver circuit also includes a rectifier D12-D15 allow illumination of the pushbutton switch with direct current voltages of either polarity. The quiescent current limiting resistance is split into multiple resistors R3-R5 for further improved power efficiency.

Chaque circuit conducteur 300 pour un réseau de six par quatre 200 de diodes électroluminescentes éclairant un interrupteur à bouton-poussoir 100 commute trois paires des diodes électroluminescentes D1-D2, D3-D4 et D5-D6 entre une connexion série et une connexion parallèle en fonction de changements apportés à une tension dentrée appliquée. Lentraînement de six diodes électroluminescentes au lieu de seulement quatre permet léclairage dune plus grande zone et améliore le rendement de puissance à des tensions dentrée appliquées supérieures, tout en conservant une compatibilité de gradation à de faibles niveaux de tension. Chaque circuit conducteur comprend également un redresseur D12-D15 qui permet léclairage de linterrupteur à bouton-poussoir avec des tensions de courant continu de lune ou lautre polarité. La résistance de limitation de courant de repos est divisée en de multiples résistances R3-R5 pour un rendement de puissance davantage amélioré.

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