H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 33/08 (2006.01)
Patent
CA 2459968
To prevent inadvertent illumination of a light emitting diode L1 (or set of light emitting diodes 201a-201b) by stray currents at extremely low levels, a quiescent current limiting resistive load R1 is connected in parallel with the light emitting diode L1, sized to conduct a desired minimum current at the lowest forward voltage drop at which the light emitting diode L1 is expected to properly illuminate. Rather than connecting the resistive load R1 across the input/output ports 204a-204b of the driver circuit 200, in parallel with any biasing resistance R2 and the light emitting diodes 201a-201b, the load R1 is connected directly in parallel with the light emitting diodes 201a-201b. Additional current through the load R1 as the voltage across the input/output ports 204a-204b increases is thus effectively capped by the maximum forward voltage drop across the light emitting diodes 201a-201b.
Afin d'éviter l'allumage intempestif d'une diode électroluminescente (L1) (ou d'un ensemble de diodes électroluminescentes (201a-201b)) par des courants vagabonds de niveaux extrêmement faibles, une charge résistive de limitation de courant de repos (R1) est connectée en parallèle de la diode électroluminescente (L1) et est conçue pour conduire un courant minimum désiré à la chute de tension directe la plus faible à laquelle la diode électroluminescente (L1) est susceptible de véritablement s'allumer. Plutôt que de connecter la charge résistive (R1) aux bornes d'entrée/sortie (204a-204b) du circuit pilote (200), en parallèle de toute résistance de polarisation (R2) et des diodes électroluminescentes (201a-201b), la charge (R1) est connectée directement en parallèle des diodes électroluminescentes (201a-201b). Un courant supplémentaire traversant la charge (R1) lorsque la tension entre les bornes d'entrée/sortie (204a-204b) augmente, est ainsi bloqué d'une manière efficace par la chute de tension directe maximale à travers les diodes électroluminescentes (201a-201b).
Coley Craig J.
Guthrie Don W.
Aerospace Optics Inc.
Blake Cassels & Graydon Llp
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