Timed photocell switch circuit

H - Electricity – 03 – K

Patent

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Details

H03K 17/94 (2006.01) G04C 23/38 (2006.01) H01H 43/00 (2006.01) H05B 37/02 (2006.01)

Patent

CA 2205427

A timed photocell switching circuit is disclosed which senses a light-to-dark transition and applies power to a lamp load for a preset period of time. After the preset period has expired the timed photocell circuit turns the lamp load off for the remainder of the night until a dark-to-light transition resets the circuit after which it can be triggered for another timing cycle. Once the light-to-dark transition triggers the timing cycle the ambient light level cannot disrupt the circuit. In addition, the circuit can be reset regardless of its timing position by momentarily cycling power to the circuit.

L'invention est un circuit de commutation temporisé à cellule photoélectrique qui détecte les transitions entre la clarté et l'obscurité et met une lampe sous tension pour une période prédéterminée. Après l'expiration de cette période, le circuit temporisé de l'invention éteint la lampe pour le reste de la nuit jusqu'à ce qu'une transition entre l'obscurité et la clarté le réarme, après quoi il peut être déclenché pour un autre cycle de minuterie. Quand la transition de la clarté à l'obscurité déclenche le cycle de minuterie, le niveau de la lumière ambiante ne peut perturber le circuit. De plus, on peut réarmer celui-ci à tout instant en le mettant momentanément sous tension.

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