Non-toxic photo cells and photosensors including the same

H - Electricity – 05 – B

Patent

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Details

H05B 37/02 (2006.01)

Patent

CA 2715374

Photo control devices include a housing having a light transmissive portion. A photosensor is positioned in the housing to receive light passing through the light transmissive portion of the housing. A relay electrically coupled to the photosensor is responsive to a level of light de-tected by the photosensor. The photosensor includes a light sensitive sili-con photo cell and an electronic circuit. The electronic circuit is coupled to the silicon photo cell and the relay and includes a field effect transistor (FET) including a zener diode therein between a source and a drain of the FET. The silicon photo cell may be a photodiode and/or a phototransitor. The relay may be a thermal switch including a heater resistor.

La présente invention concerne des dispositifs de commande photoélectrique qui contiennent un logement ayant une partie transmettant la lumière. Un photodétecteur est placé dans le logement de manière à recevoir la lumière passant par la partie transmettant la lumière du logement. Un relais électriquement couplé au photodétecteur répond à un niveau de lumière détecté par le photodétecteur. Le photodétecteur comprend une cellule photoélectrique en silicium sensible à la lumière, ainsi qu'un circuit électronique. Le circuit électronique est couplé à la cellule photoélectrique en silicium et au relais et comprend un transistor à effet de champ (TEC) comprenant une diode Zener, entre une source et un drain du TEC. La cellule photoélectrique en silicium peut être une photodiode ou un phototransistor. Le relais peut être un commutateur thermique comprenant une résistance de chauffage.

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