H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/42, 315/69
H05B 39/00 (2006.01) H05B 37/02 (2006.01) H05B 41/16 (2006.01)
Patent
CA 1264351
INVENTION: CONTROLLING LIGHTING ELEMENTS IN RESPONSE TO AMBIENT LIGHT INTENSITY INVENTOR: KOSTA PELONIS ABSTRACT OF THE DISCLOSURE A two-terminal device is described which can be series connected with an incandescent or fluorescent lighting element to turn the lighting element on and off in response to ambient light intensity. The device includes a triac which conducts current through the lighting element, a diac connected to the trigger terminal of the triac to set a turn-on voltage threshold, and a capacitive voltage divider whose divider node is connected to the diac and which normally generates from the voltage across the triac a triggering signal that initiates triac conduction. A photoresistive element shunts one of the divider capacitors and suppresses triac triggering when ambient light intensity exceed a predetermined level. A neon light adjacent the photoresistive element and powered by the voltage difference across the triac prevents off-on oscillation in response to light received from the lighting element itself.
494806
Pelonis Kosta
Waraksa Mirek A.
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