G - Physics
05
F
323/10, 342/12,
G05F 1/455 (2006.01) H03K 17/13 (2006.01)
Patent
CA 1288811
ABSTRACT A device for regulating delivery of power from an AC voltage source to a load such as a lamp, a motor, a heating element or the like is described. Electronic circuitry responsive to the AC voltage generates a periodic signal whose magnitude indicates the instantaneous phase angle of the AC voltage relative to the most recent zero crossover of the AC voltage throughout the entirety of each half cycle of operation. A comparator generates a triggering signal when the phase angle signal corresponds to a threshold signal which may be manually set by adjustment of a voltage divider or which may be generated by a sensor in response to a predetermined condition, such as ambient light level or temperature, which is to be regulated by appropriate delivery of power to the load. The triggering signal is applied to a triac series connected with the load to initiate conduction of load current. The device permits the phase angle at which current conduction is initiated in each half cycle of operation to be controlled over substantially the full range of zero to 180 degrees.
513356
Doric Electronic Laboratories Ltd.
Heenan Blaikie Llp
Pelonis Kosta
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