Timed switch for an ac load

Details Timed switch for an ac load Timed switch for an ac load

G - Physics

05

F

315/28, 323/9

G05F 1/44 (2006.01) H03K 17/292 (2006.01) H05B 37/02 (2006.01)

Patent

CA 1156308

T I T L E A TIMED SWITCH FOR AN AC LOAD I N V E N T O R S Alan W. Levy Attila J. Szanto Peter C. Wheeler ABSTRACT OF DISCLOSURE The timed AC switch comprises a mannual on-off switch in series with bidirectional semiconductor switch, such as a triac, for connection in a loop with an AC source and a load which would generally be incandescent ox fluores- cent lamps. The semiconductor switch is driven by an RC oscillator which is under the control of an inhibit circuit and a digital counter which itself is driven by the oscillator. The counter is reset at initial start up, and may also be reset while operating or after counting out. The times switch may also be controlled to inhibit the oscilla- tor for a very short time as a warning before finally timing out.

379634

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