H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/02 (2006.01) H02M 5/257 (2006.01) H05B 39/08 (2006.01)
Patent
CA 2116128
2116128 9306700 PCTABS00021 A dimming control circuit for a plurality of lighting fixtures includes a separate semiconductor power switch, e.g., a silicon-controlled rectifier or SCR, for providing controlled amounts of pulsed, unidirectional electrical current to each lighting fixture. In one embodiment, a pair of SCRs, arranged in parallel, opposed relationship, are controllably pulsed to produce an alternating sequence of positive and negative electrical current pulses, of independently-controlled duration, and oppositely-conducting diodes then connect these SCRs to two separate lighting fixture. One such lighting fixture thus receives the positive current pulses, and the other such lighting fixture thus receives the negative current pulses. In an alternative embodiment, each lighting fixture receives pulsed, unidirectional current directly from a separate, independently-controlled SCR.
Cunningham David W.
Gowling Lafleur Henderson Llp
LandOfFree
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