Electric lamp and discharge devices: systems – Regulation of the control current and/or potential applied... – Plural load device systems
Patent
1993-05-11
1994-06-21
Pascal, Robert J.
Electric lamp and discharge devices: systems
Regulation of the control current and/or potential applied...
Plural load device systems
315198, 315199, 315291, 315DIG4, G05F 100
Patent
active
053230884
ABSTRACT:
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.
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Esakoff Gregory
Pascal Robert J.
Philogene Haissa
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