Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1987-12-16
1991-08-06
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315194, 315307, 315DIG4, 323243, 323326, H05B 3702, G05F 144
Patent
active
050380818
ABSTRACT:
Reverse phase-controlled dimming of an a.c.-powered load is accomplished by switching power to the load on and off during each half cycle. In one embodiment of the present invention, power is switched on when line voltage is substantially equal to load voltage and off at a selected time later in the half cycle or at any time that the voltage across the switch exceeds a predetermined value. Preferably, switching is accomplished with a pair of field effect transistors. The load preferably includes a capacitor from load hot to neutral. The present circuit permits quiet dimming of incandescent lamp loads without the need for complex circuitry. It is particularly well adapted for dimming low voltage lamps using a solid state transformer.
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Hausman Donald F.
Maiale, Jr. Nicholas F.
LaRoche Eugene R.
Lutron Electronics Co. Inc.
Shingleton M.
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