Reverse phase-controlled dimmer

Details Reverse phase-controlled dimmer Reverse phase-controlled dimmer

H - Electricity

05

B

315/70

H05B 39/04 (2006.01) G05F 3/04 (2006.01) H02M 5/293 (2006.01) H05B 39/06 (2006.01)

Patent

CA 1335825

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.

584707

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