Apparatus and method for providing dimming control of lamps...

Details Apparatus and method for providing dimming control of lamps... Apparatus and method for providing dimming control of lamps...

2004-08-26

2008-08-12

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S194000, C315S2090SC, C315S247000, C315SDIG002

Reexamination Certificate

active

07411359

ABSTRACT:
Dimming of an electrical lamp of the type driven by a ballast is provided by a reactive power device in series between the AC supply and the ballast. The reactive power device provides a variable auxiliary voltage out of phase by 90 or 270 degrees with the current such that a smaller magnitude voltage is applied to the lamp. The dimming device has a switch to enable/disable dimming. When the switch is enabled, the voltage applied to the lamp is controlled by a half-bridge inverter with a pair of totem pole power electronic switches, along with a pair of DC series capacitors and a low-pass filter.

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