Electronic dimming ballast current sensing scheme

Details Electronic dimming ballast current sensing scheme Electronic dimming ballast current sensing scheme

1995-09-13

1997-03-18

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315224, 315200R, 315205, 315DIG4, 315DIG5, 315DIG7, G05F 100

Patent

active

056125950

ABSTRACT:
A dimmable fluorescent lamp system embodiment of the present invention comprises a fluorescent lamp with filaments at each end that are continuously heated by independent secondary windings of a transformer. A resonating capacitor is connected in series with a resonating inductor and a pair of DC blocking capacitors are connected from each end of the fluorescent lamp to put it in parallel with the resonating capacitor. A control logic drives the primary winding with a pulse-width or frequency modulated square wave that is controlled by a feedback voltage derived from a pair of rectifiers and a dropping resistor in series with one of the DC blocking capacitors.

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A. Okuda, "Development of an Elecytronic Dimming Ballast . . . ", Journal of Ill. Eng. Soc., Winter 1992.

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