Starting and dimming circuit for fluorescent lamps

H - Electricity – 05 – B

Patent

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315/31

H05B 41/38 (2006.01) H05B 41/16 (2006.01) H05B 41/232 (2006.01) H05B 41/40 (2006.01)

Patent

CA 1209195

Abstract of Disclosure. A rapid start circuit for starting and step dimming a fluorescent lamp includes a voltage step up auto transformer and lamp filaments for starting, ballast and a pair of capacitors having different values variously connected in series with the lamp and ballast by a rotary switch; first in parallel, then individually and then in series to achieve a progressively stepped dimming of the lamp. A second form of the invention includes a first capacitor in series with the lamp and ballast for reducing the maximum light output of the lamp and a plurality of capacitors each having a different value selectively connected in parallel with the first capacitor by a slide switch to selectively dim the lamp; and a resistor in series with the first capacitor to diminish arcing and noise when switching. Both forms of the invention include a pair of secondary windings for maintaining filament voltage.

477598

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