Electric lamp and discharge devices: systems – Condenser in the supply circuit – Transformer in the condenser load device circuit
Patent
1984-03-28
1985-12-17
Dixon, Harold
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Transformer in the condenser load device circuit
315105, 315240, 315DIG4, H05B 3700
Patent
active
045594791
ABSTRACT:
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.
REFERENCES:
patent: 3274484 (1966-09-01), Gebhardt et al.
patent: 3323013 (1967-05-01), Lord
patent: 3911320 (1975-10-01), Crawford
patent: 4348612 (1982-09-01), Morton
Dixon Harold
Emerson Electric Co.
Markham Charles E.
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