Fluorescent lamp dimming over large light output range

Details Fluorescent lamp dimming over large light output range Fluorescent lamp dimming over large light output range

1986-09-26

1988-04-19

Moore, David K.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural cathode and/or anode discharge device load

315334, 315336, 315DIG1, 315DIG4, 315276, 315264, 315202, 313602, 313581, H05B 4129, H05B 3700, H05B 4124

Patent

active

047392274

ABSTRACT:
A fluorescent lamp has an envelope tube forming a gas-tight enclosure about a pair of externally-energizable filaments which generate a plasma discharge for conversion to visible light; a keep-alive electrode is located adjacent to at least one filament. A dimming control circuit individually externally energizes each keep-alive electrode to generate an auxiliary discharge, between that keep-alive electrode and the adjacent filament, at a magnitude sufficient to maintain the adjacent filament in the spot mode of operation even if the main plasma discharge current is varied over a range sufficient to change the visible light output of the lamp over at least a 10:1 range.

REFERENCES:
patent: 2843805 (1958-07-01), Brodersen
patent: 3611024 (1971-10-01), Nakatsu et al.
patent: 4383197 (1983-05-01), Gungle et al.

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