Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1983-11-03
1986-02-04
Moore, David K.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315194, 315195, 315244, 315DIG4, H05B 4138, H05B 41392
Patent
active
045688575
ABSTRACT:
A dimming system for fluorescent tubes wherein counter electromotive forces generated during switch off of the tubes are used to maintain filaments of the fluorescent tubes heated during switch off periods of the tube, the dimming system having source terminals for connection to a source of power, the power having zero phases, load terminals for connection to the fluorescent tubes, a switch connected to the source terminals and to the load terminals for controlling the supply of power to the load terminals, a zero phase firing circuit connected to the switch for energizing the switch to supply power to the load terminals at the zero phases, a phase turn off circuit connected to the switch for deenergizing the switch to switch off power to the load terminals at phases of the power other than the zero phases, and a switch off filament heating control circuit connected to the switch for converting counter electromotive forces generated at switch off of the tube into power for supply to the filaments during switch off.
REFERENCES:
patent: 2429415 (1947-10-01), Lemmers
patent: 3529207 (1970-09-01), Webb
patent: 4352045 (1982-09-01), Widmayer
patent: 4371812 (1983-02-01), Widmayer
patent: 4464610 (1984-08-01), Pitel
Burkhart et al., "Reverse Phase Controlled Dimmer for Incandescent Lighting", IEEE Trans. on Industry Applications, vol. I-A 15, No. 5, Sep. 1979, pp. 579-583.
Ernst et al., "Illumination Control Circuit", IBM Technical Disclosure Bulletin, vol. 20, No. 12, May 1978, pp. 5132-5133.
DeLuca Vincent
Honeywell Ltd.
Joike Trevor B.
Moore David K.
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