Electric lamp and discharge devices: systems – Time-controlled
Patent
1994-09-29
1996-07-23
Gonzalez, Frank
Electric lamp and discharge devices: systems
Time-controlled
315DIG4, 315307, H05B 3702
Patent
active
055392849
ABSTRACT:
A dimming control circuit for connection to a nondimming ballast in a fluorescent lighting system is disclosed herein. The control circuit is switchably connected to a source of AC voltage within the lighting system, while the ballast includes terminals for connecting to a fluorescent lamp. A power control module within the control circuit is operative to conduct a controllable portion of the voltage waveform provided by the source of AC voltage to the ballast in accordance with a brightness control signal received by a phase control circuit. A turn-on module, operatively coupled to the power control module, operates to shunt current from the phase control circuit during a turn-on interval commencing upon connection of the dimming control circuit to the source of AC voltage in order that substantially the entire voltage waveform is provided to the ballast during the turn-on interval.
REFERENCES:
patent: 4950963 (1990-08-01), Sievers
Philips Guide to Fluorescent Lamps.
Advanced Ballasts Data Sheet.
Sylvania GTE Engineering Bulletin 0-341.
Gonzalez Frank
Hybrinetics, Inc.
Ratliff Reginald A.
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