Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1999-03-01
2000-04-11
Wong, Don
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315291, 315307, 315224, 315209R, H05B 3702
Patent
active
060491779
ABSTRACT:
An electronic ballast circuit for operating an unlimited number of fluorescent lamps, which provides a high frequency, high open circuit voltage to start almost any fluorescent lamp and a constant current to the lamps once they are started. A single ballast is designed and rated to operate over a power range, simultaneously supplying a number of lamps. The ballast receives 120 VAC or higher voltage, 50 Hz/60 Hz input power, converts the AC input to a high voltage, high frequency sine wave voltage output to fluorescent lamps connected in series or parallel. One or more selected output capacitors provide current limiting to the lamps, which extends their life by reducing stress. The ballast includes a unique starter circuit that is simple, reliable and low in losses as compared with conventional ballasts.
REFERENCES:
patent: 5363020 (1994-11-01), Chen et al.
patent: 5434478 (1995-07-01), Kovalsky et al.
patent: 5466992 (1995-11-01), Nemirow et al.
patent: 5519289 (1996-05-01), Katyl et al.
patent: 5751120 (1998-05-01), Zeitler
Fulham Co. Inc.
Vo Tuyet T.
Wong Don
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