Single fluorescent lamp ballast for simultaneous operation of different lamps in series or parallel
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United States of America Patent
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Apr 11, 2000
Grant Date -
N/A
app pub date -
Mar 1, 1999
filing date -
Mar 1, 1999
priority date (Note) -
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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.
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