Circuit for dimming gas discharge lamps without introducing striations
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United States of America Patent
Stats
-
Mar 19, 1991
Grant Date -
N/A
app pub date -
Dec 22, 1989
filing date -
Dec 22, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dimming circuit provides power from an ac source to a compact fluorescent lamp. The circuit generally includes a resonant circuit driven by a high-frequency switching inverter. The resonant circuit is essentially an ac current source and provides sinusoidal current to the lamp, which loads the resonant circuit in parallel. A small amount of dc current is simutaneously provided to the lamp. The resultant asymmetric current waveform flowing through the lamp substantially eliminates striation over a dimming range from about 100% to 1% of full light output.
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