Resonant inverter for hot cathode fluorescent lamps
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United States of America Patent
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-
Oct 20, 1998
Grant Date -
N/A
app pub date -
Sep 25, 1996
filing date -
Sep 25, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluorescent lamp drive circuit is disclosed. The fluorescent lamp drive circuit includes first filament drive circuitry coupled to the filaments of the lamp for driving the fluorescent lamp with a first waveform having sufficient amplitude such that gases in the fluorescent lamp are not allowed to extinguish during a prolonged period of operation. The fluorescent lamp drive circuit also includes second filament drive circuitry coupled to the filaments of the lamp for adjustably driving the fluorescent lamp with a second waveform during the prolonged period of operation. The second waveform has an amplitude which is adjustable over a wide range of voltages to achieve a wide range of fluorescent lamp luminance levels. Synchronization circuitry provides an input to the second filament drive circuitry to automatically facilitate the efficient transfer of power from the second filament drive circuitry to the fluorescent lamp over a wide range of lamp pressures and operating temperatures.
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