Power supply circuit for gas discharge lamps operating at a resonant frequency
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United States of America Patent
Stats
-
Mar 29, 1994
Grant Date -
N/A
app pub date -
Aug 12, 1992
filing date -
Aug 27, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power supply circuit for any kind of loads or power consuming devices which are connected to an electrical power supply; especially lamps, such as at least one glow or gas discharge lamp, wherein a pulse width modulator controls electronic switches of a push-pull oscillator, and wherein the pulse frequency of the pulse width modulator is tuned to the resonant frequency of a resonant transformer of the push-pull oscillator which has the secondary side thereof connected to the gas discharge lamp. A control circuit monitors a current and/or voltage value and/or time value which is characteristic for the presence of the resonance and which, upon a change in the resonant frequency, will change the pulse frequency of the pulse width modulator to ensure operation at the new resonant frequency.
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