Frequency shift inverter for variable power control
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United States of America Patent
Stats
-
Aug 24, 1982
Grant Date -
N/A
app pub date -
Aug 14, 1980
filing date -
Aug 14, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable frequency AC power source drives a gas discharge lamp which is connected in parallel with the capacitance of a series resonant circuit. The polarity of the voltage applied to the resonant circuit is commutated at such times as the rate-of-change of current flow in the resonant circuit is below an adjustable threshold value. The setting of a threshold adjusting circuit determines the brightness of the lamp. The polarity is also commutated at such times as the current flow from the source reaches a predetermined level. Lamp current is thus independently and variably controlled in the variable power mode.
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