Electronic dimming ballast current sensing scheme
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
Sep 13, 1995
filing date -
Sep 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dimmable fluorescent lamp system embodiment of the present invention comprises a fluorescent lamp with filaments at each end that are continuously heated by independent secondary windings of a transformer. A resonating capacitor is connected in series with a resonating inductor and a pair of DC blocking capacitors are connected from each end of the fluorescent lamp to put it in parallel with the resonating capacitor. A control logic drives the primary winding with a pulse-width or frequency modulated square wave that is controlled by a feedback voltage derived from a pair of rectifiers and a dropping resistor in series with one of the DC blocking capacitors.
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