Gas discharge lamp with active crest factor correction
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Apr 8, 1997
filing date -
Apr 8, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A new circuit for the operation of gas discharge lamps via a converter that operates directly off the rectified AC line without reactive filtering and consequently maintains good power factor and low total harmonic distortion while still maintaining an acceptable lamp current crest factor. The converter employs active crest factor correction to control the actual lamp current to a determined peak to RMS value. The design comprises two stages: a first stage with a non-linear input voltage to lamp current transfer function and a second stage having a frequency modulation to lamp current transfer function designed to cancel the first stage's transfer function at a predetermined input voltage and thus maintain constant lamp current during the correction interval.
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