Gas discharge lamp with active crest factor correction

Details Gas discharge lamp with active crest factor correction Gas discharge lamp with active crest factor correction

1997-04-08

1999-04-06

Wong, Don

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315224, 315307, H05B 3702

Patent

active

058923357

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.

REFERENCES:
patent: 4251752 (1981-02-01), Stolz

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