Improving crest factor of electronic ballast-fed fluorescent lampcurrent using pulse frequency modulation
Jooho Song
Joong-Ho Song
Choy, I.
Ju-Yeop Choi
Intelligent Syst. Control Res. Center, Korea Inst. of Sci. & Technol., Seoul;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct 2001
Volume: 48,
Issue: 5
On page(s): 1015-1024
ISSN: 0278-0046
References Cited: 9
CODEN: ITIED6
INSPEC Accession Number: 7070162
Digital Object Identifier: 10.1109/41.954566
Current Version Published: 2002-08-07
Abstract
In case where electronic ballast employing a valley-fill passive
power-factor correction (PFC) circuit is used for feeding fluorescent
tamps, a new method to reduce crest factor of the lamp current is
studied in this paper. It is known that a 50% valley-fill passive PFC
provided for high input power factor results in undesirable value of
crest factor of the fluorescent lamp current, In order to reduce crest
factor to a lower value, a pulse frequency modulation technique based on
the waveform of the DC-link voltage which is predetermined by the
passive PFC circuit is taken into the switching control action of the
electronic ballast. An equation-based analysis between the crest factor
of lamp current and the effect of varying the inverter switching
frequency is comprehensively performed. Several simulation and
experiment results illustrate the Effectiveness of the proposed control
scheme
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