Steady-state analysis and simulation of a BJT self-oscillatingZVS-CV ballast driven by a saturable transformer
Yueh-Ru Yang
Chern-Lin Chen
Dept. of Electr. Eng., Tahwa Inst. of Technol., Hsinchu;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Apr 1999
Volume: 46,
Issue: 2
On page(s): 249-260
ISSN: 0278-0046
References Cited: 31
CODEN: ITIED6
INSPEC Accession Number: 6221676
Digital Object Identifier: 10.1109/41.753763
Current Version Published: 2002-08-06
Abstract
The steady-state oscillation of a zero-voltage-switching
clamped-voltage self-oscillating ballast driven by a saturable
transformer is analyzed and simulated. Its self-oscillating operation is
divided into six stages according to the hysteresis B-H loop of
saturable transformer cores. Stage-wise circuit analysis shows the
saturable transformer limits the lamp current and dominates the
switching frequency of the ballast. The saturating behavior of driving
and switching devices clearly distinguishes this self-oscillating
inverter from an external-drive high-quality-factor resonant inverter.
Analytical results are verified by mathematical simulation and
laboratory experiment
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