New Isolated Single-Phase AC-DC Converter for
Universal Input Voltage
Ming-Rong Lee*, Lung-Sheng Yang†, and Chia-Ching Lin*
*†Dept. of Electrical Engineering, Far East University, Tainan City, Taiwan
Abstract
This paper investigates a new isolated single-phase AC-DC converter, which integrates a modified AC-DC buck-boost
converter with a DC-DC forward converter. The front semi-stage is operated in discontinuous conduction mode (DCM) to
achieve an almost unity power factor and a low total harmonic distortion of the input current. The rear semi-stage is used for
step-down voltage conversion and electrical isolation. The front semi-stage uses a coupled inductor with the same winding-turn
in the primary and secondary sides, which is charged in series during the switch-on period and is discharged in parallel during the
switch-off period. The discharging time can be shortened. In other words, the duty ratio can be extended. This semi-stage can be
operated in a larger duty-ratio range than the conventional AC-DC buck-boost converter for DCM operation. Therefore, the
proposed converter is suitable for universal input voltage (90~264 Vrms) and a wide output-power range. Moreover, the voltage
stress on the DC-link capacitor is low. Finally, a prototype circuit is implemented to verify the performance of the proposed
converter.
LINK
http://jpe.or.kr/archives/view_articles.asp?seq=760
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