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http://dx.doi.org/10.6113/JPE.2013.13.4.592

New Isolated Single-Phase AC-DC Converter for Universal Input Voltage  

Lee, Ming-Rong (Dept. of Electrical Engineering, Far East University)
Yang, Lung-Sheng (Dept. of Electrical Engineering, Far East University)
Lin, Chia-Ching (Dept. of Electrical Engineering, Far East University)
Publication Information
Journal of Power Electronics / v.13, no.4, 2013 , pp. 592-599 More about this Journal
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 $V_{rms}$) 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.
Keywords
Power factor correction; Discontinuous conduction mode; Universal input voltage;
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Times Cited By KSCI : 2  (Citation Analysis)
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