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http://dx.doi.org/10.6113/TKPE.2012.17.3.230

Active-Clamp AC-DC Converter with Direct Power Conversion  

Cho, Yong-Won (Division of Electrical Eng., Pohang Univ. of science and technology)
Kwon, Bong-Hwan (Division of Electrical Eng., Pohang Univ. of science and technology)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.17, no.3, 2012 , pp. 230-237 More about this Journal
Abstract
This paper proposes an active-clamp ac-dc converter with direct power conversion that has a simple structure and achieves high efficiency. The proposed converter is derived by integrating the step-down ac chopper and the output-voltage doubler. The proposed converter provides direct ac-dc conversion and dc output voltage without using any full-bridge diode rectifier. The step-down ac chopper using an active-clamp mechanism serves to clamp the voltage spike across the main switches and provides zero-voltage turn-on switching. The resonant-current path formed by the leakage inductance of the transformer and the resonant capacitor of the output-voltage doubler achieves the zero-current turn-off switching of the output diodes. The operation principle of the converter is analyzed and verified. A 500W prototype is implemented to show the performance of the proposed converter. The prototype provides maximum efficiency of 95.1% at the full load.
Keywords
active-clamp circuit; zero-voltage switching; zero-current switching;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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