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http://dx.doi.org/10.6113/JPE.2016.16.3.894

Analysis, Design, and Implementation of a Soft-Switched Active-Clamped Forward Converter with a Current-Doubler Rectifier  

Jang, Paul (Department of Electrical and Computer Engineering, Seoul National University)
Kim, Hye-Jin (Department of Electrical and Computer Engineering, Seoul National University)
Cho, Bo-Hyung (Department of Electrical and Computer Engineering, Seoul National University)
Publication Information
Journal of Power Electronics / v.16, no.3, 2016 , pp. 894-904 More about this Journal
Abstract
This study examines the zero-voltage switching (ZVS) operation of an active-clamped forward converter (ACFC) with a current-doubler rectifier (CDR). The ZVS condition can be obtained with a much smaller leakage inductance compared to that of a conventional ACFC. Due to the significantly reduced leakage inductance, the design is optimized and the circulating loss is reduced. The operation of the ACFC with a CDR is analyzed, and a detailed ZVS analysis is conducted on the basis of a steady-state analysis. From the results, a design consideration for ZVS improvement is presented. Loss analyses of the converters shows that enhanced soft-switching contributes to an efficiency improvement under light-load condition. Experimental results from a 100-W (5-V/20-A) prototype verify that the ACFC with a CDR can attain ZVS across an extended load range of loads and achieve a higher efficiency than conventional ACFCs.
Keywords
Active-clamp circuit; Current-doubler rectifier; Forward converter; Zero-voltage switching;
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