A Novel Half-Bridge Asymmetrical ZCS-PWM DC-DC Converter with High Frequency-Link

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  • Mishima Tomokazu
    Dept. of Electrical Engineering & Information Science, Kure College of Technology
  • Hiraki Eiji
    Graduate School of Science & Engineering, Yamaguchi University
  • Tanaka Toshihiko
    Graduate School of Science & Engineering, Yamaguchi University
  • Nakaoka Mutsuo
    Electric Energy Saving Research Center, Kyugnam University

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A novel zero current soft-switching (ZCS)-PWM cell-assisted half-bridge DC-DC converter topology with a high frequency link is proposed in this paper. The newly-proposed DC-DC converter consists of a PWM-controlled single-ended half-bridge high frequency (HF) inverter and a current doubler rectifier linked with a HF transformer. In order to attain the wide range of ZCS-PWM operation in the primary-side HF inverter, an active edge resonant snubber cell composed by a switched capacitor and a lossless inductor is adopted in the half-bridge leg, providing ZCS commutation for a wide range of output power. The operation characteristics of the DC-DC converter proposed here are described, and its feasibility data is demonstrated and evaluated with simulation and experimental results.

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