Operation Evaluation of the Symmetric Switched-Capacitor Snubbers-assisted ZCS Bidirectional DC-DC Converter

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  • Mishima Tomokazu
    Dept. of Electrical Engineering & Information Science, Kure College of Technology Japan Institute of Power Electronics
  • Hiraki Eiji
    Dept. of Electrical & Electronics Eng., Yamaguchi University Japan Institute of Power Electronics
  • Tanaka Toshihiko
    Dept. of Electrical & Electronics Eng., Yamaguchi University
  • Nakaoka Mutsuo
    The Electric Energy Saving Research Center, The Graduate School of Engineering, Kyungnam University Japan Institute of Power Electronics

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  • 対称形ロスレススイッチトキャパシタスナバ方式ZCS双方向DC-DCコンバータ動作評価
  • タイショウケイ ロスレス スイッチト キャパシタスナバ ホウシキ ZCS ソウホウコウ DC DC コンバータ ドウサ ヒョウカ

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Abstract

A new type of soft switched bidirectional DC-DC converter for advanced automotive electric power systems is presented in this paper. This converter consists of dual half-bridge circuits linked with a high frequency transformer, which is applicable as an interface between a high-voltage DC bus line and a low-voltage power source such as Supercapacitor. In order to reduce the switching losses and expand the soft switching range, a newly developed two-lossless switched capacitor snubber-assisted Zero Current Switching (ZCS) are applied to the primary side circuit. By using this ZCS scheme, the soft switching operation can be achieved for the wide range of output power. The converter operation is demonstrated with simulation results, and its feasibility is verified with experimental results using its 1.0kW 25kHz prototype system.

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