Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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A High-Efficiency High-Power Step-Up Converter with Low Ripple Content

  • Kang Jeong-il (Department of Electrical Engineering Korea Advanced Institute of Science and Technology) ;
  • Roh Chung-Wook (Samsung Electronics Co., LTD) ;
  • Moon Gun-Woo (Department of Electrical Engineering Korea Advanced Institute of Science and Technology) ;
  • Youn Myung-Joong (Department of Electrical Engineering Korea Advanced Institute of Science and Technology)
  • Published : 2001.10.01
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Abstract

A new phase-shifted parallel-input/series-output (PI SO) dual inductor-fed push-pull converter for high-power step­up applications is proposed. This converter is operated at a constant duty cycle and employs an auxiliary circuit to control the output voltage with a phase-shift between the two modules. It features a voltage conversion characteristic which is linear to changes in the control input, and high step-up ratio with a greatly reduced switch turn-off stress resulting in a significant increase in the converter efficiency. It also shows a low ripple content and low root-mean-square (RMS) current in the output capacitor. The operational principle is analyzed and a comparative analysis with the conventional pulse-width-modulated (PWM) PISO dual inductor-fed push-pull converter is presented. A 50kHz, 800W, 350Vdc prototype with an input of 20-32Vdc has also been constructed to validate the proposed converter. The proposed converter compares favorably with the conventional counterpart and is considered well suited to high-power step-up applications.

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