High-Voltage-Gain Soft-Switching Converter Employing Bidirectional Switch for Fuel-Cell Vehicles

Nam Gyeong Kim, Byeongcheol Han, Seung Won Jo, Minsung Kim

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Conventional current-fed resonant converter suffers from high turn-off loss over wide range of fuel-cell voltage. To alleviate this problem, we propose high voltage gain current-fed resonant converter that achieves almost ZVS turn-off over a wide range of voltage gain. By employing a bidirectional switch across center nodes of the voltage doubler and corresponding modulation, the presented converter achieved almost ZVS at the turn-off instant; this trait significantly increases the power conversion efficiency even under high frequency operation. The inherent boost function of the current doubler, an additional boosting operation using a bidirectional switch, and double boosting of the voltage doubler enable the presented converter to achieve high voltage gain without having to use a transformer that has a high turns-ratio. Moreover, 180 phase interleaving reduces the input current ripple to zero. The steady-state operation is analyzed comprehensively, and design considerations of the proposed converter are given. Finally, a prototype with input of 48-72 V, output of 380 V, and rated power of 1 kW is developed to validate the effectiveness and feasibility of the proposed converter.

Original languageEnglish
Pages (from-to)8731-8743
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Volume70
Issue number9
DOIs
StatePublished - Sep 2021

Keywords

  • current-fed
  • life time
  • Switching loss
  • wide voltage range
  • zero ripple

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