Bidirectional converter for high-efficiency fuel cell powertrain

Abbas A. Fardoun, Esam H. Ismail, Ahmad J. Sabzali, Mustafa A. Al-Saffar

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Abstract In this paper, a new wide conversion ratio step-up and step-down converter is presented. The proposed converter is derived from the conventional Single Ended Primary Inductor Converter (SEPIC) topology and it is integrated with a capacitor-diode voltage multiplier, which offers a simple structure, reduced electromagnetic interference (EMI), and reduced semiconductors' voltage stresses. Other advantages include: continuous input and output current, extended step-up and step-down voltage conversion ratio without extreme low or high duty-cycle, simple control circuitry, and near-zero input and output ripple currents compared to other converter topologies. The low charging/discharging current ripple and wide gain features result in a longer life-span and lower cost of the energy storage battery system. In addition, the "near- zero" ripple capability improves the fuel cell durability. Theoretical analysis results obtained with the proposed structure are compared with other bi-direction converter topologies. Simulation and experimental results are presented to verify the performance of the proposed bi-directional converter.

Original languageEnglish
Pages (from-to)470-482
Number of pages13
JournalJournal of Power Sources
Publication statusPublished - 2014


  • Bidirectional DC-DC converter
  • Coupled inductors
  • Keywords
  • SEPIC converter
  • Switched capacitor
  • Switched mode power supplies

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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