Efficient Multi-Port Bidirectional Converter with Soft-Switching Capability for Electric Vehicle Applications

Rasoul Faraji, Lei Ding, Tohid Rahimi, Hosein Farzanehfard, Hossein Hafezi, Mohammad Maghsoudi

Research output: Contribution to journalArticleScientificpeer-review

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In this paper, to solve the hard-switching operation problem and the lack of existing a bidirectional power flow path from output to the energy storage device of the conventional three-port converter, a new soft-switched bidirectional multi-port converter is proposed. A large number of switches, different power flow paths which vary in each operating mode, and changing the outputs and their power levels are some of the challenges to provide soft-switching conditions in multi-port converters. In the proposed converter, by changing the topology of the conventional three-port converter, the bidirectional power exchangeability between ports is provided. Moreover, a soft-switching cell is added, which can operate independently from the output power levels. Less number of components with low volume is one of the important features of this multi-port converter. Due to the soft-switching operation of the proposed converter, the size of passive components and heat-sink is reduced. In addition, by the use of coupled inductors in the soft-switching cell, only one magnetic core is used and thus, single-stage power conversion is achieved and conduction loss is reduced. In this paper, the converter operating modes are presented, and design considerations are discussed. Finally, a 200 W-200 V prototype is implemented, and the theoretical analysis is validated by the experimental results.

Original languageEnglish
Pages (from-to)107079-107094
Number of pages16
JournalIEEE Access
Publication statusPublished - 2021
Publication typeA1 Journal article-refereed


  • dc-dc converter
  • electric vehicle
  • hybrid power systems
  • Multi-port converter
  • soft-switching

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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