Modular converter architecture for medium voltage ultra fast EV charging stations: dual half-bridge-based isolation stage

Michail Vasiladiotis, Behrooz Bahrani, Niklaus Burger, Alfred Rufer

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

10 Citations (Scopus)


The concept of ultra fast charging of Electric Vehicles (EVs) is expected to contribute significantly to their widespread utilization in long-distance travels. Towards this direction, emerging power electronic topologies will be the key components of the developed charging infrastructures. Lately, a novel converter architecture has been proposed for such a purpose. The latter is based on a Cascaded H-Bridge (CHB) converter with integrated battery energy storage systems, which play the role of a buffer in such a power demanding application. This paper is focusing on the isolated DC/DC conversion stage, which is needed for the achievement of the high charging currents. The dual half-bridge (DHB) converter is chosen, which fulfills several requirements for the studied application. The soft switching operation of the converter under wide input-output voltage variations is discussed. Moreover, a current controller is designed, capable of dealing with the topology-specific challenges. Finally, the development of a down-scaled laboratory prototype is described and experimental results are provided.

Original languageEnglish
Title of host publicationProceedings of 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages8
ISBN (Print)9781479927050, 9781479927067
Publication statusPublished - 2014
Externally publishedYes
EventInternational Power Electronics Conference (IPEC-ECCE-ASIA) 2014 - International Conference Center Hiroshima, Hiroshima, Japan
Duration: 18 May 201421 May 2014
Conference number: 7th


ConferenceInternational Power Electronics Conference (IPEC-ECCE-ASIA) 2014
Abbreviated titleIPEC-ECCE-ASIA 2014
Internet address


  • battery energy storage system (BESS)
  • cascaded H-bridge (CHB) converter
  • convex optimization
  • current control
  • DC ultra fast charging
  • dual half-bridge (DHB)
  • isolated DC/DC converter

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