Downsizing Effects of Integrated Magnetic Components in High Power Density DC-DC Converters for EV and HEV Applications

Shota Kimura, Yuki Itoh, Wilmar Martinez , Masayoshi Yamamoto, Jun Imaoka

Research output: Contribution to journalArticleScientificpeer-review

49 Citations (Scopus)


Interleaved dc-dc converters with integrated magnetic components capable to achieve high power density have recently gained attention in automotive applications for eco-friendly transportation. These circuits may contribute to the downsizing of powertrains for electric vehicles (EVs) and hybrid electric vehicles (HEVs) using close-coupled inductors (CCIs) and loosely coupled inductors (LCIs). In this study, a novel core model for size and loss calculation of the interleaved converter with integrated winding coupled inductors (IWCIs) is proposed to assess the size of magnetic components. This assessment was carried out using the parameters of a 1-kW circuit. As a result, interleaved converters with IWCIs proved to be more effective than the converters with LCIs and CCIs for downsizing the magnetic components. In contrast, it was also found that the interleaved converter with LCIs achieved downsizing of the magnetic component at a duty ratio close to 50%. Finally, the effectiveness of the calculation model was validated through experimental tests.
Original languageEnglish
Pages (from-to)3294-3305
Number of pages12
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 1 Jul 2016
MoE publication typeA1 Journal article-refereed


  • DC-DC power convertors
  • hybrid electric vehicles
  • inductors
  • machine windings
  • HEV
  • IWCI
  • close-coupled inductors
  • downsizing effects
  • electric vehicles
  • high power density DC-DC converters
  • integrated magnetic components
  • integrated winding coupled inductors
  • interleaved dc-dc converters
  • loosely coupled inductors
  • magnetic components
  • power 1 kW
  • powertrains
  • Density measurement
  • Inductors
  • Legged locomotion
  • Magnetic circuits
  • Magnetic cores
  • Magnetic flux
  • Windings
  • Close-coupled inductors (CCIs)
  • core model
  • high power density
  • integrated winding coupled inductors (IWCIs)
  • loosely coupled inductors (LCIs)


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