A novel high step-down interleaved converter with coupled inductor

Wilmar Martinez, Jun Imaoka, Yuki Itoh, Masayoshi Yamamoto, Kazuhiro Umetani

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

1 Citation (Scopus)


Nowadays, high power density has become essential in networking, telecommunications and computing applications. Additionally, the electronic equipment used in these applications requires a very-low voltage feeding even when its power supply has a much higher voltage rating. Therefore, high step-down converters with high power density performance are required for these applications. Consequently, a novel two-phase interleaved high step-down converter is proposed in order to fulfill the requirements of high power density and high step-down conversion ratio of these applications. The proposed converter addresses the objective by a particular coupled inductor where three windings are only installed in one core. As a result, the proposed converter can achieve higher step-down ratio than the conventional topologies by adding a winding and two switches to the interleaved two phase buck converter, besides the coupled-inductor configuration. In this paper, the novel topology is introduced and analyzed in order to find its conversion ratio operation. Then, the proposed topology is compared to conventional topologies and some improved high step-down converters recently proposed. Finally, the proposed converter is experimentally validated and the results revealed that the proposed converter shows higher step-down conversion ratio than the conventional buck converter with a further increment of 40% in the conversion ratio when the converter is operating at a duty cycle of 30% and ratio of turns of 2.

Original languageEnglish
Title of host publication2015 IEEE International Telecommunications Energy Conference, INTELEC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479965823
Publication statusPublished - Sept 20 2016
Event2015 IEEE International Telecommunications Energy Conference, INTELEC 2015 - Osaka, Japan
Duration: Oct 18 2015Oct 22 2015

Publication series

NameINTELEC, International Telecommunications Energy Conference (Proceedings)
ISSN (Print)0275-0473


Other2015 IEEE International Telecommunications Energy Conference, INTELEC 2015


  • Coupled-Inductor
  • High Step-Down Converter
  • Power Density
  • Step-Down Conversion Ratio

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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