Novel magnetic structure of integrated differential-mode and common-mode inductors to suppress DC saturation

Kazuhiro Umetani, Takahiro Tera, Kazuhiro Shirakawa

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

7 Citations (Scopus)

Abstract

Integrating differential-mode (DM) and common-mode (CM) inductors onto a single core has been expected to miniaturize EMI filters. However, the previously-reported magnetic structure often suffers from saturation by DC current, hindering miniaturization by integration. This problem seems exacerbated by the fact that this conventional structure tends to induce large DC flux because its equivalent number of turns for the DM inductance is restricted to only half of the total number of turns. This paper addresses the problem by proposing a novel structure that assigns more turns to the DM inductance to suppress the DC flux more effectively. This paper confirmed theoretically and experimentally that the proposed structure is equivalent to series-connected DM and CM inductors. Additionally, analytical estimation revealed that the proposed structure reduced core volume by 41% compared to the conventional structure under the same amount of copper. These results suggest effectiveness of the proposed structure for miniaturizing EMI filters.

Original languageEnglish
Title of host publication2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
PublisherIEEE Computer Society
Pages304-311
Number of pages8
ISBN (Print)9781479927050
DOIs
Publication statusPublished - 2014
Event7th International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014 - Hiroshima, Japan
Duration: May 18 2014May 21 2014

Publication series

Name2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014

Other

Other7th International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
CountryJapan
CityHiroshima
Period5/18/145/21/14

Keywords

  • Common-mode inductor
  • Differential-mode inductor
  • EMI filter
  • Integrated magnetic component

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Umetani, K., Tera, T., & Shirakawa, K. (2014). Novel magnetic structure of integrated differential-mode and common-mode inductors to suppress DC saturation. In 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014 (pp. 304-311). [6869598] (2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014). IEEE Computer Society. https://doi.org/10.1109/IPEC.2014.6869598