Optimized Planar Inductor for a High Current 3.5 kW Isolated DC/DC Converter

Christian Oestergaard*, Claus S. Kjeldsen, Morten Nymand

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The paper presents several planar inductors optimized for low power loss in a 3.5 kW isolated full-bridge forward converter, which is operated at a large output current. The inductors are optimized by use of a winding configuration which is proven to have an AC-resistance that are unaffected by the height and parallel connection of the turns in its winding configuration. The current density is simulated in the turns of the inductors by using finite element method analysis with the Ansys Maxwell software. The Ansys simulations have an excellent accuracy which is proved by comparing the simulated equivalent circuit parameters values with measurements from an impedance analyzer. Two inductors are designed and constructed, and their total power loss is measured in the converter and compared. The peak-efficiency of the converter that utilizes the inductor with the lowest loss is measured to 97.7 %, whereas the inductor with the second lowest loss has a measured peak-efficiency of 97.6 %.

Original languageEnglish
Title of host publication2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe
Number of pages10
PublisherIEEE
Publication date6. Sep 2021
ISBN (Electronic)978-9-0758-1537-5
Publication statusPublished - 6. Sep 2021
Event23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe - Ghent, Belgium
Duration: 6. Sep 202110. Sep 2021

Conference

Conference23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe
Country/TerritoryBelgium
CityGhent
Period06/09/202110/09/2021

Keywords

  • DC-DC converter
  • Design optimization
  • Finite-element analysis
  • Impedance measurement
  • Planar magnetics

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