Demonstration of a Compact Hard-Switched 3.5 kW DC/DC Converter utilizing Planar Magnetics optimized for low Capacitive Loss

Christian Oestergaard*, Claus S. Kjeldsen, Morten Nymand

*Corresponding author for this work

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

Abstract

It is necessary to accurately determine the power losses in a converter to obtain a high efficient design. This paper presents an in-depth analysis of all the power losses in a converter. The capacitive loss of the transformer and switches is investigated. A highly efficient 7:1 planar transformer is presented and the design is carefully interleaved to provide a small differential-mode capacitance and AC-resistance. Very accurate finite element simulations of the transformer equivalent circuit parameters are performed using Ansys Maxwell. A compact 3.5kW hard-switched isolated full-bridge forward converter is constructed with a power density of 9.9kW/L when the heatsink is excluded and 6.4kW/L when the heatsink is included. The calculated and measured peak efficiency of the converter is in close agreement with 98.0% and 97.7% respectively, thereby proving the accuracy of the power loss calculations.

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
  • Finite-element analysis
  • Impedance measurement
  • Modeling
  • Parasitic elements
  • Planar magnetics
  • Transformer
  • Wide bandgap devices

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