Optimal Design and Tradeoffs Analysis for Planar Transformer in High Power DC-DC Converters

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2010


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A planar magnetic is a low profile transformer or inductor utilizing planar windings instead of the traditional windings made of Cu-wires. In this paper, the important factors for planar transformer design including winding loss, core loss, leakage inductance and stray capacitance have been investigated individually. The tradeoffs among these factors have to be analyzed in order to achieve optimal parameters. Combined with a certain application, four typical winding arrangements have been compared to illustrate each their advantages and disadvantages. An improved interleaving structure with optimal behaviors is proposed, which constructs the top layer paralleling with the bottom layer and then in series with the other turns of the primary so that a lower magneto motive force (MMF) ratio m can be obtained as well as minimized AC resistance, leakage inductance and even stray capacitance. A 1.2-kW full-bridge DC-DC converter prototype employing the improved planar transformer structure has been constructed, over 96% efficiency is achieved and a 2.7% improvement compared to the non-interleaving structure is obtained.
Original languageEnglish
Title of host publicationThe 2010 International Power Electronics Conference - ECCE ASIA - IPEC-Sapporo 2010
Publication date2010
ISBN (print)978-1-4244-5395-5
StatePublished - 2010
EventThe 2010 International Power Electronics Conference - ECCE ASIA - IPEC-Sapporo 2010 - Sapporo, Japan


ConferenceThe 2010 International Power Electronics Conference - ECCE ASIA - IPEC-Sapporo 2010
CitySapporo, Japan
Period01/01/2010 → …

Bibliographical note

Copyright 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.


  • DC-DC, stray capacitance, Planar transformer, leakage inductance, winding loss, interleaving, core loss
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