Leakage Inductance Calculation for Planar Transformers with a Magnetic Shunt

Jun Zhang, Ziwei Ouyang, Maeve C. Duffy, Michael A. E. Andersen, William G. Hurley

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The magnetic shunt is generally inserted in a planar transformer to increase the leakage inductance which can be utilized as the series inductor in resonant circuits such as the LLC resonant converter. This paper presents a calculation methodology for the leakage inductance of the transformer with a magnetic shunt by means of the stored magnetic energy in the primary and secondary sides of the transformer using the magnetomotive force (MMF) variation method, as well as the stored energy in the shunt based on the reluctance model. The detailed calculation method is described. Both the FEA simulation and the experimental results have proven the validity of the proposed calculation method for leakage inductance.
Original languageEnglish
JournalI E E E Transactions on Industry Applications
Issue number6
Pages (from-to)4107
Number of pages4,112
Publication statusPublished - 2014


  • Leakage inductance
  • magetomotive force (MMF)
  • Magnetic shunt
  • Planar transformer
  • Resonant converter
  • Reluctance model


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