Winding orientation method to minimise the secondary leakage of a gapped transformer utilised in LLC resonant converter

M. Noah, K. Umetani, M. Yamamoto, J. Imaoka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


It is a common practice in the LLC resonant converter to utilise the transformer leakage inductance as an inductive component in the resonant tank. Nonetheless, the leakage does not exist only on the primary side but also on the secondary side. This Letter proposes a winding orientation method to minimise the undesirable secondary leakage in the transformer. The basic theory of the proposed method relies on Dowell's model and Ampere's law to minimise the stored magnetic energy originated from the secondary windings. Along with the theoretical analysis, experimental tests have been conducted to evaluate the proposed method. The measurements of the leakage inductance are consistent with the expectations of the proposed winding orientation method.

Original languageEnglish
Pages (from-to)157-159
Number of pages3
JournalElectronics Letters
Issue number3
Publication statusPublished - Feb 8 2018

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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