Efficiency Improvement on LLC Resonant Converter Using Integrated LCLC Resonant Transformer

Ray Lee Lin, Lung Hua Huang

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


This paper presents the efficiency improvement on the comparative half-bridge LLC resonant converter using the integrated LCLC resonant transformer. The conventional isolated LLC converter demands large leakage inductance to attain high power factor for the resonant tank. However, the large leakage inductance requires more turns of the transformer to sustain sufficient magnetizing inductance. As a result, high number of turns causes more copper loss and lower efficiency for the LLC resonant transformer. In order to reduce the demanded leakage inductance, a resonant capacitor can be connected in parallel to the magnetizing inductor through an auxiliary winding as an LCLC resonant transformer. Finally, the resonant transformer of a commercial 300 W LLC resonant converter is converted as an integrated LCLC resonant transformer with lower leakage inductance for efficiency comparison.

Original languageEnglish
Pages (from-to)1756-1764
Number of pages9
JournalIEEE Transactions on Industry Applications
Issue number2
Publication statusPublished - 2018 Mar 1

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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