Combined Multilevel and Two-Phase Interleaved LLC Converter with Enhanced Power Processing Characteristics and Natural Current Sharing

Or Kirshenboim, Mor Mordechai Peretz

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

This paper introduces a new two-phase interleaved flying-capacitor LLC converter topology with high output current applications. Compared to a conventional two-phase LLC converter, the new converter adds a single capacitor that contributes to lower voltage stress on the primary side's switches, automatically balances the current distribution between the phases, and enhances the power processing capabilities. All the attractive features of LLC converters are preserved, such as zero-voltage switching on the primary side's mosfets, zero-current switching on the secondary side's power devices, narrow switching frequency range, and simple design. Full principle of operation and analysis of the converter are described, as well as the converter's primary characteristics and the impact of nonideal components on the current sharing behavior. A 600 W, 400 V-to-12 V experimental prototype is used as a showcase of the attractive features of the new converter, demonstrating excellent current sharing, simple implementation, and high efficiency of up to 97.3%.

Original languageEnglish
Pages (from-to)5613-5620
Number of pages8
JournalIEEE Transactions on Power Electronics
Volume33
Issue number7
DOIs
StatePublished - 1 Jul 2018

Keywords

  • Current sharing
  • LLC converters
  • multilevel converters
  • resonant power conversion

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