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The Loss Analysis of Three-Phase Wye-Wye and Delta-Delta LLC Resonant Converter under the Leg-Open Fault

  • Journal of The Korea Society of Computer and Information
  • Abbr : JKSCI
  • 2025, 30(7), pp.137~145
  • Publisher : The Korean Society Of Computer And Information
  • Research Area : Engineering > Computer Science
  • Received : May 30, 2025
  • Accepted : July 21, 2025
  • Published : July 31, 2025

Hyun-Jin Jin 1 Jihun So 1 Yoo-Seop Kim 1 Yeong-Jun Choi 1

1제주대학교

Accredited

ABSTRACT

The LLC resonant converter is widely adopted in industrial applications that require high efficiency and high power density. However, open-circuit faults in power switching devices frequently occur, resulting in power supply interruptions and potential safety hazards. In response, research has been conducted on three-phase LLC resonant converters capable of maintaining operation under fault conditions. Nevertheless, conventional studies have primarily focused on post-fault operational behavior, without addressing the associated power losses which are crucial for enabling continued operation after faults. In particular, since power losses are significantly affected by the transformer winding configuration, it is crucial to analyze transformer loss characteristics under fault conditions. This paper presents a comprehensive analysis and comparison of transformer winding loss, core loss, and core loss of resonant inductor before and after a leg-open fault in three-phase LLC resonant converters with wye-wye and delta-delta transformer connections.

Citation status

* References for papers published after 2024 are currently being built.

This paper was written with support from the National Research Foundation of Korea.