Lagrangian-based equivalent circuit of basic electric-field coupling wireless power transfer system

Hirokatsu Umegami, Kazuhiro Umetani, Masayoshi Yamamoto, Eiji Hiraki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Electric-field coupling wireless power transfer has been commonly analyzed using the circuit model. However, the circuit behavior of this model is not necessarily apparent because their resonant modes can be far complicated than the basic LC oscillation. This issue is addressed in this paper by proposing a novel equivalent circuit for a basic wireless power transfer system. This equivalent circuit has a simpler topology than the conventional circuit model. Furthermore, the equivalent circuit allows intuitive understanding of three types of the resonant modes. Along with theoretical derivation of the proposed equivalent circuit, this paper also presents simulation results, which verified the appropriateness of the equivalent circuit.

Original languageEnglish
Pages (from-to)S168-S170
JournalIEEJ Transactions on Electrical and Electronic Engineering
Publication statusPublished - Oct 2015


  • Electrical coupling
  • Equivalent circuit
  • Lagrangian dynamics
  • Wireless power transfer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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