Strategy of Topology Selection Based on Quasi-Duality between Series-Series and Series-Parallel Topologies of Resonant Inductive Coupling Wireless Power Transfer Systems

Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

Research output: Contribution to journalArticle

Abstract

Series-series (SS) and series-parallel (SP) topologies are widely used in resonant inductive coupling wireless power transfer systems for various applications. However, the selection of an appropriate topology to achieve higher output power or higher efficiency is typically difficult because design optimization of the circuit parameters (e.g., characteristic impedance, load resistance, and mutual inductance) for each topology is generally separately discussed using different equivalent circuits with multiple resonance modes. Therefore, the purpose of this study involves proposing a simple strategy to select an appropriate topology. The proposed strategy is based on quasi-duality between the SS and SP topologies that are elucidated from the novel equivalent circuits derived using Lagrangian dynamics. Based on the quasi-duality, the output power and efficiency of the SP topology are calculated via the equivalent circuit of SS topology. Thus, the quasi-duality offers a simple comparison between the SS and SP topologies. The proposed strategy selects an appropriate topology by comparing only the equivalent ac load resistance, which is the ac resistance including the rectifying circuit and the load resistance, the characteristic impedance, and the ac load resistance that achieves the maximum efficiency or maximum output power of the SS topology. Experiments verify the appropriateness and effectiveness of the proposed strategy.

Original languageEnglish
Article number8918051
Pages (from-to)6785-6798
Number of pages14
JournalIEEE Transactions on Power Electronics
Volume35
Issue number7
DOIs
Publication statusPublished - Jul 1 2020

Keywords

  • Circuit topology
  • efficiency
  • equivalent circuit
  • inductive power transmission
  • lagrangian dynamics
  • output power
  • series-parallel topology
  • series-series topology
  • wireless power transmission

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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