Investigation of magnetic resonance coupling circuit topologies for wireless power transmission

Jingchen Wang, Mark Leach*, Eng Gee Lim, Zhao Wang, Yi Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Magnetic resonance coupling circuits have four general topologies; however, there is a lack of comprehensive theoretical analysis with experimental verification for each of these topologies regarding their attractiveness for wireless power transfer (WPT). This article provides this for each of the four topologies to fully understand their differences and allow the selection of the most appropriate type based on system requirements. In addition, a problem associated with the resonance coupling method is the phenomenon of frequency splitting, which can lead to a high-power transfer efficiency but low-load power at the resonant frequency. Reasons for frequency splitting and methods of circumventing the problem will be illustrated in this article. Of the four topologies, the series-parallel (SP) (input-output) circuit configuration is the most efficient for the realization of a WPT system with a large load impedance, in terms of achieving both a high power transfer efficiency and high-load power.

Original languageEnglish
Pages (from-to)1755-1763
Number of pages9
JournalMicrowave and Optical Technology Letters
Issue number7
Publication statusPublished - Jul 2019


  • frequency splitting
  • magnetic resonance coupling
  • topologies selection
  • wireless power transmission

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