The selection and comparison of multi-coil wireless power transmission solutions via magnetic resonances

Juntao Huang, Qianhong Chen, Xiaoyong Ren, Siu Chung Wong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Multi-coil links are generally introduced to improve the efficiency and extend the energy transmission distance. However, most of them are relay solutions which are equivalent to reduce the distance. In this paper, two kinds of 3-and three kinds of 4-coil links unchanging the energy transmission distance are proposed respectively. Among these links, by comparing the characteristics, the appropriate coil arrangements of 3-, 4-coil links are selected. Through analyzing the reflected impedance ZR2, it is pointed out that 3-coil link improves the efficiency by increasing ZR2compared with 2-coil link, and the 4-coil link, remaining the increased reflected impedance ZR2of 3-coil link, has another flexibility with the added power coil to adjust the efficiency and output power. Finally, two prototypes with different power levers are fabricated in the lab. The experimental results of the small power prototype can verify the analysis and comparison of efficiency, output power and voltage gain of 2-, 3- and 4-coil links. The big power prototype improves the efficiency from 50.0% in 2-coil link to 85.1% in 3-coil link with Po=508.8W and d23=25cm.
Original languageEnglish
Title of host publication2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
Number of pages6
ISBN (Electronic)9781467371506
Publication statusPublished - 27 Oct 2015
Event7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015 - Palais des Congres de Montreal (Montreal Convention Centre), Montreal, Canada
Duration: 20 Sep 201524 Sep 2015


Conference7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015


  • 2-
  • 3-
  • 4-coil links
  • efficiency
  • the reflected impedance ZR2
  • voltage gain

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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