A novel transformer for contactless energy transmission systems

Wei Zhang, Qianhong Chen, Siu Chung Wong, Chi Kong Tse, Xinbo Ruan

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

36 Citations (Scopus)


Coupling coefficient k of a transformer is a key parameter affecting the efficiency of a contactless energy transmission systems (CETS). Aiming to obtain higher k, smaller size and lighter weight for the contactless transformer, techniques for the improvement of core structure and coil arrangement are proposed in this paper. A new magnetic reluctance circuit is also proposed for the transformer. Based on magnetic flux coupling, magnetic reluctances are found for the calculation of k. A novel contactless transformer is fabricated for a 60W CETS. The k calculated is verified with experimental measurement to be very accurate. A contactless transformer with k of 0.6 and weight of 60g is achieved. Compared with our previous transformer having k of 0.53 and weight of 122g, the new transformer offers about 2.5% improvement in the maximum efficiency.
Original languageEnglish
Title of host publication2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Number of pages7
Publication statusPublished - 28 Dec 2009
Event2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 - San Jose, CA, United States
Duration: 20 Sep 200924 Sep 2009


Conference2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Country/TerritoryUnited States
CitySan Jose, CA


  • Contactless transformer
  • Coupling coefficient
  • Magnetic reluctance circuit
  • Optimization

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this