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Improvement of Electromagnetic Shielding Structure for Reduction of the Leakage Magnetic Field in WPT System

WPT 시스템의 누설자계 감소를 위한 전자파 차폐구조 개선

  • Kim, Jongchan (Department of Information & Communication Engineering, Chungbuk National University) ;
  • Lee, Seungwoo (Department of Information & Communication Engineering, Chungbuk National University) ;
  • Kang, Byeong-Nam (Department of Information & Communication Engineering, Chungbuk National University) ;
  • Hong, Ic-Pyo (Department of Information & Communication Engineering, Kongju National University) ;
  • Cho, In-Kui (Radio Technology Research Department, ETRI) ;
  • Kim, Nam (Department of Information & Communication Engineering, Chungbuk National University)
  • 김종찬 (충북대학교 정보통신공학부) ;
  • 이승우 (충북대학교 정보통신공학부) ;
  • 강병남 (충북대학교 정보통신공학부) ;
  • 홍익표 (공주대학교 정보통신공학부) ;
  • 조인귀 (한국전자통신연구원 전파기술연구부) ;
  • 김남 (충북대학교 정보통신공학부)
  • Received : 2016.10.13
  • Accepted : 2017.01.07
  • Published : 2017.01.31

Abstract

In this paper, we propose an improved magnetic field shielding structure to reducing the magnetic field generated in the wireless power transfer system operating at a low frequency band. The proposed structure consists of the magnetic material and the conductive material, magnetic field cancelling effect for power transfer is minimized while improving the leakage magnetic field cancelling effect by optimizing the various design parameters in the proposed structure. We analyzed and verified the efficiency of the wireless power transfer system and the reduction effect of the leakage magnetic field through computer simulation and measurement. Analysis results show that power transfer efficiency of the wireless power transfer system utilizing the proposed structure is 77 %, which is maintained at the conventional power transfer efficiency. In addition, compared with the structure maintaining high power transfer efficiency, leakage magnetic field strength is reduced to 29~37 % at the nearest point.

Keywords

Wireless Power Transfer(WPT);Magnetic Field Shielding;Shielding Structure

Acknowledgement

Supported by : 미래창조과학부, ETRI

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