The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Study on Arrangement of Self-Resonant Coils in Wireless Power Transfer System Based on Magnetic Resonance

자기 공명 무선 전력 전송 시스템에서 공진 코일의 배열에 관한 연구

  • 김진욱 (과학기술연합대학원대학교 전력정보통신공학과) ;
  • 지현호 (한양대학교 전자정보시스템공학과) ;
  • 최연규 (한양대학교 전자 및 통신공학과) ;
  • 윤영현 (한양대학교 전자 및 통신공학과) ;
  • 김관호 (한국전기연구원 전기정보망 연구센터) ;
  • 박영진 (과학기술연합대학원대학교 전력정보통신공학과)
  • Accepted : 2010.06.07
  • Published : 2010.06.30
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Abstract

In this paper, characteristics on arrangement of coils in the wireless power transfer system based on magnetic resonance is presented. A helical structure is used for a self-resonant coil. To design a proper self-resonant helical coil, its inductance and capacitance are obtained. Using the finite element method, the self-resonant coil designed is simulated and characteristics of wireless power transfer with various arrangement between Tx and Rx resonant coils is analyzed. For verification, a prototype of a wireless power transfer system based on magnetic resonance is fabricated and efficiency of different arrangement such as both vertical and parallel arrangements is measured. From the measurement, transmission efficiency of 50 % for parallel arrangement is obtained within twice the diameter of the coil while for the vertical arrangement it is measured within one and a half diameter of the coil. Maximum efficiency of 84.25 % is observed at the distance 40 cm from the resonant coil in the case of parallel arrangement.

본 논문에서는 자기 공명 방식의 무선 전력 전송 시스템에서 공진 코일의 배열에 따른 특성을 제시한다. 공진 코일에는 헬리컬 구조를 사용하였다. 공진 코일을 설계하기 위해 헬리컬 코일의 인덕턴스와 커패시턴스를 구하였다. 유한 요소법을 이용하여 설계된 공진 코일을 시뮬레이션 하였고, 송수전 공진 코일 간의 다양한 배열에 대한 특성을 해석하였다. 검증을 위하여 시제품을 제작하였고, 수직 및 평행 배열일 때의 효율을 측정하였다. 측정 결과, 평행 배열일 때는 50 %의 전달 효율을 얻을 수 있는 구간이 코일 지름의 2배 이내였고, 수직 배열일때는 코일 지름의 1.5배 이내였다. 제작한 시제품은 평행 배열된 송수전 공진 코일이 40 cm 간격일 때 최대 84.25 %의 효율을 보였다.

Keywords

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