Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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High Efficiency Magnetic Resonance Wireless Power Transfer System and Battery Charging Chip

자기 공진 방식의 고효율 무선 전력 전송 시스템 및 배터리 충전 칩

  • Youn, Jin Hwan (Department of Electronics Engineering, Kyungpook National University) ;
  • Park, Seong Yeol (Department of Electronics Engineering, Kyungpook National University) ;
  • Choi, Jun Rim (Department of Electronics Engineering, Kyungpook National University)
  • 윤진환 (경북대학교 전자공학부) ;
  • 박성열 (경북대학교 전자공학부) ;
  • 최준림 (경북대학교 전자공학부)
  • Received : 2014.12.30
  • Accepted : 2015.05.21
  • Published : 2015.06.25
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Abstract

In this paper, we propose enhanced wireless power transfer system based on magnetic resonance for portable electronic device charging. Resonators were designed and fabricated for efficiency improvement and miniaturization through electromagnetism simulation using HFSS(High Frequency Structure Simulator). Impedance matching network is employed to minimize reflections that is caused by difference between input impedance and output impedance. Receiver IC that consist of rectifier and Low Drop Out(LDO) regulator were designed and fabricated to reduce power loss. This chip is implemented in $0.35{\mu}m$ BCD technology. A maximum overall efficiency of 73.8% is determined for the system through experimental verification.

본 논문에서는 모바일 기기의 배터리 무선 충전을 위해 효율이 향상된 자기공진방식 무선전력전송 시스템을 제시한다. 전송 효율의 향상과 소형화를 위해 HFSS를 이용한 전자기 시뮬레이션을 통해 공진기 구조를 설계 및 제작하였다. 입력 임피던스와 출력 임피던스 차이에 의한 반사를 줄이기 위해 임피던스 매칭 네트워크를 적용하였다. 모바일 기기의 배터리 충전을 위해 $0.35{\mu}m$ BCD 공정을 이용하여 정류회로와 레귤레이터를 포함하는 전력수신 칩을 설계하였다. 무선전력전송 시스템 효율은 최대 75.1%를 보였으며 시스템 검증을 위한 실험에서 최대 70cm거리에서 상용화된 휴대폰 배터리(3.7V, 6.11Wh, 1680mAh)를 부하로 사용하여 충전을 확인하였다.

Keywords

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