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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Method to Optimize Maximum Efficiency in MIMO WPT

MIMO WPT 시스템의 최대 효율을 위한 최적화 방법

  • Lee, Hyeongwook (Department of Electronic Engineering, Kyung Hee University) ;
  • Boo, Seunghyun (Department of Electronic Engineering, Kyung Hee University) ;
  • Na, Sehun (Department of Electronic Engineering, Kyung Hee University) ;
  • Lee, Bomson (Department of Electronic Engineering, Kyung Hee University)
  • Received : 2019.02.07
  • Accepted : 2019.03.28
  • Published : 2019.04.30
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Abstract

In this paper, we proposed a method to control input powers and receiver loads for maximum efficiency in multiple-input multiple-output(MIMO) wireless power transfer(WPT) systems. The input voltage ratio between transmitters and receiver loads for maximum transfer efficiency is derived in terms of figure of merits. The theoretically derived input voltages for the transmitters and optimum loads for the receivers were found to be similar to those obtained by a genetic algorithm. We demonstrate the effectiveness of the theory using a few design examples. Using the results obtained from this study, effective and simplified designs of MIMO WPT systems will be possible.

본 논문에서는 다중 입 출력 무선전력전송 시스템의 최대 전송 효율 구현을 위한 송신기 입력 및 수신기 부하 제어방법을 제안하였다. 최대 전송 효율 구현에 필요한 각 송신기의 입력전압과 수신기의 부하를 송수신기 간의 성능지수를 이용하여 유도하였다. 유도한 최적 입력전압과 최적 부하는 적절한 예시를 통해 Genetic algorithm을 이용해 최적화한 결과나 회로 시뮬레이션 결과와 유사함을 확인하였다. 본 논문에서 제시된 이론적 방법을 적절히 활용한다면, 근거리 다중 입 출력 무선전력전송 시스템의 효과적인 설계가 가능할 것이다.

Keywords

JJPHCH_2019_v30n4_286_f0001.png 이미지

그림 1. MIMO 자계 결합 무선전력전송 시스템 Fig. 1. MIMO magnetically coupled WPT system.

JJPHCH_2019_v30n4_286_f0002.png 이미지

그림 2. 2×2 MIMO 무선전력전송 시스템 Fig. 2. 2×2 MIMO wireless power treansmission system.

JJPHCH_2019_v30n4_286_f0003.png 이미지

그림 3. Rx4 위치에 대한 최적 전압 비와 최적 부하 Fig. 3. Optimum input voltage ratio and optimum load.

JJPHCH_2019_v30n4_286_f0004.png 이미지

그림 4. 전압 제어 방법 적용 유무에 따른 전송 효율 Fig. 4. Transmission efficiency as a function of a(Rx4 pos.).

표 1. 송·수신기 간 성능지수 Table 1. Figure of merits between Tx’s and Rx’s.

JJPHCH_2019_v30n4_286_t0001.png 이미지

References

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