양극성 자기장 커플러 구조를 가지는 무선전력전송 시스템의 누설 자기장 저감을 위한 페라이트 격벽 구조 설계

Abstract

In this study, ferrite wall structures are proposed for reducing leakage magnetic field in a wireless power transfer system with a bipolar magnetic coupler structure in the form of a ferrite core inductor. In the proposed framework, the magnetic field of the transmitting coil remains on the ferrite wall, and the leakage magnetic field is minimized. However, when the magnetic field of the transmitting coil is induced in the ferrite wall, the mutual inductance and coupling coefficient decrease. Therefore, in this paper, the height of the ferrite wall structure is adjusted to minimize the decrease through simulations based on the reluctance circuit model. The performance of the proposed structure was verified through simulations and experiments. The simulation results indicated that the magnetic field leakage effectively decreased with an increase in the height of the ferrite wall structure. The results of experiments demonstrated that although the power transfer efficiency of the framework with the proposed ferrite wall was 3.6 % lower than that of the framework without the ferrite wall, the corresponding leakage magnetic field was reduced by more than 60 %.