Analysis of Wireless Power Transfer System Based on Electromagnetic Field Theory

• Published in: 2022 IEEE 5th International Conference on Automation, Electronics and Electrical Engineering (AUTEEE) pp. 974 - 979
• Main Authors: Liu, Xiufang, Wen, Shanshan, Tang, Bingbing, Jiang, Guangli
• Format: Conference Proceeding
• Language: English
• Published: IEEE 18.11.2022
• Subjects: Analytical models; Coils; Couplings; electromagnetic field; Electromagnetic field theory; Mathematical models; power flow analysis; Software; Wireless power transfer
• ISSN: 2831-4549
• DOI: 10.1109/AUTEEE56487.2022.9994290

In this paper, Poynting vector is used to study the existence condition of power flow in a wireless power transfer (WPT) system composed of two coupled coils and the influence of field source parameters on power flow. The electric and magnetic fields in the space around the coupling coil were calculated, and the distribution law of electric and magnetic fields in the space of the coupling coil was analyzed. Poynting vector of any point in the space of the coupling coil was obtained by multiplying the electric and magnetic vectors. The real part of Poynting vector is used to analyze the condition of power flow, and the mathematical model of power flow and field source parameters is established. The influence of geometric parameters and electrical parameters on the efficiency of the WPT system was analyzed by using the control variable method, and the simulation software COMSOL was used to verify the above analysis. Compared with the traditional method of analyzing the WPT system through circuit analysis, the method of analyzing the WPT system by electromagnetic field proposed in this paper has the advantages of considering the comprehensive consideration of both electrical and geometric parameters.