Accurate Analysis Method of Wireless Power Transfer System with Multiple Relays

In this paper, two methods for calculating the maximum efficiency of the wireless power transfer system with multiple relays are presented. One method utilizes the ABCD matrix of two-port network by ignoring the non-adjacent couplings. To improve the accuracy of the analysis, the other method takes into account the non-adjacent couplings between the resonators. The program based on circuit equations is coded by MATLAB. As expected, the method including the non-adjacent couplings gives rise to more accurate result. From the parametric study regarding the number of couplings, at least one non-adjacent coupling should be considered to predict the maximum efficiency and the shifted frequency of the WPT system with relays adequately.