Design of Series Inductors to Reduce EMI and Improve Power Bifurcation Phenomenon in WPT System

In this paper, it is analyzed that the EMI issue and bifurcation phenomenon in the WPT system can be alleviated by using the series inductors. If the series inductors are added, the impedance at harmonics increases, the harmonic currents decrease, and as a result, it is inferred that the harmonic magnetic field component decreases. In addition, it is analyzed that the bifurcation phenomenon, in which the frequency of maximum power transfer moves away from the system resonant frequency, is also alleviated by adding series inductors. The contents are analyzed mathematically, and their effectiveness is proved through simulation.