Effect Analysis of Improving Transfer Efficiency for Inserted Resonance Patterns in Wireless Power Charging System of High Speed Magnetic Levitation Train

As the wireless power transfer (WPT) technology based on strongly resonance coupled method realizes large power charging without any wires through the air, there are advantages compared with the wired counterparts, such as convenient, safety and fearless transmission of power. From this reason, the WPT systems have started to be applied to the wireless charging for various power applications such as transportations (train, underwater ship, electric vehicle). Especially, in the case of high speed magnetic levitation (MAGLEV) train, The MAGLEV systems inherently have advantages in higher efficiency due to smaller air gap for wireless power transfer system between guidance and train. Even though it makes possible a convenient power charging system based on strong resonance coupling method, the transfer efficiency is limited structurally. This study aims for the design of inserted resonance coil (Sx) between antenna (Tx) and receiver (Rx) coils with high efficiency and stability in wireless power charging system for high speed MAGLEV train. In this study, authors described design methodology of inserted resonance coils to improve the efficiency for form of different sizes of Sx coil with radio frequency (RF) power of 370 kHz 400 W.