System Modeling and Characteristics Analysis of Dynamic Wireless Power Transmission System with Multiple Air-Core Transmitting Coils

At present, the freedom of load movement of wireless power transmission system in single transmitter and single receiver mode is not high. The receiving power and efficiency of the system are easily affected by the change of the relative position of the receiving and transmitting coils. In order to improve the degree of freedom of the receiver, this paper proposes a dynamic wireless power transmission system with multi transmitting structure based on air-core coils. The circuit model of wireless power transmission system with multiple transmitting coils is deduced. The mutual inductance between the multiple transmitting coils and the movable receiving coil is analyzed. The characteristics of receiving power and system efficiency varying with the position change of the receiving coil are studied further. The application of multiple transmitting coils is benefit to promote the system efficiency stability of dynamic wireless power transmission system for movable load.