Abstract: The power characteristics and transfer efficiency characteristics of multi-coil wireless power transfer were analyzed,and the relationship between maximum output power and working frequency and the relationship between transfer efficiency and working frequency and load were obtained.Through the multi-coil wireless power transfer equivalent circuit model,the composite insulator of the embedded resonant coil was modeled and analyzed by Maxwell software to analyze the multi-coil wireless power transfer characteristics.This transfer characteristic provides the basis for the power management module design of the receiving coil,and can also be applied to multi-coil wireless power transfer of 35 kV,66 kV,220 kV.

Key words: wireless power transfer, maximum transfer power, transfer efficiency, receiving coil