Study On The Coupling Characteristics Of Magnetically Coupled Resonant Wireless Power Transfer System

Wireless power transmission system is better than the transmission by the wire which has many defects such as the poor security,the low reliability and the short service life because of the ablation contact original.It is not only convenient transfer and broad application prospects but also great research significance and practical value.In this paper,we introduced several of the current mainstream wireless power transmission technology.The advantages and the research status at home and abroad are discussed as research topics of the Magnetically Coupled Resonant Wireless Power Transfer.The principle and electromagnetic field range of MCR-WPT is analyzed.Then we build transmission system models with circuit theory and coupled mode method to analysis the effect of impedance and frequency on transmission characteristics.The transmitted power and efficiency equation is analyzed.And the numerical simulation of mutual inductance model is studied in three cases: the coil size,parameters and distance.It affect directly about the magnetically coupled that using the right coil parameters at the right range.The small-size coil should be used for a close range and a farther distance call for larger radius.Then we have a more research by COMSOL Multiphysic to the resonant circuit.Then under different coil structure and position have been simulated,and the distribution of electromagnetic field have been analyzed.The simulation results show that the transmission effect of the circular coil is better than that of the other shapes,and the coupling effect of the multilayer coil is better than that of the plane spiral coil.The hardware is separated into independent functional modules based on the analysis result.Hereafter,the laboratorial platform is built,and circuits are debugged.Finally,respective experiment on transmission distance,the excursion and the deflection angle has proved the validity of theoretical calculation.The coil structure after the optimization showed a significant improvement in transmitted performance and permitted variation ranges.