Research On Four Coil Magnetic Resonance Coupling Wireless Power Transfer System Based On LCC-SSS Compensation Network

In recent years,the wireless power transfer system has been widely concerned by scholars at home and abroad.In order to improve the transmission distance of wireless power transmission system,magnetic resonance coupling wireless power transfer system(MRC-WPT)has gradually become a research hotspot.For MRC-WPT systems with different coil types,the research direction is also slightly different.In this paper,a four-coil MRC-WPT structure is used to realize the long-distance wireless power transmission by increasing the operating frequency of the system and designing an appropriate compensation network.The specific contents of this paper are as follows:Firstly,the transmission characteristics and system modeling of two coil MRC-WPT system are analyzed.The modeling method and the transmission characteristics of two coil MRC-WPT system are extended to four coil MRC-WPT system,and the calculation method of coil parameters of four coil MRC-WPT system is given.The transmission characteristics of four coil MRC-WPT system are analyzed,including the output voltage gain,input current gain,output power and transmission efficiency of the traditional series-series-series-series(SSSS)compensation network.And the influence of the input series matching resistance on the overall performance of the system is also studied.Secondly,inductance-capacitance-capacitance(LCC)compensation network is introduced into the drive coil to form inductance-capacitance-capacitance-series-series-series-series(LCC-SSS)compensation network of a four coil MRC-WPT structure.The transmission performance of four coil MRC-WPT system based on LCC-SSS compensation network is analyzed.By changing the inductance and capacitance in the compensation network,the basis for choosing the optimal compensation network parameters is given.By comparing the transmission characteristics between LCC-SSS compensation network and SSSS compensation network,it can be seen that LCC-SSS compensation network is beneficial to reduce the influence of input series resistance on the transmission efficiency of the system,and can effectively improve the transmission performance of the system.Finally,the steps of designing radio frequency power amplifier(RFPA)are presented,and the experimental platform is built.The input voltage and output voltage of the system under SSSS compensation network and LCC-SSS compensation network are collected and plotted as curves respectively.The experimental results verify the correctness and effectiveness of MRC-WPT system based on LCC-SSS compensation network can effectively improve the transmission efficiency of the system.