Research On Parameter Design And Interoperabilty Of Networks With LCC Topology For EV Wireless Charging System

With the continuous development of electric vehicles in intelligence and network connection,the demand for wireless charging systems increases greatly.Highly efficient interoperability and interconnection among electric vehicles wireless charging systems is the key to realize more extensive application of electric vehicles in the public field.As bridges between the excitation source and the primary coil or between the secondary coil and the load,the resonant compensation networks play important roles in magnetically coupled resonant wireless charging systems.The LCC resonant topology is widely used in wireless charging systems,and has good robustness and power transmission capability.Therefore,in this paper we take it as the research topic and propose a parameter design method of the networks with the bilateral LCC resonant topology.Through theoretical analysis of the output power,the load and the efficiency of the whole system,the values of compensation capacitors are optimized to realize the best parameter design of the wireless charging system.Simulations and experimental results demonstrate the interoperability of LCC type resonant compensation topology.The paper contents include:Firstly,the detailed characteristics of the four basic resonant topology are analyzed.The input impedance and output load under different compensation modes are studied.The relationship between the various loop currents of the system and coupling coefficient and working frequency is obtained,which lays a foundation for the optimization of compensation component parameters.Secondly,the capacitance parameters are determined by simulation,and the circuit performance of the system is analyzed in depth when the output characteristics and the withstand voltage of the resonant capacitor are analyzed.Further LCC resonance compensation topology simulation model is established.The power,load characteristics,and transmission efficiency characteristics of the LCC resonant compensation topology is analyzed.Simulation analysis shows the variation of each loop parameter and load of LCC type resonant compensation topology.Then bilateral LCC resonant compensation topology parameter design experimental platform is built.The effect of coupling mechanism output power,center point distance and offset on transmission efficiency is obtained.The experimental results are approximately the same as the theoretical analysis.To optimize the parameter design of wireless charging system,the feasibility of the program is verified.Finally,interoperability experimental platform for LCC resonant compensation topology of wireless charging system is established.The energy transfer characteristics of the equivalent circuit of the system under different power and coupling coefficients are analyzed through experiments.The interoperability of LCC resonant compensation topology is analyzed through theoretical analysis,simulation modeling and experimental verification.