Topology Study Of Multi-Load Wireless Power Transfer System Based On Electric Field Coupling

Wireless Power Transfer(WPT)technology has developed rapidly in recent years and has gradually been applied to various devices.It can effectively solve a series of problems such as the chaotic power line of traditional wired charging,cable aging,and contact with sparks..Capacitive Power Transfer(CPT)technology has become a new and popular research object due to its low cost,wide application range and simple system structure.However,since the equivalent coupling capacitance of the coupling mechanism of the CPT system is extremely small,to improve the transmission power and transmission efficiency,high frequency and large port voltage are often used for transmission at present.If there is no reasonable parameter design,too high voltage will cause serious safety accidents.At the same time,the current research on the existing CPT system is mostly focused on a single load,and the application scenarios of multiple loads have not been studied,which can no longer meet the actual needs.To solve the above problems,this article mainly studies and analyzes the application of electric field coupling wireless power transmission technology to multiple loads.Firstly,through theoretical analysis,the equivalent network models of single input-single output(SISO)and single input-multiple output(SIMO)electric field coupling wireless power transmission system coupling mechanisms are established respectively.Combined with the existing CPT system compensation topology model,an improved double-sided LCLC compensation topology suitable for multi-load,primary and secondary parameter separation design is proposed.First,analyze the LCL network model in the topology,and on this basis,analyze the input and output characteristics of the compensation topology proposed in this topic;then,combine the research of reference documents to calculate the maximum active power transmission capacity of the two-port network model,and investigate The transmission capacity characteristics of the topology proposed in this topic;finally,the system frequency characteristics are analyzed for the high-order circuit topology,and appropriate component parameters are selected according to the resonance relationship of the passive components and the actual situation,and the simulation and the experimental platform are built for verification.This paper presents a topology structure of an electric field coupling wireless power transmission system when it is applied to a multi-load environment,so that the primary and secondary side parameters of the system can be designed independently without being affected by the other party,and while maintaining the maximum transmission active power Under the premise of power capacity,minimize the impact of multiple loads on system parameters.Finally,a CPT system with a single load output power of 500 W,a load number of 2,and a transmission efficiency of about 88% was built,which verified the feasibility of the system topology design.