Topological Analysis And Parameter Optimization Of Resonant Compensation For Wireless Energy Transmission

As an efficient,reliable,and flexible new energy access technology,Wireless power transfer(WPT)uses a loosely coupled transformer with the primary side and the secondary side separated as the key link of energy transmission,which is free from various restrictions of traditional electrical energy transmission with direct electrical connection.It has received widespread attention from all walks of life.Because of its long transmission distance and strong anti-interference ability,it has been widely used in many fields including electric vehicles,mobile phones,aerospace,railway transportation,and implanted medical equipment,etc.It has good application prospects.This paper introduces the composition and working principle of the wireless energy transmission system,then uses the equivalent circuit model to anlyze the loosely coupled transformer.Using ANSYS MAXWELL to simulate and analyze the loosely coupled transformer.Introducing the basic compensation topology(SS?SP?PS?PP)for wireless energy transmission,then mathematically model the SS-type and LCC-type resonant compensation topologies and uses the model to explain its basic working principle.In-depth analysis of SS-type and LCC-type compensation topologies,which are widely used in wireless energy transmission technology,comparing the robustness of the two compensation topologies when output is short-circuited,output-circuited or system decouped.The comparing results are summarized in detail.The voltage stress of the resonant compensation capacitors of the two compensation topologies under constant power conditions is secondly compared.Finally,the efficiency transfer characteristics of the two compensation topologies are analyzed,and based on the analysis results,the superior load areas of SS-type and LCC-type resonant compensation topologies are obtained.The optimal-efficiency load points of SS-type and LCC-type compensation topologies are analyzed respectively,and the mutual inductance parameters of the two compensation topologies are optimized based on the optimal-efficiency load points,then the mutual inductance optimization interval of the two compensation topologies are obtained.Finally,the correctness of the theoretical analysis is verified by simulation.An experimental platform for wireless energy transmission is built,and the test methods of efficiency-mutual inductance characteristic experiment and mutualinductance optimization interval verification experiment are introduced.Comparing the efficiency-mutual inductance characteristics of SS-type and LCC-type compensation topologies under different load resistance conditions.Verifing the theoretical correctness of the mutual inductance optimization interval through experiments.