Research And Design Of Compensation Network For Magnetically Coupled Resonant Wireless Power Transmission System

With the development of society and economy,the process of industrialization and informatization is accelerating,and various electronic industrial products and consumer goods are continuously improving people’s lives,which puts forward higher requirements for the power supply of equipment.The traditional wired power supply method can no longer meet the power requirements of people’s various devices.People urgently need a new power supply method to make up for the shortcomings of the traditional wired power supply.The wireless power supply technology came into being under this demand and began to develop vigorously.In order to solve the problem that the magnetically coupled resonant wireless power transfer system cannot maintain high-efficiency transmission when the load changes,the research and design of the compensation network for the wireless power transfer system are carried out in this thesis.This thesis summarizes the previous work,analyzes the trans-mission characteristics of magnetically coupled resonant wireless power transfer systems by using appropriate modeling analysis methods,and proposes a class of topology with n-level LC structure,or called LCC-C（CL）ⁿ topological family.Under the guidance of gen-eralized structures,some existing topologies are classified and generalized,and some new topologies with improved transmission properties are proposed.In the LCC-C（CL）ⁿ topol-ogy family,a suitable specific topology can be selected to achieve the desired design goals,such as constant voltage transmission,constant current transmission,or with more stable efficiency performance.The new topology proposed in this study can maintain high-effi-ciency power transfer over a large load range,and at light loads,the transfer efficiency is about 30%higher than that of the existing structure.The content of this article is arranged as follows.Firstly,this thesis briefly expounds the research background and significance of wire-less energy transmission,classifies wireless energy transmission according to different principles and compares their similarities,differences,advantages and disadvantages.This thesis analyzes the research status at home and abroad and focuses on the research status of the compensation network.Secondly,the system composition and working principle of the MCR-WPT system are introduced,the importance of modeling analysis is expounded,the existing three main-stream modeling analysis theories are introduced,and the modeling analysis method adopted in this thesis is determined;The existing basic compensation networks and two typical complex compensation networks are analyzed.Thirdly,an important application field of wireless power transfer,battery charging,is introduced,and some characteristics of battery charging and some requirements for wire-less charging are briefly described.On the basis of the summary of previous research and the analysis of existing compensation network,a new topology family is proposed,and the transmission characteristics of the proposed topology family are analyzed and compared with the existing topology.The advantages of the new topology are revealed through the-oretical analysis.Then,the MCR-WPT system using the newly proposed topology is designed,includ-ing circuit design,coil design,device selection and compensation network parameter tun-ing.Finally,through simulation and building an experimental prototype for testing and verification.The experiment tests the transmission efficiency performance of the system under different loads and the transmission efficiency performance when the system coil coupling changes.The experimental results are consistent with the theoretical analysis,which verifies the correctness of the theoretical analysis and the feasibility of the experi-mental prototype design of the system.