Research On Impedance Matching Of Magnetic Coupling Resonance Wireless Power Transfer T Echnology

Magnetic Coupling Resonance Wireless Power Transfer(MCR-WPT)has advantages of high transmission efficiency,moderate transmission distance,and low environmental impact,etc.But,it also has certain problems.When the coupling state of the system deviates from the optimal point,the load power and transmission efficiency will continue to decline,which will seriously affect the system performance.Impedance matching is one of the important methods to solve this problem.The purpose of this paper is to perform theoretical analysis,circuit simulation,and experimental verification on the impedance matching problem of single receiver model,multiple receivers model,and multiple receivers with cross coupling model in MCR-WPT system.The main works of this paper are as follow:Theoretical analysis of impedance matching for single receiver model,multiple receivers model,and multiple receivers with cross coupling model shows that there is an optimal coupling coefficient making the input impedance equaling to the internal resistance of the power supply,that is,when the impedance is matched,the output power of the system is the largest.The transducer power gain reaches a maximum value and is equal to the power gain.In addition,the influence of cross coupling at the receiver on the multiple receivers with cross coupling model is analyzed,and the conclusion is that cross coupling will reduce the load power and efficiency of the system.This paper proposes a forward and reverse fusion L-type impedance matching network for source side impedance matched.The proposed impedance matching network has the same number of component as the ordinary L-type network,but the matching forbidden area of the impedance matching network is reduced.As the input impedance of the multiple receivers with cross coupling model is capacitive,a forward and reverse fusion L-type impedance matching network with series compensation inductor is proposed to realize impedance matching of multiple receivers with cross coupling model.Based on the above theoretical analysis results and the proposed impedance matching network,this paper designs simulation circuits based on ADS simulation software and sets up an actual physical experiment platform,which verifies the accuracy of the theoretical analysis results and the feasibility and effectiveness of the proposed impedance matching network.This paper studies the impedance matching of MCR-WPT system,which can improve system performance and expand the applications of MCR-WPT system.