Research On Power Control And Efficiency Optimization In Magnetic Coupling Resonant Wireless Power Transfer System

With the development of technology,wireless power tranfer technology is a hot research topic today.There are three transfe modes of wireless power tranfer technology,namely electromagnetic induction type,microwave radiation type and magnetic coupling resonance type.Compared with the electromagnetic induction type and the microwave radiation type,the magnetic coupling resonant wireless power tranfer technology is more concerned because of its small radiation,harmless to the human body,strong penetrability,and medium distance.Transfer distance,transfer power and transfer efficiency are three key issues in the study of magnetic coupling resonant wireless power tranfer systems.The main research content of this paper is the research on the optimization design of power control and transmission efficiency in magnetic coupling resonant wireless power tranfer systems.The main research contents of this paper are as follows:(1)Introduced the relevant parameters in the magnetic coupling resonant radio energy transmission system,three analysis theories(coupled mode theory,filter theory,circuit theory),two major transmission criteria(maximum power criterion,maximum transmission efficiency criterion).(2)Aiming at the power and efficiency problems caused by cross interference in multi-receiver wireless power transfer systems,this paper proposes a load isolation scheme.Based on circuit theory,the basic structure of the proposed T-impedance converter and the principle of load isolation are analyzed.The experimental platform is built.The experimental results verify the feasibility of the load isolation scheme.(3)Aiming at the power fluctuation and transmission efficiency fluctuation caused by the relative position changes of the transmitting side and the receiving side in the dynamic magnetic coupling resonant wireless power transfer system,this paper proposes a power control and transfer efficiency optimization strategy.Based on the circuit theory,the power control principle and transfer efficiency optimization principle are theoretically demonstrated and analyzed.The experimental platform is built.The feasibility of the power control and transmission efficiency optimization strategy is verified by experiments.