Research On Multistage Microwave Wireless Power Transmisson Technology

With the rapid development of electronic information technology,wireless power transmission is one of the indispensable technologies for future development.It plays an increasingly important role in industrial development.The development of efficient and mature wireless power transmission technology is also increasingly needed.As a hot spot in recent years,resonant coupled wireless power transmission is mainly applied to medium and short distance wireless power transmission,which is characterized by high efficiency but short transmission distance.As a representative of long-distance wireless power transmission,radio wave wireless power transmission is characterized by long transmission distance but low efficiency,especially in complex multi-path environment and non-line-of-sight conditions.This paper mainly studies how to solve the main problems faced by the above two wireless power transmission methods.The research contents of this paper mainly include the following aspects:1)Firstly,the wireless power transmission system is equivalent to a two-port network,and the wireless power transmission system is theoretically analyzed.Then the equivalent circuit modeling of the resonant-coupled wireless power transmission system is carried out,and the factors affecting the multi-level wireless power transmission system transmission system are studied.A coupling matrix synthesis method of multi-stage resonant-coupled wireless power transmission system is proposed.2)In this paper,a strapped resonant cavity is designed.The principle analysis and experimental verification of the wireless power transmission system based on the cross-connected resonant cavity are carried out.The two-stage and multi-stage wireless power transmission systems composed of the resonant structure are simulated and experimentally verified.It has been verified that the multi-stage wireless power transmission system can increase the transmission distance and the transmission efficiency.At the same time,the multi-stage wireless power transmission system based on dielectric resonator is designed and verified by simulation.3)The space-time synchronous focusing theory of time inversion with or without relay scatterers was analyzed.A time-reversed wireless power transmission system for wireless power transmission under non-line-of-sight conditions is constructed and verified by simulation.It proves that under non-line-of-sight conditions,the efficiency of wireless power transmission can be effectively improved.