Research On Optimization Of Wireless Power Transfer Systems

In recent years,wireless power transfer(WPT)technology has attracted significant attention not only because of its contactless characteristics of transferring power,but also because of its flexibility,security,and reliability,compared to the traditional wired power transfer technology.Magnetically coupled resonant wireless power transfer,based on near.field coupling of magnetic field,is one of the most popular WPT methods.In this paper,facing to the application of industrial electronics,implantable medical devices,and smart home,targeting for improving the power transfer efficiency,the systems of one-to-one(one transmitter to one receiver)and one-to-multi(one transmitter to multi receivers)are studied.Firstly,starting from the analysis of basic circuit models,four basic compensation topologies,S-SP and S-PS compensation topologies are presented in detail.Secondly,aiming at the variation of the load and transfer distance,and the deviation of capacitance in reality,the sensitivity of these parameter for one-to-one system is analyzed which can be used to select suitable impedance matching circuits for efficient WPT.The analysis are verified by simulation and experiments.Thirdly,aiming at the challenge of energizing the implanted neural recording system,a three-phase tiiree-layer WPT system is proposed.The transmitting coil array,the driving circuits,and the receiving coil are designed and optimized to realize the homogeneous magnetic field in the target region.The uniformity is validated through the measurements.Finally,aiming at smart home applications,a new power charging system combining single-wire power transfer technology and WPT technology is proposed.The principle of the system is analyzed,and the design parameters are given out.The experimental results show that the new system is simpler and more flexible for wireless charging.