Research On Wireless Power Transmission Characteristics Of Flexible Coils

With the development and popularization of flexible electronics technology and wearable devices,wireless power transfer technology has attracted widespread attention as an emerging technology.Because most of the energy coupling mechanisms in wireless power transmission systems use rigid structural coils,it is difficult to install them on nonplanar objects,so their applications are limited.This topic studies the transmission characteristics of the magnetically coupled resonant wireless power transmission system under the condition of flexible coils being folded and bent.The change of the shape of the flexible coils leads to the detuning state of the system,it needs to be researched on detuning compensation technology.The main research content of this paper is as follows:(1)Firstly,the basic composition and transmission principle of the magnetically coupled resonant wireless power transmission system are summarized and analyzed.Based on the two-coil system,the theoretical and numerical analysis of the system detuning state are carried out in the S-S series topology and the LCC-S hybrid topology.Exploring the effect of detuning on the transmission characteristics of the system(2)The flexible coil is designed under the condition of folding and bending.Exploring the influence of the flexible coil on its equivalent inductance when its own structure is deformed.Considering the deformation of a single coil and both coils,the frequency sweep characteristics and magnetic field distribution of the flexible coil in the folded and bent states are studied.Analyze the influence of different deformation angles on the system frequency characteristics.(3)The deformation of the flexible coil affects the frequency characteristics of the system,therefore,the equivalent capacitance compensation technology and adaptive reactance compensation technology are proposed.Facing the three detuned states of the system: transmitter detuning,receiver detuning,both transmitter and receiver are detuned.Exploring the influence of three detuning states on the transmission characteristics of the system.Compare the advantages and disadvantages of the two compensation techniques and the capacitance compensation technique.Therefore,the two compensation techniques are mixed and an automatic tuning feedback system is proposed and finished(4)Finally,the hardware system is made,and building the system for testing and analysis.Flexible folded coils as experimental objects,using two detuning compensation techniques to experiment in S-S series topology and LCC-S hybrid topology.At the same folding angle,Analyzing the difference in system output power and transmission efficiency under the effects of detuning and compensation.Considering the effect on transmission characteristics under different folding angles...