Design And Implementation Of Security And Reliable Communication Protocol For Wireless Power Transfer System

With the development of wireless communication technology,tens of thousands of intelligent devices have entered every aspect of people’s work and life.These intelligent devices are used in new scenarios such as unmanned factories,smart homes,and smart cities to meet people’s needs in the information age.However,in the process of development,additional problems have emerged-energy supply.As the number of devices gradually expands,energy supply has become an undeniable burden,and whether it is using batteries that require frequent replacement or densely packed wires for energy supply,this problem cannot be easily solved.Wireless Energy Transfer(WPT)technology is expected to become a better solution,with multiple advantages compared to traditional solutions,such as low cost,low loss,easy to use,and no need for maintenance.At present,the multi input multi output(MIMO)magnetic resonance wireless energy transfer(MRC-WPT)system in wireless energy transfer technology solutions has gradually become a mainstream research direction due to its advantages of long charging distance and multiple devices.However,there are still some problems in practical applications.On the one hand,the existing solutions ignore the unreliable issue caused by coupling between charging devices to simplify calculations,and on the other hand,past work has ignored the security requirements of uploading private data from charging devices,resulting in the lack of a reliable and secure in band communication protocol.In response to the above issues,this thesis proposes,designs,and implements an in-band feedback communication protocol for MIMO MRC-WPT systems.Compared to existing solutions,this protocol not only solves reliability issues and provides data security,but also improves system performance by utilizing relay phenomena between charging devices.The main contributions of this thesis are as follows:1.A method based on comparing the number of steady-state current values is proposed to address the unreliable issues of existing solutions,which achieves the serial wireless communication capability of magnetic resonance wireless charging systems.By using serial communication,the magnetic coupling problem caused by simultaneous communication of multiple charging devices is avoided.2.In response to the magnetic coupling phenomenon between charging devices,this thesis is the first to propose using magnetic coupling as a communication relay to improve system communication performance.In order to achieve low-cost perception of dependencies between charging devices,this thesis proposes an onion based dependency perception algorithm with low computational complexity.The charging device is divided into different layers based on its communication ability with the charger,and the breadth first search algorithm spontaneously achieves layering.This thesis builds a prototype system for the protocol and conducts a comprehensive experimental evaluation.The results show that compared to traditional methods,it improves the communication success rate by 40%.3.In response to the security issue of in-band private data communication in MRCWPT systems,this thesis proposes a lightweight authentication protocol based on physically unclonable functions and lightweight hash algorithms,which can be lossless compatible and does not affect the performance of the original protocol.After experimental evaluation and comparison with mainstream authentication protocols,the security protocol proposed in this thesis has better lightness and security while being compatible with the original protocol.