Design And Research Of Low Power Wireless Charging Experiment System

Wireless power transfer technology that the transmitter converts the electric energy into other forms of energy,and then converts the relay energy into electric energy after a distance is separated.Compared with the traditional wired charging technology,it takes up less space resources,avoids the risk of exposed line interface,has higher security and reliability,and has attracted wide attention.In order to make contemporary college students better understand wireless charging technology,this paper designs a set of lowpower wireless charging experimental system for teaching demonstration:First,it introduces the working principle of three kinds of radio energy transmission technology and their development status at home and abroad,compares the advantages and disadvantages of the three ways,analyzes the function and performance requirements of the low-power wireless charging system in detail,analyzes the influence of the resonance frequency and compensation capacity of the system on the transmission efficiency,and provides the theoretical basis for the design of the coupling coil and circuit module.Secondly,the characteristic analysis and design of PCB coil.Firstly,the shape,inductance,coupling coefficient,resistance and skin effect of PCB coil are analyzed,and the simulation analysis of PCB coil is carried out.It is found that the transmission efficiency of wireless charging system can be improved by increasing the outer diameter of the coil,reducing the line width or reducing the line spacing,and the quality of the coil can be analyzed by using the parameter of power product.Finally,several groups of PCB coils are selected for experimental measurement Try.Third,the circuit module design of transmitter and receiver.Firstly,the whole framework of the charging system is introduced,focusing on the selection of the main control chip of the transmitter and the receiver.The peripheral circuit is designed with the chip as the core.Then,the control flow of the transmitter and the receiver is analyzed.Finally,the communication process between the transmitter and the receiver is introduced.Fourth,the test of low-power wireless charging experimental system.In the laboratory environment,the transmission power.When testing the PCB coil of the system,the maximum output power of the system can reach 5.39 w,the maximum transmission efficiency can reach 76.63%,and the effective charging distance can reach 12 mm.