Design Of Wireless Power Transfer Antenna

Wireless power transfer technology is a popular research direction,which has many advantages compared with wired transmission technology.At present,intelligent electronic devices,electric vehicles,robots and medical devices have a wide range of applications and development in charging.Generally speaking,people are very interested in the transmission efficiency of wireless power transfer technology.According to previous studies,it is found that the transmission efficiency is mainly related to the parameters of coil antenna,matching capacitance and transmission distance.Wireless power transfer technology uses a near-field coupled antenna,and the research and design of the antenna mainly uses three-dimensional electromagnetic simulation software HFSS.The thesis covers the research and design of wireless power transfer antenna.The main work is as follows:(1)The relevant knowledge of coupled mode theory is expounded.The general resonant circuit,oscillating circuit and oscillating circuit with excitation source are numerically analyzed by using coupled mode theory,which provides a theoretical basis for the following research.(2)According to the coupled mode theory,a wireless power transfer model is established by using HFSS simulation software,and its simulation solution and analysis are carried out.A wireless power transfer model based on Gauss process is designed,and the efficiency of wireless power transfer is predicted by combining particle swarm optimization(PSO)algorithm to reduce the time needed to call HFSS software simulation and improve the design efficiency.The error analysis between the efficiency predicted by Gauss process model and the efficiency simulated by HFSS software is made.Finally,the relationship between the parameters of wireless power transfer antenna is given.(3)The mobile phone wireless charging antenna based on Qi standard is studied.This paper explains the Qi standard for wireless charging,determines the size range of antenna parameters according to Qi standard,changes the initial helical radius from 10 mm to 20 mm,changes the number of coils from 10 to 16 turns,and increases the diaphragm,and discusses their effects on antenna transmission performance.(4)The application of mobile phone wireless charging antenna based on Qi standard is studied.The planar circular coil antenna and the planar circular rectangular three-coil antenna are measured.A new kind of wireless charging pillow is proposed,which cancharge multiple devices at the same time.For mobile phones that can not use wireless charging,adding a receiving antenna at its interface can use wireless charging.