Research Based On Electric Field Resonant Radio Energy Transmission

Wireless Power Transmission Technique(WPT)is a electrical power tansmission mode to transfer the electrical power from a power supply to the load without direct contact.Without wire,it is safer and more convenient to transfer the power using WPT charger when compared with the wired charging.Electromagnetic inductive coupling wireless energy transmission(ICPT,Inductively Coupled Power Transfer)has gained research interests from domestic and foreign research team widely because of its transmission distance,transmission power and other characteristics.ICPT can solve many problems effectively,also,electric field is similar to the magnetic field in many properties,and presents symmetry in the basic theory.What's more,in many respects it is even superior to the magnetic field.Therefore,the electric field coupling based wireless power transmission(ECPT,Electric-field Coupled Power Transfer)has become a new focus in recent years.In this paper,a set of electric field resonant wireless power transmission system is designed for the application of wireless power transmission in the rail transit power supply system.It includes the analysis of the current situation of ECPT technology,the coupling structure and tuning system of ECPT,ECPT technology,a new ECPT compensation structure,and the optimal parameters of the compensation structure are deduced by the formula for the general ECPT compensation structure.Based on the ECPT system,two sets of rail transit power supply system were designed,and the experimental model was made through the selected design and hardware materials.Based on LT-spice simulation software,a simulation model is established to verify the feasibility of the new ECPT system.On the basis of theoretical research and simulation analysis,the experimental model is set up and the specific parameters are designed.Finally,a 700W power transmission system,at efficiency of 91%,is achieved with a coupling capacitor only 24pF.