Research On Integrated Coil LCC-S Magnetically Coupled Resonant Dynamic Wireless Charging Technology

Compared with wired charging,wireless charging has gained wide development in recent years due to its advantages such as high safety,wide application range,and high degree of intelligence.With the rapid development of electric vehicles,robots and other devices,wireless charging has become a new power supply mode,and has promoted intellectualization of electrical equipment.In terms of reducing electric vehicle battery packs and charging time,dynamic wireless charging has a unique advantage.It enables electric vehicles to continuously obtain energy from the transmission coil buried in the ground during the movement.In this way,it is possible to reduce the battery weight and shorten the charging time while increasing the cruising rangeIn this paper,an integrated coil LCC-S topology magnetically coupled resonant dynamic wireless energy transmission system is designed.The integrated coil is used to replace the original iron core inductance compensation element,which improves the accuracy of the detection and improves the smoothness of the output power.Moreover,the required inductance value can be easily realized by using ordinary Litz wire,reducing the time and economic cost brought by customizing the inductor,and simplifying the space occupied by the systemIn this paper,the LCC-S circuit model of the integrated coil is analyzed According to the different positions of the receiving end relative to the transmitting end,this paper theoretically analyzes the transmission characteristics of the system with single transmitting coil and dual transmitting coils,and the expression of output power and efficiency are obtained.This theory provides a basis for the design of system parameters and provides guidance for analyzing the transmission characteristics of the system.This paper uses ANSYS Maxwell 3D simulation software and MATLAB to jointly analyze the influence of the coil position on the transmission characteristics of the system.Based on this,a suitable coil arrangement is selected.The current direction of adjacent transmitting coils is simulated by using Maxwell external circuit,and the influence of different current direction on the transmission characteristics of the system is analyzed.It provides theoretical guidance for the rational arrangement of transmitting coils.The complex control designs during dynamic transmission is avoided and the overall cost of the system is reducedIn order to reduce system loss and electromagnetic radiation,the method of segmented switch transmitting coil is adopted in this paper and the phase-shift voltage regulation circuit is used to control the system's standby-charge mode.The detection theory based on reflection impedance and the principle of the phase-shifted full-bridge voltage regulator circuit are analyzed.The feasibility of the detection theory and phase-shifted full-bridge control method are verified by simulation.The detection method based on reflection impedance provides theoretical guidance for segmented switching of the transmitting coilIn order to further verify the correctness of the theoretical analysis and simulation,an experimental platform based on LCC-S magnetically coupled resonant dynamic wireless power transmission system is set up in this paper.The function and construction process of each module of the experimental platform are briefly introduced.The effect of the integrated compensation coil inductance on the system transmission is conducted.The experiments on the transmission characteristics under system offset are conducted,and the offset characteristic curves of the transmitter current,receiver current,output power,and efficiency of the system are obtained.The detection method is also verified by experiment.Finally,the experiments verified the correctness and feasibility of theoretical analysis and simulation verification.