Magnetic Coupling Type Wireless Charging Main Circuit And Its Control

Wireless power transmission technology(WPT)is an emerging technology.Wireless energy transmission effectively avoids the disadvantages of wire entanglement and disconnection and sparks,and wireless power transmission technology(WPT)has become a hot and difficult point in current research.According to the principle of wireless energy transmission,wireless energy transmission can be divided into electromagnetic radiation type,electromagnetic induction type and magnetic coupling resonance type.Compared with the above three energy transmission methods,the magnetic coupling resonance wireless energy transmission technology is less affected by the transmission distance,has higher transmission efficiency,larger output power,stable energy transmission and good practical prospects,and has relatively small dependence on the medium.The advantages are getting more and more attention.This technology can be applied to the wireless charging system of electric vehicles to overcome the various disadvantages brought by traditional charging methods.This article first briefly explains the three methods of wireless power transmission.It summarizes the structure and principle of magnetic coupling resonance wireless energy transmission,introduces related theories,and briefly analyzes and summarizes the control strategy of wireless energy transmission.Secondly,comparing the four single structures,it is found that the SPSP hybrid topology meets the experimental requirements of this paper.The SPSP topology is analyzed and the coil parameters are optimized.Next,analyze the influence of different system parameters on output power and efficiency and the influence of load impedance on the equivalent impedance of the receiving side,determine the circuit parameters based on the maximum output current,and find the optimal design value.Finally,comparing the SPSP structure with its similar SPS structure,it is found that the SPSP structure has higher frequency stability,is less affected by load,and is less affected by frequency.The SPSP structure has good output characteristics.After that,the SPSP structure was applied to electric vehicles for analysis and discussion,and it was proved that the structure can indeed improve the system performance.Can be used in practice.