Design Of High Power Vehicle Wireless Energy Transmission System Based On Magnetic Coupling Resonance

As government departments vigorously promote new energy vehicles,more and more users choose to buy pure electric vehicles or hybrid electric vehicles,and the demand for corresponding chargers is also increasing.At present,the traditional charging piles on the market have the disadvantages of fixed position,easy damage,and high maintenance cost.Wireless Energy Transfer Technology(WPT)provides a more convenient and safer option for charging new energy vehicles.The wireless energy transmission technology has different design principles in different application scenarios.Among them,the magnetic coupling resonance type is suitable for application in the field of new energy vehicle charging due to its strong penetration barrier capability,long transmission distance and large transmission power.This thesis first analyzes the principle and topology of various wireless energy transmission technologies,verifies various compensation circuits for different topologies,and summarizes the research status of this technology in international and domestic in recent years.The coil is then modeled by Maxwell simulation software,and the effects of magnetic core,geometry and other parameters on the coil are studied through characteristic analysis and magnetic field analysis.Aiming at the artifacts in the process of radio energy transmission,this thesis proposes to constrain the flux link path by adding a relay coil,thus improving the robustness of the transmission system.The relevant three-coil experiment was carried out and the experimental results were in line with expectations.Based on the theoretical analysis,this thesis designs a high-power wireless energy transmission system.The main circuit and main components of the system are introduced,including power regulation circuit,full bridge inverter circuit,drive circuit and overcurrent protection circuit.Finally,this thesis conducts power-on test and waveform analysis on the completed system.The test results show that the effective value of the output voltage of the system is U_o =194 V,the effective value of the output current is I_o =11.36 A,the output power is P_o =2203.84 W,and the transmission efficiency is 86.88%,which satisfies the design requirements of the subject.Through the horizontal offset test,the test results show that the three-coil system has the ability to resist misalignment.