Research On Wireless Charging System Of Inspection Vehicle Based On Multi-coil Coupling

Wireless power transmission technology based on coil coupling is widely applied in various of fields.However,misalignment of the transmission coil-couple is inevitable in the wireless power transmission system of inspection vehicle,which will affect the performance of the system.In the wireless power transfer systems,the electric power is transmitted based on the magnetic field built by the transmitter coil.Thus,magnetic flux density of the magnetic field produced by the transmitter coil is very important to affect the transmission performance.From the perspective of providing uniform magnetic flux density to the receiving coil,multi-transmitter coil array is proposed to build more uniform magnetic flux density for the inspection vehicle wireless charging system.The multi-transmitter coil array is aiming to enhance the performance of the system to avoid the malposition of the transmission coil coupling.Firstly,the research background and significance of this paper are described.This paper introduces research status of inspection vehicle wireless charging,including the resonant compensation network,designing of coupling structure,positioning detection,optimal control strategy,magnetic field shielding and magnetic field leakage.The research status of multi-transmitting coil wireless charging system is also introduced.Secondly,the serial-serial structure is chosen as the compensation network of system,based on the comparison and analysis of four basic resonant compensation topology structures.The factors that affect the system performance are analyzed,by modeling the Single-Input-Single-Output system and Multiple-Input-Single-Output system and using circuit model.The type of transmission coil commonly used today are analyzed and the planar spiral coil is selected for inspection vehicle wireless charging.Then,the position arrangement of the transmitting coils and the electrical connections between transmitting coils are analyzed.The transmitting coil is arranged by the maximum outer circle method to design the seven different numbers of transmitting coil arrays.Seven kinds of transmitting coil arrays of wireless charging systems are modeled in COMSOL Multiphysics,and the magnetic field uniformity of transmitting coil and the transmission performance of the system are analyzed.Simulation results reveal that the magnetic field generated by the seven-coil array is the most uniform and the anti-offset performance is the strongest in the multi-transmitter coil array.Finally,the hardware circuit is designed for the seven kinds of the systems.The complete experimental platform is set up to verify the correctness and feasibility of transmitter coil arrays.The experimental results show that the magnetic field generated by the seven transmitting coil array is the most uniform among the different number of transmitting coil arrays,and has good anti-offset performance in a certain range.