Research On 3kW Non-contact Charging System Based On AGV

With the development of the logistics industry and artificial intelligence,the application of magnetic coupling inductive static non-contact charging technology to Automated Guided Vehicle(AGV)has accelerated the development of automation in the logistics industry.Compared with the traditional manual plug-in charging method,non-contact charging is more flexible,convenient and safe.In this paper,a magnetically coupling induction static non-contact charging system based on LCC-S compensation for AGV was designed.First of all,in view of the problem of coupling zero in the non-contact charging system with single transmitter and single receiver coil in a certain offset process,a parameter design scheme of single transmitter and dual receiver coils was proposed.Using Ansys Maxwell finite element simulation software to study the influence of magnetic materials on the structure of the magnetic coupling coil,and then build a simulation model of the magnetic coupling coil structure for simulation analysis,and obtain the change curve of its main parameters during the migration process,indicating that the coil structure meets the anti-offset requirements of ±10cm in the X and Y directions and the sizes requirements of the magnetic coupling coil structure.Secondly,in order to achieve a higher transmission efficiency and output power of the system,the LCC-S type compensation network was analyzed,and the equivalent mutual inductance model of non-contact transformer with magnetic coupling coil was built based on the fundamental wave analysis method.It is deduced that the compensation network has higher transmission efficiency and the parameter design method of each component in the compensation network,and then analyzes the influence of higher harmonics on the compensation network.Modeling and analyzing the LCC-S type compensation network with single transmitting and double receiving coils,it is concluded that it has stable output characteristics.In addition,in order to meet the requirements of the AGV constant current and constant voltage two-stage charging method,the back-stage interleaved parallel Buck converter was added to the receiving end after rectification and filtering in series,and its working principle was analyzed.The two-stage charging method of constant current and constant voltage was realized without the communication link at the transmitting and receiving ends.Finally,complete the winding of the magnetic coupling coil to prove the feasibility of the magnetic coupling coil structure design.The system was simulated and analyzed in the PSIM simulation software,and an experimental platform for a magnetic coupling induction static non-contact charging system was built to complete the experimental test.From the experimental results,it can be seen that the transmitter-side inverter can achieve ZVS operation,which guarantees the system has high transmission efficiency.The transmitting coil of the LCC-S compensation network has a constant output current to ensure that the system has stable transmission energy.The output of the interleaved parallel Buck converter meets the constant current and constant voltage two-stage charging requirements of the AGV.The correctness of theoretical analysis and the feasibility of system design.