| Wireless power transmission technology is a new technology for power transmission through non-contact methods.At present,the conventional charging method mainly uses wires to connect the power source and the load.This charging method has many drawbacks,such as complicated wiring,poor mobility of the charging device,repeated wear and tear caused by contact wires and contact sparks,Underwater,humid environment,this charge is less desirable.Compared with the wired mode,wireless charging can be more flexible,safe and efficient to charge mobile devices.At present,there are three transmission modes of wireless power transmission,electromagnetic coupling,microwave radiation and magnetic coupling.Among them,the magnetic coupling resonance technology can realize the transmission of medium-distance and low-power electric energy without being affected by obstacles,and the requirements for the charging position are not so harsh,and become the main research object in this paper.This paper first introduces the research background and significance of wireless power transmission.Based on the three existing transmission modes,the current research status at home and abroad are investigated.With the principle of magnetic coupled resonant wireless power transmission,the energy flow of the system is analyzed and a system block diagram is made.Based on Kirchhoff's circuit theory,the coupling model of the system is analyzed and deduced theoretically.Aiming at the problem that the traditional two-coil wireless power transmission is not efficient and the transmission distance is limited,an improved method is proposed in this paper,which is to add the relay coil to form a three-coil structure.Then,focusing on the equivalent circuit of the three-coil structure,the efficiency relation of the three-coil system is deduced and the relationship between system efficiency and coil mutual inductance and coil position is obtained.In order to optimize the efficiency of the system,this paper presents a two-dimensional planar traversal method.By traversing the position of the relay coil in the plane,the position range of the relay coil with the efficiency of 80% or more can be obtained.With the help of interval dynamic optimization algorithm,the results provide data support.Using ANSYS electromagnetic field simulation software to simulate the electromagnetic field of different structures of wireless power transmission system to explore the magnetic field induced strength between the coils under different conditions and provide simulation support for the research of wireless power transmission and provide the theory for the design and construction of the following system platform guide.Finally,set up experimental platform and related experiments.In this paper,several aspects of the system are directly related to the wireless power experiment platform design,including: the selection of resonant coil,the choice of resonant capacitor,power supply circuit design,transmitter and receiver circuit design,control circuit design,And makes the corresponding design to the system control strategy and the software flow chart.Then the system related experiments were carried out,and the rationality of the above theoretical analysis and simulation results were verified through experiments. |
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