Study On Wireless Energy Transmission System Based On Electromagnetic Coupling Resonance

With the improvement of science and technology and the development of society,the requirement of power transmission technology is more and more strict.Due to the aging,wear and other reasons,the traditional power transmission mode can shorten the life of the equipment,reduce the performance,and even cause accidents.Under some special conditions,such as underwater and mine,the traditional power transmission mode is difficult to implement and the cost is high because of the wiring and the environment.To solve the above problems,experts and scholars at home and abroad have developed a new type of wireless power transmission technology.The wireless transmission method is based on the principle of electromagnetic coupling resonance.Compared with the traditional power transmission system,it can avoid the problems of wire wear and electric spark,and has the advantages of small safety hazard and less resource consumption.In this paper,wireless power transmission system of electromagnetic coupling resonance is studied from two aspects of theory and experiment.In the theoretical analysis,the principle of electromagnetic coupling and resonance theory is briefly analyzed and the basic working principle of the system is analyzed based on the coupled mode and oscillating circuit theory.The equivalent circuit model of four kinds of structure and the relationship between output power and transmission efficiency and the elements of the system are analyzed.The cause of frequency splitting phenomenon is analyzed and the frequency splitting response curve is obtained by simulation.The relationship between the space position and inductance of coils in the transmission system is studied from the viewpoint of electromagnetic field.In the experimental aspects,The wireless power transmission system is designed,the system includes high frequency transmitter,transmitting and receiving circuit,load and so on.Through the design of the receiving and sending circuit,the system parameters are determined.The transmission characteristics of four kinds of structure are analyzed by simulation,and the connection mode of compensation capacitor is determined.The wireless energy transmission system is established.The maximum output power of the system is 12 W and the transmission efficiency is 35%.The results show that the factors affecting the transmission capability of the system include the coil distance,the system frequency,the load resistance,the space position of the coil and so on.Through the simulation of the model,the change rules and internal relations between the factors and the transmission power / efficiency are summarized.Compared with the experimental data,the accuracy of the theoretical analysisand simulation results are verified,which provides a reference for the future optimization and design of the system.