Research On High Power Wireless Power Transfer Via Magnetic Coupled Resonant

The technology of magnetically coupled resonant wireless energy transmission is a new type of wireless energy transmission technology, which uses the principle of non-radiating near-field resonance coupling, that achieves energy transmission efficient and securely. It has the advantage which the traditional wireless energy transmission does not, that will become the most promising technology of wireless energy transmission. Therefore, the study of magnetically coupled resonant wireless energy transmission technology has important value of scientific and application. In this paper, the research on magnetically coupled resonant wireless energy transmission technology is fundamentally, the content primarily covers the theoretical analysis, software simulations, and experiments. The main work is as follows:Firstly, this paper analysis the magnetically coupled resonant wireless energy transmission through theoretical. First analyze the physical process of energy transfer of the ideal simple pendulum and the actual magnetic coupling system through coupled-mode theory, conclude the factors which effect on energy transfers and the phenomenon of frequency splitting. Then established the equivalent circuit model of the magnetic coupling system by the circuit theory, and obtained the expression of transmission efficiency, and analyze the factors that influence the transmission efficiency. At last, this part concluded that the relationship between transmission efficiency and S-parameter resonance system through two-port network theory.Secondly, this paper analyzes the characteristics of the coil when it works on high-frequency, and conclude the calculation expression of resistance, distributed capacitance, inductance, mutual inductance and coupling coefficient, quality factors of the coil, and derived the expression of input impedance in source coil and transmission efficiency in the actual system based on circuit theory. Then complete the design of the coil, and simulate the resonance frequency of the coil and transmission performance of the system by Ansoft HFSS, conclude the resonance frequency and the quality factor of the coil, the frequency characteristic, the distance characteristics, magnetic line of force and magnetic field distribution, the input impedance of the source coil of the system.Thirdly, this paper studies the external objects interference on the system and electromagnetic radiation on the human body. First establish the simulation model of the human body:the study included the human body interference on the system when human body was located in the middle position of the two coils and the critical distance where the human interference can neglect. Then study the electromagnetic radiation of system on the human body. Finally this part studies the slice of different metal materials interference on resonance system though the principle of electromagnetic shielding and simulate.Fourthly, this paper build the experimental platform of magnetically coupled resonance system, then test resonant frequency of the coil, the transmission performance of system, the human body’s interference when it in the middle position of two coils, the slice’s inference of different metals. Then set up the experiment platform of high-power magnetically coupled resonant wireless energy transmission, and light up an incandescent which is 100W when the transmission distance is 30cm, and tested the interference of human body and metal on the power transmission system.