Analysis And Design Ofwireless Power Transmission System Based On Electromagnetic Resonance Coupling

Since the large-scale application of electric power, the transmission of power has always been wired transmission. With increasing variety of electrical equipment, the shortcomings of wired transmission become more and more because of various wires, chaos of charging circuit, contact failure between the wires and the contact spark, and so on. On the other hand, people begin to look for new energy transmission because of charging problem of electric cars, electrified railway power supply problems, large-scale application of Internet of Things and increasing demand of not suitable for wired power supply under mine.So far, there are three ways of wireless power transmission: the microwave, the electromagnetic resonance induction and the electromagnetic coupling. By comparing advantages and disadvantages of the three ways, this paper take wireless transmission of the electromagnetic coupling as study object. The wireless transmission of the electromagnetic resonance coupling mainly in near-field of the electromagnetic field, comparing to the other two transmissions, wireless transmission of the electromagnetic resonance coupling is suitable for medium distance, medium power transmission. Based on the theoretical analysis, this paper carries on the design of wireless energy transmission system, and verifies the theory by experiment.Firstly, this paper sorts out the mechanism of the electromagnetic resonant coupling, and analyses the electromagnetic resonance properties and nature of the coupling circuit from theory, and derives the formula of wireless energy transmission power and efficiency, and analyses the factors affecting energy transmission of frequency, voltage, coupling coefficient, character of the coil,distance, load and so on. Finally, we get the condition of maximum power transmission and maximum efficiency transmission。Then this paper designs the wireless energy transmission system, and calculates the transmitting and receiving circuit parameters theoretically. Through the simulation of FEKO, ADS and Matlab, the data of transmitter and receiver circuit is conducted. By comparing the simulation and theory, the basic parameters of the transmitter coil and the receiver coil are determined.At last, the transmit coil, the switch circuit, drive circuit, and low voltage power source are produced. Through actual measurement data, the relative characteristics ofthe magnetic resonance wireless power transmission coupling are analyzed, and it verify the correctness of maximum power and maximum efficiency.According to the experimental data, the shortcoming are analyzed, this paper puts forward a measure of adding relay coil to improve power transmission. And it is verified from experiments. Finally, we realize the low-power wireless energy transmission..