Research On Stability Of Wireless Power Transfer System Based On Magnetic Coupling Resonance

Wireless power transmission technology is a new power transmission technology. Wireless power transmission eliminates the wire for some special occasions to bring a lot of convenience for modern life. Wireless power transmission technology bases on magnetic coupling resonance using the principle of electromagnetic resonance, so that electrical energy into magnetic energy is transmitted from the transmitting end to the receiving end. Turning magnetic energy into electrical energy, and urging the load carried by receiving coil to work. Since magnetic coupling resonance wireless power transmission technology can be performed in the middle distance, transmission efficiency is highly. So it becomes a research hotspot, and has good prospects for development. This paper mains contents are as follows:This paper analyzes the basic operating principle of magnetic coupling resonance wireless power transmission system, and analyzes the main problem of magnetic coupling resonance wireless power transmission system at present. An experimental and theoretical combination studies the stability of magnetic coupling resonance wireless power transmission system. It designs test device, detailing the oscillation circuit, E class power amplifier circuit in the system, calculating theoretically to the circuit parameters, and designing the peripheral circuit. According to the experimental circuit by designing, to establish circuit models which are structured by the two coils. To establish equivalent circuit loop equation by using circuit theory, and to deduce the relationship between the circuit parameters and system output power and transmission efficiency, makes a theoretical simulation and experimental verification.The innovations of this paper are:1. Going deeply into studying the influence which the parallel capacitance in class E power amplifiers to system stability. According to the theoretical formula calculate the value of the parallel capacitor in the high-frequency circuit. During the experiment, we analysis the influence about different the parallel capacitance values to system output power and transmission efficiency. Experimental results show that the optimum value of the parallel capacitance is important to improve the stability of the system.2. When the system is in resonance, by studying mutual inductance parameter, transmission distance, the resonant frequency to know the theoretical and experimental influences on system stability. Find the best parameter values achieving the highest stability of the system.Finally, we analyze and summarize the experimental procedure precautions and error, and make up approach to the research directions in the future.