Study On Magnetic Resonance Based Wireless Power Transmission System With A New Compensation Network

With the rapid development of science and technology, humans are tending to pursue facilitate intelligent life. Traditional wired charging lifestyle has been unable to meet the higher standards of living due to its movement limitation. This demand brings out the wireless charging lifestyle. In a very short period of time, lots of wireless charging devices, such as wireless charging electric toothbrushes, wireless charging cell phones, wireless charging automobile, appear among human life. How to achieve long-range, high-power, small size and stable wireless energy transmission system, is the focus and difficulty of current research.Since the transmitting and receiving coils can be modeled as a weakly coupled transformer, it is only possible to achieve power transmission by introducing the compensation network. However, different compensation network structures make the system characteristics different. Thus the corresponding power control methods and system design methods will also be different. At present, the widespread use of the compensation structure are four basic network labeled as SS,SP,PS and PP. However each compensation network has its own inherent problems. New compensation network structure is always needed. In this paper, a dual CC compensation network structure is proposed, which is based on the transformer equivalent model of leakage inductance. By compensating the leakage inductance and magnetizing inductance, the system presents the approximate characteristics of an ideal transformer, which is very advantageous to the practical application.In this paper, the system features of dual CC compensation network has been detailed analyzed, including system source impedance characteristics, voltage gain characteristics, and finally the efficiency and power characteristics. Research on these system features provides the theoretical basis for system optimal design.Based on the theoretical analysis, a design example is given. Some innovations are as follows. Firstly, the prototype choose the twelve step waveform which has a lower THD value as the excitation waveform, instead of the current widespread use of square wave. Secondly, solved the problem of without high-frequency three-phase three-cylinder transformer core on the market and some others existing in the commissioning process. Then, gives a detailed design process of the coil, the coil casting process was studied in order to get stable electrical characteristics. Finally, completed a 100 W, transmission distance 0.5 m, low coupling coefficient of 0.02 prototype and some associated validation experiments. The experimental results verify the theoretical analysis and system design parameters. Under nominal operating conditions, the coupler efficiency is nearly as high as 90%.