Research On Characteristics Of Magnetically Coupled Resonant Wireless Power Transmission

Wireless power transmission technology avoided the disadvantage of traditional cable power transmission technology, and has broad application prospects in the medical, industrial, life, etc. Resonant Wireless Power Transfe(RWPT) has the advantages of long distance transmission and high efficiency transmission as a new Wireless transmission technology. At present, many domestic and foreign researchers have launched a comprehensive research on RWPT.Firstly, aiming at transmit characteristic of RWPT technology, related researches were carried out in this paper. Mathematical model and analysis about topological structure of RWPT system were constructed by using circuit theory. Then, According to the advantages and disadvantages of its topological structure, a modified two-coils structure of transmission system was presented for remote transmission with high transmission efficiency at the same time, which overcame the drawback that having low efficiency with far long-distance transmission of other topological structure. And the modified two-coil structure of transmission system is promoted to three-coil structure of transmission system for modeling analysis. The analysis of simulation results that the modified three-coil has long distance transmission and high efficiency than the traditional three-coil.Secondly, this paper contrast the changes of each topological structure about the transmission power and transmission efficiency along with load and distance, analysis their advantages and disadvantages. Also deeply research on the modified structure of transmission system referred to that its two-coil structure can adjusted the matching capacitance group to achieve higher transmission efficiency in different transmission distance and load. Moreover, directionality and multiload of transmission system were researched, which focus on analyses about the change of transmission efficiency caused by the deviation of coil, and the effect of transmission efficiency from the coupling between loads under the condition of multiload.Finally, set up kinds of physical device of the RWPT transmission system with basic and modified structure, All the experimental data showed the theory’s accuracy and feasibility.