Research Of The Efficiency On Wireless Power Transfer System Based On Coupled Magnetic Resonance

As a new concept and method in power transmission, Magnetic coupling resonant radio system (magnetically coupled resonant wireless power transfer, MCR-WPT) has extensive theoretical support and application prospect. MCR-WPT is based on electromagnetic induction principle, with the help of technology in high frequency inverter, loosely coupled transformer, technology of rectifier and filter etc, which can transfer electrical power from the power supply side to the load side for non-contact transmission. Than traditional power supply methods, it shows the unique advantages: (1) power transmission without wires, security, stability, and the advantages of transmission direction is not restricted; (2) not affected by non-magnetic interference, less dependence on media, etc. MCR-WPT deserves more and more attention and research.This article firstly analysis the current common three kinds of radio transmission technology:radiant, electromagnetic induction, magnetic coupling resonance, and has a contrast of the transmission distance, transmission efficiency, system stability and security performance and so on, which lays the research object of this article (MCR-WPT). Then analysises the current main research achievements and the research status at home and abroad on MCR-WPT technology.According to MCR-WPT system structure, the working principle of the system is analyzed and two coil structure of loosely coupled transformer equivalent circuit model and the system topology structure is constructed. This article mainly chooses the equivalent circuit in series-series resonance compensation as the research object, using the theory analysis method of coupled mode theory and the lumped parameter circuit to get the system transmission energy transmission inherent law.The impact factor of output power, transmission on MCR-WPT system are obtained by circuit theory calculation, such as the compensation capacitor of capacitance, the factor of quality, coil, the resonant frequency. Then with the aid of theoretical calculation and simulation analysis, the system transmission performance and various influence factors of internal law is got, then we put forward several feasible schemes of improving the efficiency of transmission system.Completing test prototype design, this paper is determined by means of experime- ntal verification with conclusions of circuit calculation, the simulation analysis in front of the scientific nature, for a more optimization design of the MCR-WPT, the resona-nce capacitance parameter, frequency and load resistance system parameters is synthe-sized.