| Magnetic resonance wireless power transmission technology has the advantages of medium transmission distance,high efficiency and no radiation.It has high practical value and economic value in the field of consumer electronics and industrial application.In this paper,the transmission characteristics of magnetic resonance WPT system are analyzed,and the spiral resonant coil and experimental setup are designed and simulated and verified by experiments.The main works of this paper are:1.The transmission principle is analyzed and the system is modeled,including the analysis of magnetic field between resonant coils and the modeling of the two-coil and the four-coil system by the circuit mutual inductance theory.2.The transmission characteristics of WPT system with respect to efficiency and frequency splitting are analyzed.And a four-coil matching adjustment method with class-E source to maintain high efficiency is proposed to improve the effect of distance and load variation.3.The spiral resonant coil is designed.In addition to the overall design of the magnetic resonance WPT system,the design method of spiral coil in four-coil system is presented in detail,and the coil parameters are tested.4.The experimental setup is built and experimental research is carried out.Two-coil system based on half-bridge inverter circuit and four-coil system based on class-E inverter circuit are designed respectively.And the transmission characteristics of WPT system are verified experimentally. |
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