Research On A Wireless Power Transfer System Based On Coupled Magnetic Resonance

The technology of wireless power transmission based on coupled magnetic resonance is a new way of energy transfer. Tt is also very hot for the scientific institutions in the recent years. To realize the wireless transmission of power, the principle of coupled magnetic resonance is principally used in this technology. Comparing with the traditional wired transmission of electric power, the new technology can not only save the cost of materials but also improve the safety of the using of electri-city. It also has many advantages, such as long transmission distance, high transmission efficiency and the transmission power and transmission direction is not restricted. So the technology of wireless power transmission based on coupled magnetic resonance has a good research value and broad application prospects.According to the research and analysis of the basic theory of the technology of wireless power transmission based on coupled magnetic resonance in this paper, the overall structure framework and equivalent circuit model of the wireless power transmission system arc built. The theory of coupled-mode and circuit arc applied in the analysis of the system. And the transmission characteristics and inherent law of the system is revealed according to the analysis of the basic working principle and energy transmission channel of the system.In the analysis of factors affecting the wireless power transmission based on coupled magnetic resonance, the way of structure compensation, the resonant frequency, quality factor, the resonant coil and the relationship between compensation capacitor and power transmission efficiency and the distance, the output power has been studied. And the effective way to improve the three is presented:1. Improve the parameters of the coil;2. Choose the appropriatet means of compensation structure resonance loop based on the practical application;3. Increase the resonance frequency and quality factor reasonably.A system of wireless power transmission based on coupled magnetic resonance has been designed in this paper. The system mainly consists of high frequency inverter and rectifier filter. The selection of the drive chip and power switch tube of the high-frequency half bridge inverter circuit has been introducted in detaiLAccording to the simulation of the waveform of the half bridge high frequency square wave signal from the inverter circuit, the MOS switch tube grid and the source of the driving signa and the energy transmission part.The detailed analysis to the result of the experiment verify the feasibility of this device. According to the simulation of wireless, power, if power supply distance increases, the output power and efficitney of the system will reduce. And the experiental resu-lts and theoretical analysis are basically identical, it proves the rationality of the design and the correctness of the analysis of the theory.Further, in this paper,simulation of the relationship between transverse resonance coil distance and transport efficiency, load power. Simulation of the relationship between the receiving coil rotation angle and transmission efficiency, load power. To verify the stability and reliability of the system.