| With the development of our society,more and more portable medical devices,implantable artificial equipment,miniature wearable equipment are widely used.Wireless power transmission(WPT)is an electrical transmission mode without the direct contact of the power supply to the load,which can effectively overcome the traditional transmission way as well as more conveniently and flexibility.However,the frequency detuning is an unavoidable problem for the process of WPT,and seriously affected the transfer efficiency of the system.In this paper,a micro WPT system was built based on the mechanism of CMT with the ability of self-turning confirmatory analysis.The main contents include the followings:1.The two models for magnetic coupling resonant were theatrically analyzed.Analyzed the wireless power transmission of two kinds of theory model via magnetic coupling resonant.According to coupled mode theory,the paper analyzed the correlation of transmission efficiency of WPT system,the coupling strength and the coupling.Otherwise,the frequency characteristic of WPT system were studied.It indicated that the resonance frequency of system can track quickly.Thus it can optimize the transmission efficiency of system.2.Adjusted the resonance frequency of the WPT system for micro wearable devices.The system mainly included the high-frequency signal generator,ultrasonic distance measurement circuit,single-chip microcomputer control system,information display circuit,power amplifier,resonance coil and load.3.For mismatch phenomenon to the system caused by the change of the resonant coil spacing,analyzed the impedance matching of system effects on transmission power,transmission efficiency and frequency division.4.Designed the self-turning of wireless transmission system for confirmatory analysis.It showed that the resonance frequency of system can track quickly,and effectively avoid frequency-splitting.Therefore,it can improve the transmission efficiency and increase output power. |
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