| The power supply requirements of human implantable devices are strict,and providing a durable,stable,safe and efficient charging mode is an important issue affecting the development of human implantable devices.In order to solve this problem,a human implantable wireless power transmission system based on ultrasonic coupling is proposed,and the system is studied in this paper.Firstly,from the point of view of sound field,the "surface-surface" model of far-field in human tissue environment is established,and the propagation characteristics of ultrasonic power in sound field are analyzed.On this basis,the main factors affecting the transmission of ultrasonic energy in the system are discussed.Secondly,the equivalent circuit model of the ultrasonic coupled wireless power transmission system is constructed based on the principle of electromechanical equivalence.By analyzing the efficiency of the circuit,the method of impedance matching is proposed to improve the transmission efficiency of the system,and the impedance matching strategy of the transmitter and the receiver transducers is studied.At the same time,COMSOL finite element simulation software is used to simulate the sound field model of the ultrasonic coupling wireless power transmission system,and Saber circuit simulation software is used to study the influence of impedance matching on the transmission efficiency of the system.Finally,the effects of propagation distance,frequency and excitation on ultrasonic power in sound field are further verified by experiments.The feasibility of impedance matching is verified by comparing the transmission efficiency of the system before and after impedance matching.The research of implantable ultrasonic coupling wireless power transmission system for human body provides an effective reference for its future development and application. |
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