Research On Transcutaneous Wireless Power Supply System

At present,human implantable medical devices have been widely used.Transcutaneous wireless power supply system can wirelessly power implanted devices.It effectively solves the problems of skin infection and cable breakage caused by the traditional power supply method of tow cable power supply,and the problem of secondary surgery of battery replacement in the body.Therefore,this technology is getting more and more attention in the field of implantable medical devices.In this paper,the transcutaneous wireless power supply system is studied with the research object of artificial heart transcutaneous wireless power supply system.An energy injection frequency conversion constant voltage control method is proposed.Meanwhile,the human tissue simulation model is used to verify the biological safety results of the system.The paper first introduces the background and significance of transcutaneous wireless power supply,and elaborates the current domestic and foreign research results on transcutaneous wireless power supply with five aspects which include system inverter topology,compensation structure,rectifier topology,coil structure and system characteristics.The researches of constant voltage output control method and biological safety of wireless power supply system are discussed.Then the work principle analysis and mathematical modeling of the transcutaneous wireless power system are carried out.The influence of circuit parameter changes on the transmission characteristics of the system is studied,and the calculation method of coil inductance and mutual inductance is made.Based on this,an energy injection frequency conversion constant voltage control method is proposed and theoretically derived.The inverter is controlled to make the system achieve the efficiency optimization and constant voltage output at the same time.Simulation experiment is carried out using Matlab / Simulink simulation software,and the simulation results have verify the effectiveness of the control method.At the same time,the human tissue model is established using Comsol simulation software,and the simulation results have verify the biological safety of the system.Finally,STM32F103C8T6 is used to build the system experimental platform and a series of verification experiments are performed.The experimental results show that the proposed scheme can improve the system efficiency and output constant voltage when the load and mutual inductance change,and it can realize the charging and discharging of the internal battery.