| Magnetically-coupled resonant wireless power transfer(MCR-WPT)technology has developed rapidly in the field of electric energy wireless transmission by virtue of its flexibility,convenience,and efficiency.As a stable and reliable wireless power supply method,it has greatly promoted the development and application of implantable medical equipment.In this paper,a wireless power transmission system with an asymmetric coupling mechanism is designed for an implantable artificial heart power supply device to complete the energy transmission from the external coupling mechanism to the internal coupling mechanism.The asymmetric coupling mechanism can be used when the size of the implanted receiving coil is limited.By increasing the size of the transmitting coil,the coupling capability between the two coils is enhanced,thereby improving the transmission performance of the system.The design in this article has a great role in promoting the application and development of implantable artificial hearts.Firstly,this article analyzes the basic principles of magnetic field and circuit of asymmetric wireless power transmission,and puts forward performance indicators for artificial heart function devices,and deduces the power transmission efficiency and output power of the system from coupled mode theory and circuit theory.The expression of magnetic induction intensity and mutual inductance formula are derived through magnetic theory,and the influence of the position of the asymmetric coupling mechanism of the system on the mutual inductance in different situations is analyzed,and theoretical analysis and simulation verification are carried out.Secondly,the design of the experimental prototype is carried out for the performance index parameters of the artificial heart power supply system,including software circuits and hardware circuits,including software control circuits,drive circuits,isolation circuits,inverter main circuits and asymmetric coupling mechanisms.Finally,an experimental platform was built to conduct electromagnetic co-simulation of asymmetric resonant radio energy transmission,to establish the feasibility of the scheme,and to carry out experimental verification.The output power of the prototype is 20 W,and the transmission efficiency reaches 80%.It is verified through simulation that the Specific Absorption Rate(SAR)value of the electromagnetic wave generated by the prototype coupling mechanism on the human body meets the international standard,and the impact of the lateral offset distance on the system transmission efficiency is studied through simulation and experiment.The research on wireless power transmission of equipment is of positive significance. |
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