基于多频磁负超材料的心脏起搏器无线供能研究  

Wireless Energy Supply for Cardiac Pacemaker Based on Multi-Band Magnetic Negative Metamaterial

作　　者：陈伟华[1] 黄雨琦 闫孝姮[1] 宋佳伟 Chen Weihua;Huang Yuqi;Yan Xiaoheng;Song Jiawei(Faculty of Electrical and Control Engineering,Liaoning Technology University,Huludao 125000,China)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,葫芦岛125000

出　　处：《电工技术学报》2024年第16期4931-4943,共13页Transactions of China Electrotechnical Society

基　　金：2020年辽宁省教育厅科学研究青年科技人才“育苗”项目(LJ2020QNL019);2023年辽宁省教育厅科学技术研究面上项目《基于磁负超材料的心脏起搏器无线供能系统传输特性研究》(JYTMS20230815)资助。

摘　　要：针对植入式心脏起搏器无线供能系统频率变化发生共振失调导致传输效率低等问题,该文提出一种基于多频磁负超材料(MB-MNG)的心脏起搏器无线供能系统。首先,根据磁负超材料等效介质理论,推导了正八边形超材料设计的基本公式,建立了MB-MNG基元模型;其次,以S-S结构为例,通过仿真和实验研究了6.78 MHz、8.94 MHz和13.56 MHz频段下系统传输效率;再次,为了研究可靠性,讨论了系统与MB-MNG之间的错位情况;最后,为确保安全性,使用多物理场仿真软件研究系统的电磁安全特性,并进行温升实验。实验结果表明:在三工作频段下,基于MB-MNG的WPT系统的输出功率为3.29W、2.77W和2.87W,与传统WPT系统和加入铁氧体薄板WPT系统对比,传输效率提高了24.6%~36.5%。同时,在系统发生偏移时,仍能保持30.73%~48.41%的传输效率;60 min充电测试内组织SAR值及最大温升均符合安全标准。Magnetic coupled resonant wireless power transfer(MCR-WPT)technology is a safer choice for powering implanted medical devices.However,MCR-WPT systems incorporating traditional metamaterials usually work at a fixed single frequency.When the system operating frequency changes,frequency detuning and electromagnetic leakage are prone to occur.,reducing transmission efficiency.Based on the above problems,this paper designs a multi-frequency magnetic negative metamaterial used in implantable cardiac pacemakers'wireless energy supply system.Adjusting the patch capacitance connected in the elementary coil can realize the operation at 6.78 MHz,8.94 MHz,and 13.56 MHz multi-frequency reduces the impact of frequency detuning,ensuring higher working efficiency while avoiding magnetic field leakage.First,based on the equivalent medium theory of magnetic negative metamaterials,the basic formula for the design of regular octagonal metamaterials was deduced,the multi-band magnetic negative metamaterial(MB-MNG)primitive model was established,the parameters of the metamaterial primitives were determined,and the lumped capacitance value of the series connection between the primitives was determined.The metamaterial primitives have special electromagnetic properties at multiple operating frequencies of 6.78 MHz,8.94 MHz,and 13.56 MHz,changing the direction of the passing magnetic field,laying a theoretical foundation for metamaterials to achieve negative refraction.Secondly,taking the S-S structure as an example,simulation verified that the equivalent magnetic permeability of the metamaterial element in the 6.78 MHz,8.94 MHz,and 13.56 MHz frequency bands is negative and the direction of the magnetic field changes.The designed multi-frequency magnetic negative metamaterial is added to the MCR-WPT system and the magnetic field distribution of the traditional MCR-WPT system is comparatively studied.The simulation results show that after adding the multi-frequency magnetic negative metamaterial array,the transmission efficiency under the

关 键 词：无线供能系统 多频磁负超材料 心脏起搏器 传输性能 

分 类 号：TM724[电气工程—电力系统及自动化]