植入式集成磁耦合谐振无线电能传输和电源管理研究

The power supply is one of the bottle necks of reducing the size and improving the security of the Implantable Medical Devices (IMD) which play a more and more important role in disease treatment, health monitoring and awareness on the human body and organisms. In this project, in order to improve the power transmission efficiency, the magnetic resonance-based wireless power transmission method will be used; in order to reduce the size, the receiving coils are integrated with the power management circuits together. A prototype of integrated magnetic resonance-based wireless power transmission IMD will be realized by studying the following contents: the study on the theoretical models of the wireless power transmission, the methods of improving the PCB coils and integrated coils' quality factor and inductance value to improve the transmission efficiency; the design of low-power rectifier and voltage doubler, which will be selected automatically in accordance with the received voltage magnitude to solve the contradiction between the stability and efficiency of the wireless power transmission; the study on the impact of the radiation on the human body, etc. The prototype will realize mWs-order power transmission and a 3.3V stable power supply output for the subsequent signal acquisition and processing circuits. Through this project, the problem of high-efficiency, safety and stable power supply in miniaturized IMD will be broken through.

植入式医疗器件在疾病治疗、健康监测、提高对人体自身和生物体认识等方面的作用越来越重要，但是植入式器件的供电是限制其往更小、更安全方向发展的瓶颈之一。本项目拟采用磁耦合谐振无线电能传输方式，替代传统的电感耦合方式来达到更高的传输效率；采用无线电能接收线圈与低功耗电源管理电路集成在一起的方式，减小植入式器件的尺寸。通过研究磁耦合谐振无线电能传输的理论模型,提高PCB线圈和集成线圈品质因数和电感值的方法，提高传输效率；设计低功耗整流器、电压倍增器，并且根据接收电压大小，自动选择整流器或电压倍增器，解决传输稳定性和效率的矛盾；研究无线电能传输辐射对人体的影响等内容，最终实现一个可用于植入式器件的集成磁耦合谐振无线电能传输原型，实现毫瓦量级的无线能量接收，给后续信号获取、处理电路提供3.3V稳定电源电压。通过本项目研究，有望从理论上和技术上突破当前植入式器件微型化、高效率、安全、稳定电源供电的难题。

针对植入式医疗器件供电的无线供电的问题，我们对磁耦合谐振无线电能传输系统的电路模型、线圈间耦合系数的计算和优化、线圈尺寸结构优化和最优频率选择，以及可实现各向均匀无线输电平台设计等方面展开了深入研究，得到了完整的四线圈磁耦合谐振系统的完整电路模型和针对植入式器件无线供电的简化模型；在线圈互感计算方面得到了比传统Greenhouse更简单的解析解和任意位置情况下互感计算方法；在植入线圈毫米尺寸限制下，通过对solenoid形式线圈的解析建模，得到了最大化传输效率的最优几何结构和工作频率，通过对平面线圈的解析建模得到了优化平面线圈尺寸的解析优化模型；为实现均匀磁场的产生，提出了并联型线圈和三层三相线圈阵列的设计方法。. 经过此项目的研究，对通用的植入式医疗器件无线供电，以及专用的脑机接口、植入式神经信号记录器件无线供电的传输效率的提升方面做出了贡献，推动了无线电能传输技术的发展。研究团队在IEEE Trans. MTT等期刊上共发表（含接收）SCI论文2篇（另有一篇IEEE Trans. MAG论文未标注基金号，因此未统计在内），国际会议论文3篇，其他期刊论文2篇，授权发明专利2项，培养研究生3人。