心脏起搏器无线供能线圈偏移效率优化研究

Optimization research on cardiac pacemaker wireless charging coil offset efficiency

针对植入式心脏起搏器进行无线充电时线圈相对位置发生偏移而导致传输效率下降的问题,本文设计了一种抗线圈偏移的基于E类逆变器的S-S型谐振式无线供能效率优化系统。使用阻抗变换与相角调制的方法,结合E类逆变器的宽阻抗宽相角特性,以减少线圈偏移的影响,使系统依然具有较高的传输效率。采用多物理场耦合分析方法,建立二维平面模型,通过COMSOL对系统进行电磁和温度安全评估。搭建实验平台,研究了线圈偏移情况下系统的功率和效率。仿真与实验结果表明:偏移情况下,系统的工作效率范围在73.6%~83%之间,体内植入部分最高温升为1.4℃,各项安全评估指标均满足相关规定。

In order to solve the problem that the relative position of the coil is shifted when the implantable cardiac pacemaker is charged wirelessly, which leads to the decrease of transmission efficiency, a kind of S-S resonant wireless energy supply efficiency optimization system based on class E inverter is designed.The impedance transformation and phase angle modulation are used, and the wide impedance and wide phase angle characteristics of class E inverter are combined to reduce the influence of coil offset, so that the system still has high transmission efficiency.The two-dimensional plane model is established by using the coupling analysis method of multi physical fields.The electromagnetic and temperature safety of the system is evaluated by COMSOL.The experimental platform is built to study the power and efficiency of the system with coil offset.The simulation and experimental results show that the working efficiency of the system ranges from 73.6 % to 83 %,and the maximum temperature rise of the implanted part is 1.4 ℃.All safety evaluation indexes meet the relevant requirements.