心脏起搏器谐振式无线供能LCL-LCL的集成

Integration of Resonant Wireless Energy Supply LCL-LCL for Cardiac Pacemaker

为减小植入式心脏起搏器无线充电系统的体积及电磁干扰,该文设计一种工作频率为150kHz的两端串并联(LCL-LCL)补偿集成式磁耦合谐振式无线供能系统。将谐振线圈取代电感集成到主线圈上;首先建立线圈模型并进行优化,分析匝数与匝间距对线圈互感的影响规律,设计一种耦合系数最佳的圆角方形线圈;然后对比集成式与非集成式结构系统的传输效率,验证了此结构在效率和体积更具优势;最后通过模拟三维人体组织,计算比吸收率和温升以及电磁场强度,进一步评估植入式充电系统的可行性和安全性。实验结果表明,在线圈中心对齐相距8mm的条件下,系统传输效率可达73%,比非集成式结构提升了15%,最大温升仅为1.2℃。

In order to reduce the volume and electromagnetic interference of the wireless charging system of the implantable pacemaker,a wireless power supply system with a series parallel(LCL-LCL)compensation integrated coupling structure and working frequency of 150kHz was designed based on the principle of magnetic coupling resonance.The resonant coil was integrated into the main coil instead of the inductance.Firstly,the coil model was established and optimized,and the influence of turn number and turn spacing on coil mutual inductance was analyzed.Accordingly,a rounded square coil with the best coupling coefficient was designed.Then,the transmission efficiency of the integrated system and the non-integrated structural system was compared,and the advantages of this structure in efficiency and volume were verified.The feasibility and safety of the implantable charging system were further evaluated by simulating three-dimensional human tissue,calculating the specific absorption rate,temperature rise and electromagnetic field intensity.The experimental results show that the transmission efficiency of the system can reach 73%when the coil center is aligned 8mm apart,which is 15%higher than that of the non integrated structure,and the maximum temperature rise is only 1.2℃.