Efficient inductive powering of brain implanted sensors

2015 IEEE Sensors Applications Symposium (SAS) Pub Date : 2015-04-13 DOI:10.1109/SAS.2015.7133583

Sebastian Stoecklin, T. Volk, A. Yousaf, J. Albesa, L. Reindl

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引用次数: 7

Abstract

This paper describes a size and tissue absorption based comprehensive approach to optimize a pair of coils for the purpose of wireless powering of brain implanted sensors. In the first step, the optimum transmission frequency is determined by considering tolerable coil size, power transmission efficiency and tissue absorption effects. After modeling the important quantities at the frequency of interest, a numerical analysis is performed, revealing a set of coils suitable for efficient inductive powering. This numerical analysis was verified by both FEM simulation and concluding measurements. All simulations account for the layered structure of the human head, modeling the dielectric properties with Cole-Cole dispersion effects. Furthermore, a strategy of boosting power transmission efficiency is covered in simulation and measurement, particularly the application of a ferrite shielding to the transmission coil. In consequence, a link efficiency of 80% at a coil separation distance of 5mm and 20% at 20 mm using a 10mm planar receiving coil can be achieved, contributing to a higher integration density of multi-channel brain implanted sensors.

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大脑植入传感器的高效感应供电

本文描述了一种基于尺寸和组织吸收的综合方法来优化一对线圈，用于大脑植入传感器的无线供电。在第一步中，通过考虑可容忍线圈尺寸、功率传输效率和组织吸收效应来确定最佳传输频率。在对感兴趣频率上的重要量进行建模后，进行数值分析，揭示了一组适合于高效感应供电的线圈。数值分析得到了有限元模拟和总结性测量结果的验证。所有的模拟都考虑了人类头部的分层结构，模拟了具有Cole-Cole色散效应的介电特性。此外，还在仿真和测量中讨论了提高功率传输效率的策略，特别是在传输线圈中应用铁氧体屏蔽。因此，使用10mm平面接收线圈，在线圈分离距离为5mm时可以实现80%的链路效率，在20mm时可以实现20%的链路效率，有助于提高多通道脑植入传感器的集成密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 IEEE Sensors Applications Symposium (SAS)

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