Design and Optimization of Inductive Coils for 2FSK-based Power and Data Transmission for Biomedical Implants

2022 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS) Pub Date : 2022-11-11 DOI:10.1109/APCCAS55924.2022.10090401

Wending Qi, Anning Liu, Ruolin Zhou, Songping Mai

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Abstract

The next-generation of neural prostheses such as optogenetic cochlear implants (CIs) can be implemented by a 2FSK-based wireless power and data transfer (WPDT) system over a signal inductive link. Optimizing the power efficiency of the link is imperative to minimize the heating dissipation in tissue and interference with other devices. And to mimic natural auditory perception with high fidelity, data rate is also important. Previous design methodologies for coils are not comprehensive and accurate enough to account for data transmission and operation at dual carrier frequencies. We outline the theoretical foundation of optimal power transmission and compromise it with data transmission. We use this foundation to propose an iterative dual frequencies coils (DFC) design procedure for 2FSK-based WPDT system. Moreover, we execute this procedure at 3.951 and 4.516 MHz achieving power transfer efficiency (PTE) and power deliver to the load (PDL) of 77.4% and 230.25mW respectively, and the data rate reaches 564 Kbps, at 12mm spacing. All results are verified with simulations using MATLAB and measurements using helical coils fabricated on printed circuit boards.

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基于2fsk的生物医学植入物功率和数据传输电感线圈的设计与优化

下一代神经假体如光遗传人工耳蜗(CIs)可以通过基于2fsk的无线电源和数据传输(WPDT)系统在信号感应链路上实现。优化链路的功率效率是必要的，以尽量减少组织中的散热和对其他设备的干扰。而要高保真地模仿自然听觉感知，数据速率也很重要。以前的线圈设计方法不够全面和准确，不足以考虑双载波频率下的数据传输和操作。我们概述了最优功率传输的理论基础，并将其与数据传输折衷。在此基础上，我们提出了基于2fsk的WPDT系统的迭代双频线圈(DFC)设计方法。此外，我们在3.951 MHz和4.516 MHz下执行该程序，分别实现了77.4%和230.25mW的功率传输效率(PTE)和功率传递到负载(PDL)，数据速率达到564 Kbps，间距为12mm。所有结果都通过MATLAB仿真和印刷电路板上螺旋线圈的测量进行了验证。

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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2022 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

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