Modeling and Experimental Validation of a Butterfly-Shaped Wireless Power Transfer in Biomedical Implants
Modeling and Experimental Validation of a Butterfly-Shaped Wireless Power Transfer in Biomedical Implants
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DOI：
10.1109/access.2019.2933260
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发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Seo, Chulhun
中科院分区：
文献类型：
--
作者：
Ha-Van, Nam;Seo, Chulhun
无线电力传输（WPT）为生物医学植入物提供了一种安全可靠的供电方法。WPT系统的量程和失调容限限制是导致传输效率下降的主要因素。特别地，植入装置是不可见的并且难以布置成与发射线圈对准。本文提出了一种用于生物医学植入物的磁共振WPT系统的蝶形发射（BS-Tx）线圈。验证和分析了具有改变的驱动电流方向（平行和反平行电流方向）的BS-Tx线圈原型。此外，一个耦合两线圈系统的等效电路模型与匹配网络的最佳电容对的方法，数学推导，以获得最大的功率传输效率。BS-Tx线圈提高了系统在距离、角度和轴向未对准公差方面的效率。一个实际的WPT系统的制作和测量，以验证通过真实的生物组织的传输效率，并表现出显着的效率提高。最后，一个假设的背景下，视网膜假体的应用被证明是一个潜在的应用，视网膜植入物。所提出的系统显示出低的比吸收率，这满足人体安全法规。
Wireless power transfer (WPT) presents a safe and robust method for powering biomedical implants. The range and misalignment tolerance restrictions of the WPT system are the main factors, conducive to the transfer efficiency degradation. Especially, the implanted device is invisible and difficult to arrange in alignment with the transmitting coil. This paper proposes a butterfly-shaped transmitting (BS-Tx) coil of a magnetic resonance WPT system for biomedical implants. The BS-Tx coil prototypes with the changing driven current directions, parallel and anti-parallel current directions, are verified and analyzed. Besides, an equivalent circuit model of a coupling two-coil system with an optimal pair of capacitors method for the matching network is mathematically derived to obtain the maximized power transfer efficiency. The BS-Tx coil enhances the efficiency of the system in the distance, angle, and axial misalignment tolerances. A practical WPT system is fabricated and measured to verify the transfer efficiency through the real biological tissue and exhibits a significant efficiency improvement. Finally, a hypothetical context of retinal prosthesis application is demonstrated as a potential application to retinal implants. The proposed system shows a low specific absorption rate, that is satisfied the human safety regulations.