Design and optimization of a 3-coil resonance-based wireless power transfer system for biomedical implants

Type
Article

Authors
Yi, Ying
Buttner, Ulrich
Fan, Yiqiang
Foulds, Ian G.

KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program

Online Publication Date
2014-09-15

Print Publication Date
2015-10

Date
2014-09-15

Abstract
This paper presents a resonance-based wireless power transfer system using a single layer of inductor coil windings, in a pancake configuration, in order to obtain a compact system for implantable electronic applications. We theoretically analyzed the system and characterized it by measuring its inductance, self-resonant frequency, and quality factor Q. In our resonance-based wireless power transfer prototype, we proposed a 3-coil system, using two 15-mm radius implantable coils, with a resonance frequency of 6.76MHz. This system can effectively transfer power for a distance of up to 50mm. Moreover, our proposed 3-coil system can achieve a high Q-factor and has a comparable power transfer efficiency (PTE) to previously reported works about 3-coil and 4-coil systems. The experimental PTE can achieve 82.4% at a separation distance of 20mm and more than 10% PTE at a distance of 40mm.

Citation
Yi, Y., Buttner, U., Fan, Y., & Foulds, I. G. (2014). Design and optimization of a 3-coil resonance-based wireless power transfer system for biomedical implants. International Journal of Circuit Theory and Applications, 43(10), 1379–1390. doi:10.1002/cta.2024

Publisher
Wiley

Journal
International Journal of Circuit Theory and Applications

DOI
10.1002/cta.2024

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