Wireless Power Transfer Based on 3-Coil Magnetic Resonance Coupling for Biomedical Implants

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Abstract

Electronic biomedical implants rely on wireless power transfer (WPT) systems to remove their dependency on chemical batteries to avoid potential safety issues. As traditional systems based on the inductive link are limited by their transmission distance, the magnetic resonance coupling (MRC) method for WPT has been proposed to increase the delivered power for mid-range applications. In this paper, we design a 3-coil magnetic resonant WPT system with a small power receiver for micro biomedical implants and evaluate its power transfer capability with a pork steak to mimic the attenuation caused by biological tissues. Operating at 180 kHz, the output of the proposed system can supply 56 mW at 3.3 V for an implanted receiver at a distance of 80 mm, which is 1.5 times more efficient than the traditional 2- coil system under the same conditions. Such a result demonstrates the applicability and improvement of the MRC-WPT system for powering up in-body biomedical devices.
Original languageEnglish
Title of host publication2021 IEEE MTT-S International Wireless Symposium (IWS)
Number of pages3
PublisherIEEE
Publication date2021
Article number9499617
ISBN (Print)978-1-6654-3528-4
ISBN (Electronic)978-1-6654-3527-7
DOIs
Publication statusPublished - 2021
Event2021 IEEE MTT-S International Wireless Symposium (IWS) - Nanjing, China
Duration: 23 May 202126 May 2021

Conference

Conference2021 IEEE MTT-S International Wireless Symposium (IWS)
Country/TerritoryChina
CityNanjing
Period23/05/202126/05/2021

Keywords

  • Wireless power transfer
  • Magnetic resonance coupling
  • biomedical implants

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