Piezoelectric Wireless Power Transfer Using a Halbach Array for the Internet of Implanted Things

Hailing Fu*, George Gibson, Zhuowen Liu, Boli Chen, Maobin Lu, Chen Chen, Dong Jiang, Nikolaos A. Chrysochoidis, Fang Deng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Implanted devices are increasingly used in chronic disease monitoring, but face challenges in energy autonomy. This article presents a novel wireless power transfer (WPT) method for self-sustained medical implants using Halbach array-based magnetic plucking and piezoelectric transduction. The wearable-implantable coupled system consists of a piezoelectric receiver within the implant to receive power and a near-field magnetic power transmitter as a wearable device. To deliver power over greater distances through the human body, the transmitter features a rotating magnetic Halbach array powered by a miniature motor, or by human motion, to generate an alternating magnetic field. The use of low-frequency rotating magnetic fields periodically excites a cantilevered piezoelectric beam with a tip magnet to realize WPT. A theoretical model that includes magnetic coupling, piezoelectric transduction and receiver beam dynamics has been established to study the electro-magneto-mechanical dynamics of this WPT system. The effectiveness of the Halbach array for extended power transfer is examined through theoretical modeling and numerical simulation, showing a 37.2% enhancement of the magnetic forces. A prototype was also fabricated and tested to examine the WPT performance. The established wireless power link can provide sufficient power (∼ 32 μ W) over a large transmission distance (22 mm), providing a potential battery-free solution for the self-sustained Internet of Implanted Things (IoIT) for personalized healthcare.

Original languageEnglish
Pages (from-to)41049-41060
Number of pages12
JournalIEEE Internet of Things Journal
Volume11
Issue number24
DOIs
Publication statusPublished - 2024

Keywords

  • Halbach array
  • implantable medical devices
  • Internet of Implanted Things (IoIT)
  • magnetic plucking
  • piezoelectric transducers
  • self-sustained sensing
  • wireless power transfer (WPT)

Fingerprint

Dive into the research topics of 'Piezoelectric Wireless Power Transfer Using a Halbach Array for the Internet of Implanted Things'. Together they form a unique fingerprint.

Cite this