Fu, Hailing;
Gibson, George;
Liu, Zhuowen;
Chen, Boli;
Lu, Maobin;
Chen, Chen;
Jiang, Dong;
... Deng, Fang; + view all
(2024)
Piezoelectric Wireless Power Transfer using Halbach Array for the Internet of Implanted Things.
IEEE Internet of Things Journal
(In press).
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Abstract
Implanted devices are increasingly used in chronic disease monitoring, but face challenges in energy autonomy. The paper presents a novel wireless power transfer method for self-sustained medical implants using Halbach array-based magnetic plucking and piezoelectric transduction. The wearableimplantable 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 wireless power transfer. A theoretical model that includes magnetic coupling, piezoelectric transduction and receiver beam dynamics has been established to study the electromagneto-mechanical dynamics of this wireless power transfer system. The effectiveness of the Halbach array for extended power transfer is examined through theoretical modelling and numerical simulation, showing a 37.2% enhancement of the magnetic forces. A prototype was also fabricated and tested to examine the wireless power transfer performance. The established wireless power link can provide sufficient power (∼32 µW) over a large transmission distance (22 mm), providing a potential batteryfree solution for the self-sustained Internet of Implanted Things (IoIT) for personalized healthcare.
| Type: | Article |
|---|---|
| Title: | Piezoelectric Wireless Power Transfer using Halbach Array for the Internet of Implanted Things |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Wireless power transfer, implantable medical devices, Halbach array, piezoelectric transducers, self-sustained sensing, magnetic plucking, Internet of Implanted Things |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10196740 |
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