Schormans, M;
Valente, V;
Demosthenous, A;
(2016)
Frequency Splitting Analysis and Compensation Method for Inductive Wireless Powering of Implantable Biosensors.
Sensors
, 16
(8)
, Article 1229. 10.3390/s16081229.
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Abstract
Inductive powering for implanted medical devices, such as implantable biosensors, is a safe and effective technique that allows power to be delivered to implants wirelessly, avoiding the use of transcutaneous wires or implanted batteries. Wireless powering is very sensitive to a number of link parameters, including coil distance, alignment, shape, and load conditions. The optimum drive frequency of an inductive link varies depending on the coil spacing and load. This paper presents an optimum frequency tracking (OFT) method, in which an inductive power link is driven at a frequency that is maintained at an optimum value to ensure that the link is working at resonance, and the output voltage is maximised. The method is shown to provide significant improvements in maintained secondary voltage and system efficiency for a range of loads when the link is overcoupled. The OFT method does not require the use of variable capacitors or inductors. When tested at frequencies around a nominal frequency of 5 MHz, the OFT method provides up to a twofold efficiency improvement compared to a fixed frequency drive. The system can be readily interfaced with passive implants or implantable biosensors, and lends itself to interfacing with designs such as distributed implanted sensor networks, where each implant is operating at a different frequency.
| Type: | Article |
|---|---|
| Title: | Frequency Splitting Analysis and Compensation Method for Inductive Wireless Powering of Implantable Biosensors |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3390/s16081229 |
| Publisher version: | http://doi.org/10.3390/s16081229 |
| Language: | English |
| Additional information: | c 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Science & Technology, Physical Sciences, Technology, Chemistry, Analytical, Electrochemistry, Instruments & Instrumentation, Chemistry, frequency splitting, frequency tuning, implantable biosensors, inductive link, inductive powering, medical implants, wireless power transfer, DESIGN, STIMULATION, TELEMETRY, BRAIN, LINKS, COILS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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/1508446 |
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