Open AccessInterference‐free wireless power transfer system for biomedical implants using multi‐coil approach
Author(s) -
RamRakhyani A.K.,
Lazzi G.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.0567
Subject(s) - wireless power transfer , electromagnetic coil , electrical engineering , maximum power transfer theorem , wireless , electromagnetic interference , power (physics) , electronic engineering , engineering , acoustics , telecommunications , physics , quantum mechanics
Low‐frequency (1–20 MHz) inductive coupling is a leading technique to power biomedical implants wirelessly. Even though these are non‐radiating systems, the external and the implant coils can cause sufficient radiated electric field to exceed the federal standards for communication. A multi‐coil‐based wireless power transfer (WPT) technique is developed to selectively control the currents in the external and implant coils to reduce the radiated electric field. A four‐coil WPT system, which can achieve more than 37% reduction in the radiated electric field as compared with a two‐coil WPT system with the same dimensions and design constraints, is implemented and used to demonstrate the effectiveness of the proposed approach.