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Journal of Sensors
Volume 2018, Article ID 5831056, 7 pages
https://doi.org/10.1155/2018/5831056
Research Article

Development and Application of Wireless Power Transmission Systems for Wireless ECG Sensors

1Department of Biomedical Engineering, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
2Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea

Correspondence should be addressed to Jong-Ha Lee; moc.liamg@grebeges

Received 11 September 2017; Revised 15 November 2017; Accepted 29 November 2017; Published 12 February 2018

Academic Editor: Oleg Lupan

Copyright © 2018 Jin-Chul Heo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigated the variations in the magnetic field distribution and power transmission efficiency, resulting from changes in the relative positions of the transmitting and receiving coils, for electromagnetic induction-type wireless power transmission using an elliptical receive coil. Results of simulations using a high-frequency structure simulator were compared to actual measurement results. The simulations showed that the transmission efficiency could be maintained relatively stable even if the alignment between the transmitting and receiving coils was changed to some extent. When the centre of the receiving coil was perfectly aligned with the centre of the transmitting coil, the transmission efficiency was in the maximum; however, the degree of decrease in the transmission efficiency was small even if the centre of the receiving coil moved by ±10 mm from the centre of the transmitting coil. Therefore, it is expected that the performance of the wireless power transmission system will not be degraded significantly even if perfect alignment is not maintained. Animal experiments confirmed good ECG signals for the simulation conditions. The results suggested a standardized application method of wireless transmission in the utilization of wireless power for implantable sensors.