Journal of the Institute of Convergence Signal Processing (융합신호처리학회논문지)

The Korea Institute of Convergence Signal Processing (한국융합신호처리학회)
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Development and Application of Wireless Power Transmission Systems for Wireless ECG Sensors

지속적인 심장질환 모니터링을 위한 인체 삽입형 생체 센서의 무선전력전송 시스템

  • Heo, Jin-Chul (Department of Biomedical Engineering, School of Medicine, Keimyung University) ;
  • Lee, Jong-Ha (Department of Biomedical Engineering, School of Medicine, Keimyung University)
  • 허진철 (계명대학교 의과대학 의용공학과) ;
  • 이종하 (계명대학교 의과대학 의용공학과)
  • Received : 2019.06.14
  • Accepted : 2019.06.29
  • Published : 2019.06.30
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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 the maximum; however, the degree of decrease in the transmission efficiency was small even if the centre of the receiving coil moved by ± 10mm 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. The results suggested a standardized application method of wireless transmission in the utilization of wireless power for implantable sensors.

전자기 유도형 무선전력전송에서는 송신 코일과 수신 코일의 상대적 위치에 따른 자기장 분포와 동력 전달 효율이 매우 중요하다. 본 연구는 ECG 센서를 사용한 HFSS 시뮬레이션 결과를 실제 측정 결과와 비교하였다. 시뮬레이션 결과 송신 코일과 수신 코일 간의 정렬이 어느 정도 변경 되더라도 전송효율은 비교적 안정적으로 유지 될 수 있음이 나타났다. 수신 코일의 중심이 송신 코일의 중심과 완벽하게 일치하면 전송효율이 최대가 되며, 수신 코일의 중심이 송신 코일의 중심으로부터 ± 10mm 내의 이동은 전송효율의 감소가 크지 않음을 확인 하였으며, 무선 전력 전송 시스템의 성능이 크게 저하되지 않는 것으로 확인 되었다. 본 결과는 이식형 센서를 위한 무선 전력의 활용에서 무선 전송의 표준화 된 적용 방법을 제안한다. 이를 통해 이식형 임플란트의 개발에 있어 무선전력전송에 대한 기준을 제시하고, 관련 디바이스의 개발에 적용 할 수 있을 것으로 판단된다.

Keywords

References

  1. B. Lee, M. Kiani, M. Ghovanloo, "A Triple-Loop Inductive Power Transmission System for Biomedical Applications,"IEEE transactions on biomedical circuits and systems, 10(1), 138-48, 2016. https://doi.org/10.1109/TBCAS.2014.2376965
  2. H. G. Lim, J. H. Kim, D. H. Shin, S. T. Woo, K. W Seong, J. H. Lee, "Wireless charing pillow for a fully implantable hearing aid: Design of a circular array coil based on finite element analysis for reducing magnetic weak zones,"Bio-medical materials and engineering, 26 Suppl 1: S1741-7, 2015. https://doi.org/10.3233/BME-151474
  3. M. D. Ker, C. Y. Lin, W. L. Chen, "Stimulus driver for epilepsy seizure suppression with adaptive loading impedance,"Journal of neural engineering, 8(6), 066008, 2011. https://doi.org/10.1088/1741-2560/8/6/066008
  4. S. E. Jo, S. Joung, J. K. Suh, Y. J. Kim, "Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism,"Medical & biological engineering & computing. 50(9), 973-80, 2012. https://doi.org/10.1007/s11517-012-0939-z
  5. K. M. Thotahewa, J. M. Redoute, M. R. Yuce, "Electromagnetic and thermal effects of IR-UWB wireless implant systems on the human head. Conference proceedings."Annual International Conference of the IEEE Engineering in Medicine and Biology Society IEEE Engineering in Medicine and Biology Society Annual Conference. 5179-82., 2013
  6. N. Carranza, V. Febles, J. A. Hernandez, J. L. Bardasano, J. L. Monteagudo, J. C. Fernandez de Aldecoa, "Patient safety and electromagnetic protection: a review,"Health physics, 100(5), 530-41, 2011. https://doi.org/10.1097/HP.0b013e3181f0cad5
  7. B. Swain, P. P. Nayak, D. P. Kar, S. Bhuyan, L. P. Mishra, "Wireless energizing system for an automated implantable sensor," The Review of scientific instruments, 87(7), 074708, 2016. https://doi.org/10.1063/1.4959269
  8. M. Kiani, I. M. Jow, M. Ghovanloo, "Design and Optimization of a 3-Coil Inductive Link for Efficient Wireless Power Transmission,"IEEE transactions on biomedical circuits and systems, 99, 1, 2011.
  9. K. R. Foster, R. Glaser, "Thermal mechanisms of interaction of radiofrequency energy with biological systems with relevance to exposure guidelines," Health physics, 92(6), 609-20, 2007. https://doi.org/10.1097/01.HP.0000262572.64418.38
  10. H. P. Schwan, G. M. Piersol, "The Absorption Of Electromagnetic Energy In Body Tissues. A Review And Critical Analysis," American Journal of Physical Medicine & Rehabilitation, 33(6), 371-404, 1954.