Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
권호 표지
DOI QR코드

DOI QR Code

Frequency Tracking of Resonance Frequency Variation of L-C Circuits for Wireless Energy Transmission to Medical Devices in Human Organs

  • Gimm, Yoon-Myoung (Department of Electronics and Electrical Engineering, Dankook University) ;
  • Ju, Young-Jun (Department of Electronics and Electrical Engineering, Dankook University) ;
  • Lee, Yu-Ri (Department of Electronics and Electrical Engineering, Dankook University) ;
  • Lee, Dong-Yeol (Department of Electronics and Electrical Engineering, Dankook University) ;
  • Wang, Jong-Wook (EMF Safety Inc.)
  • Received : 2011.05.16
  • Published : 2011.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

A capsular endoscope (CE) for inspection of the large intestine requires a motor for backward navigation against the autonomous travel in the intestine. This study proposes an HF power system for generating a magnetic field and for delivering wireless power to the internal or implanted medical devices. The magnetic field is generated by a wound coil (L) around a wooden frame, and the current is driven to the coil through a resonating capacitor (C). The characteristics of the resonance frequency shifting of the L-C series circuit are analyzed. A stable magnetic field intensity in the field coil is maintained by a specially designed frequency tracking system that automatically follows the L-C resonance frequency. Testing confirmed that the oscillation system tracks well the parameter changes of the electric components caused by the operating conditions or environmental variations.

Keywords

References

  1. George Gershman and Marvin Ament, Practical Pediatric Gastrointestinal Endoscopy, Blackwell Publishing, Malden, MA, USA, 2007.
  2. Youn-Myoung Gimm, et al., "125 kHz magnetic field attenuation characteristics in some of the homogeneous human organs," Electronic Proceedings of the 2007 International Symposium on Antennas and Propagation (2007 ISAP), pp. 430-433, Niigata, Japan, Apr. 2007.
  3. Yoon-Myoung Gimm, et al., "Frequency dependence of magnetic field attenuation in some simulant homogeneous human tissues," Electronic Proceeding of the Bioelectromagnetics Society (BEMS) 30th Annual Meeting, San Diego, USA, Jul. 2008.
  4. Wenzhen Fu, Bo Zhang, "Study on frequency-tracking wireless power transfer system by resonant coupling," Proceeding of IEEE 6th International Power Electronics and Motion Control Conference, pp. 2658-2663, Wuhan, China, May 2009.
  5. Gurhan Alpher Kendir, et al., "An optimal design methodology for inductive power link with class-E amplifier," IEEE Trans on Circuits and Systems-I., vol. 52, no. 5, pp. 857-866, May 2005. https://doi.org/10.1109/TCSI.2005.846208
  6. Youn-Myoung Gimm, et al, "Receiving coil analysis of wireless power transmission with inductive coupling," Proceedings of the 2007 Korea-Japan Microwave Conference (2007 KJMW, Okinawa, Japan), Nov. 2007.