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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

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

Wireless Power Transmission;L-C Resonance;Frequency Tracking Oscillator;Magnetic Field Generator

Acknowledgement

Supported by : Intelligent Microsystem Center

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.
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