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

Yoon-Myoung Gimm, Young-Jun Ju, Yu-Ri Lee, Dong-Yeol Lee, Jong-Wook Wang
2011 Journal of the Korean Institute of Electromagnetic Engineering and Science  
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
more » ... 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.
doi:10.5515/jkiees.2011.11.4.298 fatcat:rww4cxzp6bafvpogxghohehyvi