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KMID : 1137820100310050401
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의공학회지
2010 Volume.31 No. 5 p.401 ~ p.406
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Implementation of a Transcutaneous Power Transmission System for Implantable Medical Devices by Resonant Frequency Tracking Method
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Lim Hyung-Gyu
Lee Jang-Woo
Kim Dong-Wook
Lee Jung-Hyun
Seong Ki-Woong
Kim Myoung-Nam
Cho Jin-Ho
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Abstract
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Recently, many implantable medical devices have been developed and manufactured in many countries. In these devices, generally, energy is supplied by a transcutaneous method to avoid the skin penetration due to the power wires. As the most transcutaneous power transmission methods, the electromagnetic coupling between two coils and resonance at a specific frequency has been used widely. However, in case of a transcutaneous power transmitter with a fixed switching frequency to drive an electromagnetic coil, inefficient power transmission and thermal damage by the undesirable current variation may occur, because the electromagnetic coupling state between a primary coil and a secondary coil is very sensitive to skin thickness of each applied position and by person. In order to overcome these defects, a transcutaneous power transmitter of which operating frequency can be automatically tracked into the resonance frequency at each environment has been designed and implemented. Through the results of experiments for different coil surroundings, we have been demonstrated that the implemented transcutaneous power transmitter can track automatically into a varied resonance frequency according to arbitrary skin thickness change.
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KEYWORD
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Implantable medical device, transcutaneous power transmission, electromagnetic coupling, resonant frequency tracking
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