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Original Article

Korean Journal of Medical Physics 2008; 19(1): 42-48

Published online March 25, 2008

Copyright © Korean Society of Medical Physics.

Wireless Energy and Data Transmission Using Inductive Coupling

유도결합방식에 의한 무선 에너지 및 데이터 전송

Joon Ha Lee

이준하

Dept. of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, Daegu, Korea Dept. of Biomedical Engineering, Yeungnam University Medical Center, Daegu, Korea

영남대학교 의과대학 생화학·분자생물학교실, 영남대학교 의료원 생의공학과

Abstract

Bio-implantable devices such as heart pacers, gastric pacers and drug-delivery systems require power for carrying out their intended functions. These devices are usually powered through a battery implanted with the system or are wired to an external power source. This paper describes an inductive power transmission link, which was developed for an implantable stimulator for direct stimulation of denervated muscles. The carrier frequency is around 1 MHz, the transmitter coil has a diameter of 46 mm, and the implant coil is 46 mm. Data transmission to the implant with amplitude shift keying (ASK) and back to the transmitter with passive telemetry can be added without major design changes. We chose the range of coil spacing (2 to 30 mm) to care for lateral misalignment, as it occurs in practical use. If the transmitter coil has a well defined and reliable position in respect to the implant, a smaller working range might be sufficient. Under these conditions the link can be operated in fixed frequency mode, and reaches even higher efficiencies of up to 37%. The link transmits a current of 50 mA over a distance range of 2-15 mm with an efficiency of more than 20% in tracking frequency. The efficiency of the link was optimized with different approaches. A class E transmitter was used to minimize losses of the power stage. The geometry and material of the transmitter coil was optimized for maximum coupling. Phase lock techniques were used to achieve frequency tracking, keeping the transmitter optimally tuned at different coupling conditions caused by coil distance variations.

KeywordsInductive coupling, Power transmission

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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