Progress in Medical Physics (한국의학물리학회지:의학물리)
- Volume 19 Issue 1
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- Pages.42-48
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- 2008
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- 2508-4445(pISSN)
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- 2508-4453(eISSN)
Wireless Energy and Data Transmission Using Inductive Coupling
유도결합방식에 의한 무선 에너지 및 데이터 전송
- Lee, Joon-Ha (Dept. of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, Dept. of Biomedical Engineering, Yeungnam University Medical Center)
- 이준하 (영남대학교 의과대학 생화학분자생물학교실, 영남대학교 의료원 생의공학과)
- Published : 2008.03.31
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 1MHz, the transmitter coil has a diameter of 46mm, and the implant coil is 46mm. 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 30mm) 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.
최근 첨단 과학의 발달과 함께 인체조직에 대한 적용도가 뛰어난 소재가 개발되어 초소형의 이식형 장치가 개선되어감에 따라 전력공급방법의 다양한 연구가 이루어져 유도코일을 이용하여 무선으로 전력을 전송하는 장치가 연구되어오고 있다. 이에 저자는 이론적으로 효율이 100%인 E급 전력증폭기를 사용하여