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A Stent based In-vivo Bio-Sensing Microsystem through MICS and Wireless Power Transfer Platform
Heedon Jang(장희돈),Franklin Bien(변영재) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11
In this paper, a stent-based in-vivo bio-sensing microsystem, with a medical implant communication service (MICS) and a wireless power transfer (WPT) platform, is proposed. Conventional bio-marker monitoring methods -- such as blood pressure detecting or glucose level monitoring -- suffer from low accuracy, limited number of sampling, and user pain. The proposed method involves once procedural insertion of the microsystem, offering accurate and constant monitoring without pain. In this paper, an in-vivo bio-sensing microsystem is introduced with focus on the MICS and WPT platform implementation. For minimal size, a delay locked loop (DLL) with output frequency of 400 MHz is designed with a 1.8-V supply voltage. MICS IC consumes less than 2 mW, and in order to supply power to MICS and in-vivo sensors, a WPT receiver chip – which include rectifier and regulator – is implemented. The WPT receiver can provide 2.4 V output, with load regulation range up to 100 mA. Both MICS and WPT IC are fabricated in a 180 nm CMOS technology.
이승규(Seung-gyu Lee),변영재(Franklin Bien) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
This paper presents an adaptive technique to enhance the efficiency of magnetic resonance based wireless power transfer system for future war scenario with micro robots and portable electronics is deployed in the field. In order to transfer energy to micro robots and mobile devices, asymmetric coupling resonators with axial misalignment is exploited. By changing a coupling coefficient between coils only in the transmitting side, the system performance increases significantly. An experiment setup has been developed, and the S21 parameter has been measured showing 1 dB improvement of system using the adaptive technique at a distance of 70 cm that is equivalent to 50% relative efficiency improvement.
이승규(Seunggyu Lee),Hoang Minh Huy,변영재(Franklin Bien),김영수(Youngsu Kim) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.10-2
본 연구에서는 전기자동차에 무선으로 전력을 전송하는 방법과 그에 대한 효율을 증가 시킬 수 있는 방식을 제안하였다. 자기공명형 무선전력전송 방식에서 등가적 회로분석 방식을 통하여 주파수 분할 현상을 증명하였는데 이는 두 개의 공진기가 일정 이하의 거리에서는 공진 주파수의 변화를 통하여 효율의 보상할 수 있는 가능성을 보였으며 두 공진기의 기구적 불일치 상황에서 임피던스 정합희로를 사 용함으로 전송효율의 개선을 보였다. 10.14MHz의 공진 주파수에서 50%의 기구적 불일치를 가질 때 측정 결과, 50%의 효율 보상을 얻을 수 있음을 확인하였다.
전기 자동차 고효율 BMS 구현을 위한 하이브리드 타입 Charge Equalizer
나경민(Kyungmin Na),여인준(Yeoin June),변영재(Franklin Bien) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-1
Nowadays, electric vehicle(EV) or hybrid electric vehicle(HEV) usually adopts a lithium-ion battery string, the charge imbalance of each battery makes many problems such as reduction of life cycle and explosion. Hence, the charge equalization circuit is required to guarantee life time and safety. In charge equalization circuit, the cost of a cell voltage sensing module is relatively high, but the equalization performance gets lower in case module is removed. For higher equalization performance without the cell voltage sensing module, an automatic chare equalizer based on switch-capacitor is proposed. One pre-charged capacitor with average voltage of batteries is implemented from a unidirectional DC-DC converter. The charge equalization can be automatically achieved by periodic connection between battery cell and capacitor charged average voltage without voltage sensing module. By using pre-charged capacitor in switch-capacitor converter, the faster equalization time can be obtained. This paper presents the operational principles and design consideration of the proposed equalizer.