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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.
차량 내 신뢰성 있는 센서 (Sensor) 통신을 위한 온도보상 기반 이더넷 이퀄라이저 (Ethernet equalizer) 설계
서석태(Seoktae Seo),변영재(Franklin Bien) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.7
본 논문에서는 넓은 작동 온도 범위를 위해 온도보상기능을 가지는 이더넷 이퀄라이저를 소개한다. 차량 내부에 서로 통신하는 센서가 많아지면서, 차량용 통신에 대한 중요성이 높아진다. 많은 통신 방법 중에 이더넷 프로토콜은 넓은 통신 대역폭과 호환성을 가지기 때문에 차량용 통신을 위해 가장 선호되는 기술이다. 그러나 차량용 규격인 AEC-Q100을 만족시키기 위해서 제안하는 이더넷 통신 시스템은 -40℃에서 150℃에 해당하는 온도 범위에서 작동해야한다. 본 논문에서는 100m길이의 CAT-5 케이블에서 데이터를 보상하는 이더넷 이퀄라이저를 설계한다. 또한, 넓은 온도 범위에서 작동하기 위해 피드백 시스템을 이용한다. 제안하는 이퀄라이저는 완전 차동형 구조로 31.25MHz의 대역폭을 가지고 Hynix 0.13μm BCDMOS 기술로 구현한다. In this paper, an Ethernet equalizer that compensates for automotive temperature variations within a broad range is presented. Communications in automotive systems have become increasingly important because of the many electronics in vehicles. Ethernet protocols are a good candidate for automotive communications. However, they should satisfy the AEC-Q100 requirements that stipulate an operational temperature range from −40 to 150 °C. This paper proposes an Ethernet equalizer that can recover data up until 100 m length of CAT-5 cable adaptively within a temperature range of −40 to 150 °C. To support the wide temperature range, a feedback system is used. The proposed equalizer has a bandwidth of 31.25 MHz with a fully-differential structure and is implemented in a Hynix 0.13 μm BCDMOS technology.
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.
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.
Short Range Rear Obstacle Detector for Automobile by using 24㎓ AM Radar Sensor
김영수(Young Su Kim),최윤호(Yun Ho Choi),한수덕(Soo Deog Han),변영재(Franklin Bien) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
FMCW Radar sensor is commonly used for an automobile collision avoidance system for rider’s safe. Systems using FMCW radar, however, would be one of expensive solutions for just simple rear obstacle detection purpose due to its high cost. In this letter, a short range rear obstacle detector using novel 24㎓ AM radar sensor is presented. It can be implemented at significantly lower cost than FMCW radar for practical commercialization. The proposed AM radar sensor module is fabricated in a single aluminum housing to reduce the overall size while using single power supply voltage of 12V with 1200㎃ current for automotive applications. The measured detection range is up to 210㎝ with 10㎝ of distance resolution, which is suitable for a parking assistance system for automobiles.
컴퓨터의 보안향상을 위한 상호정전용량 터치스크린패널의 차동펄스를 이용한 지문인식을 위한 송신법
김성문(Seong Mun Kim),최은호(Eun Ho Choi),고낙영(Nak Young Ko),변영재(Franklin Bien) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.7
본 논문은 컴퓨터의 보안향상을 위한 차동펄스를 이용하여 상호정전용양 터치스크린 패널의 지문인식 송신법을 제안한다. 차동펄스생성기와 Ring-Counter로 구성되어 있으며, 공급전압은 5V이다. 제안된 시스템의 출력파형은 In-Phase 와 Out of Phase의 구성되었으며, 2ms의 동안에 1MHz가 포함된 펄스를 출력한다. 4개의 채널을 구동할 수 있는 구조로 설계되었으며 전체 전력소모량은 약 78.08nW 이다. 본 시스템은 TSMC 0.25um CMOS 공정으로 설계 되었고, Chip Area는 870um × 880um이다. This paper is proposed on the transmit Method Finger-Printer Scanning of Mutual Capacitance Touch Screen Panel Using Differential Pulse for improving the security of computer information. This system is composed of differential pulse generator and Ring-Counter, also Supply voltage is 5V. this system generates the Pulse wave which is composed of In-Phase and Out of Phase at 1MHz while period of 2m/s. it is designed and be able to operate four channels. Overall power consumption is approximately 78.08nW. This prototype is implemented in 0.25um CMOS Process and Chip area is 870um × 880um.
A Stent based In-vivo Bio-Sensing Microsystem through MICS and Wireless Power Transfer Platform
Hee-don Jang(장희돈),Kyung-min Na(나경민),Franklin Bien(변영재) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, a stent-based in-vivo bio-sensing microsystem including a medical implant communication service (MICS) and a wireless power transfer (WPT) platform is proposed. Conventional bio-marker monitoring method, such as blood pressure detecting or glucose level monitoring, suffer from accuracy, limited number of sampling, and pain. Proposed method involves one time procedural insertion of the microsystem, offering accurate and constant monitoring without pain. In this paper, 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. In order to supply power to MICS and in-vivo sensors, a WPT receiver chip including rectifier and regulator is implemented. The WPT receiver can provide 2.4 V output.
Displacement Sensor Circuit Using Eddy Current for Automobile Brake
김영수(Young Su Kim),최윤호(Yun Ho Choi),이정민(Jung Min Lee),노종상(Jong Sang Noh),변영재(Franklin Bien) 한국자동차공학회 2010 한국자동차공학회 지부 학술대회 논문집 Vol.2010 No.12
A displacement sensing circuit for automobile brake switch is presented. The circuit generates control signal for electronic control unit of automobile during brake being pressed. By using the eddy current on the metal plate induced by oscillation circuit of the sensor, high speed non-contact switching is implemented. The proposed circuit is well suited for the replacement of conventional metallic switch for the safety of the vehicle.