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이덕환(D. H. Lee),이주석(J. S. Lee),김일권(I. K. Kim),김경환(K. H. Kim),박동삼(D. S. Park),유종근(C. G. Yu) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
본 논문에서 설계한 온도센서는 0.18㎛ CMOS 공정으로 -55℃~125℃의 온도 범위에서 ±0.1℃의 정확도를 갖는다. 이 센서는 parasitic PNP 트랜지스터로 온도 변화에 따른 전압을 추출하고 시그마-델타 변조기를 이용하여 디지털 온도 값을 얻기 위한 비트스트림을 생성한다. 또한, 이상적이지 않은 요소로 인해 발생할 수 있는 에러를 0.01℃ 레벨로 감소시키기 위해 DEM(Dynamic Element Matching)과 2차 시그마-델타 변조기를 이용하였고, Bandgap Reference 회로로 온도 변화에 상관없이 일정한 bias 전압을 생성한다. 설계된 온도센서의 면적은 PAD를 포함하여 0.98㎜×0.92㎜이고, 1.8V 단일 전원에서 동작한다.
길경석(G. S. Kil),송재용(J. Y. Song),김일권(I. K. Kim),문승보(S. B. Moon),차명수(M. S. Cha) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Conventional surge counters set up in grounding wire of lightning arresters measure only surge frequency, and do not provide enough data on surge current. However, we need many parameters like the amplitude, the polarity and the occurred time as well as frequency of surge currents to estimate the arrester condition. In this paper, we designed and fabricated a surge counter based on a microprocessor technology, which can measure the majority of parameters mentioned above. An exclusive sample and peak-hold IC was adopted to detect the amplitude of surge current having a short duration. The occurred time of surge current is offered from the real-time-clock(RTC) chip, and all the acquired data are saved on a 256kB E²PROM. Also, these data are transmitted to a personal computer by a serial communication protocol.
뇌충격 전류에 의한 접지극의 과도임피던스 특성에 관한 연구
김일권,송재용,길경석 한국해양대학교 산업기술연구소 2001 연구논문집 Vol.18 No.-
This paper describes the correlation of the transient impedance and its parameters with the stationary resistance of grounding systems to a lightning impulse current. The test were performed on single grounding rod(φ10[mm], 1[m]) and triple-grounding rods(φ10[mm], 1[m]) of equilateral triangles with 5[m] spacing. For measurements of transient impedance, impulse current tests using the standard 8/20[㎲] wave specified in IEC 61000-4-5 were carried out on the grounding system to simulate the transient characteristics in an actual field condition such as a grounding system for power distribution lines. In the experiment, transient impedance of the grounding systems have been investigated from the recorded potential and current waveforms. The results showed that the value of the transient impedance is quite higher than the stationary resistance, and provide useful information for the design of a grounding system considered transient characteristics under a high frequency condition such as lightning strokes and ground-fault.