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서민성(M.S.Seo),류동균(D.K.Ryu),김이훈(L.H.Kim),김준호(J.H.Kim),원충연(C.Y.Won),배기훈(K.H.Bae) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper digitally based excitation systems for the synchronous brushless generators are presented. System configuration, control functions with their structure functions are also shown<br/> The control system has two feedback loops main one based on a generator's voltage with digital controller and inner one based on excitation voltage of the exciter with analog controller<br/> Usually the generator regulation of voltage is made with transducers for the voltage measurement. This paper shows technique of measuring the voltage without harmonics affect, using Park's equation transformation.
박재석(J. Park),장덕일(D. Jang),서민성(M. Seo),김성동(S. Kim) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
This study is designed to solve the problem of general paralysis patients suffering from muscle diseases such as Lou Gehrig’s disease. A general paralysis patient is unable to move and cannot speak due to muscular dystrophy and muscle weakness. But they can move their eyes, they use them to conduct a search. In this study, a eye-mouse instrument was studied in which a general paralysis patient communicates using eye movement, and an eye-mouse was controlled using Arduino. The configuration recognizes the movement of the eyeball using glasses, QTR sensor, and mpu-6050 acceleration sensor, making it mouse-click and output to the monitor. Experiments have shown that it took an average of 19 seconds to access three web pages, and that it is easy for beginners as well as experienced people to use. The actual implementation of eye-mouse was demonstrated by this design.
ZCS 보조회로를 이용한 ZVT Boost 컨버터에 관한 연구
류동균(D.K. Ryu),이우석(W.S. Lee),최태영(T.Y. Choi),서민성(M.S. Seo),원충연(C.Y. Won),김영렬(Y.R. Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
Recently, a ZVT boost converter is embedded in a power factor correction system. The control circuit of the converter assures soft-switching for all the MOSFETs and load regulation The PFC system contains additional control circuits which assure the input voltage in a sinusoidal form and feed-forward line voltage regulation. In this paper, a soft switching boost converter with zero-voltage transition(ZVT) main switch using zero-current switching(ZCS) auxiliary switch is proposed. Operating intervals of the converter are persented and analyzed. The proposed results show that the main switch maintains ZVT while auxiliary switch retains ZVT whiles auxiliary switch retains ZCS for the complete specified line and load conditions.<br/> <br/>