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SRM 인버터의 병렬 스위칭을 위한 새로운 스위칭 패턴
이상훈(S. H. Lee),이상훈(S. H. Lee),정성우(S. W. Jung),임헌호(H. H. LIM),박성준(S. J. Park),안진우(J. W. Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A SRM inverter has very low switching frequency, This results m reducing the burden for a high-speed of the gate-amp interface circuit. and the linearity of optocoupler is used to protect the intanteneous peak current for the stable operation<br/> In this paper, series resistor is used to equal the current sharing of each switching device and a linear gate-amp is proposed to protect the intanteneous peak current which occurs in transient state.
이상훈(S. H. Lee),임헌호(H. H. LIM),박성준(S. J. Park),안진우(J W.Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In a motor driving, the current rate is directly related to the rate of a switching device and in cost reduction, the parallel switching operation is the alternatives because It has the smaller current rate through current division There are many investigations for the parallel switching operations to equaling the current division However It remains many problems for practical usage The reason is that the switching characteristics are mainly relied on the different saturation voltage of each device etc. and these factors are not altered by a Circuit designer. In order to compensate this problem, a proper resistance is experimently inserted to the switching device. But this method can not be the optimal solution Therefore this paper proposes a new parallel operation which uses a parallel phase winding to remove the traditional effect of switching device such as saturation voltage according to the division of current Also the reliable and stable driving is improved through experiments and the detailed principles
확신도 기법을 적용한 선박엔진 고장진단 전문가시스템 구현에 관한 연구
정경열(K.Y.Chung),최욱현(W.H.Choi),임헌호(H.H.Lim),류길수(K.S.Rhyu) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
This paper presents the design and implementation of a diagnosis system incorporating with a monitoring system. We classified the ship engine into the sub parts as similarly a experts classification method, acquired the causal relation between measuring data and fault states in consultation with experts, constructed a rule-base using them, and adopted a certainty-factor method in order to handle uncertanties of evidences and rules. When alarms occur, the system infers diagnostic conclusion by using certainty factor obtained from an alarm state (one of 4 levels) and an alarm datum's trend (one of 3 levels), and the certainty factor of a related rule (one of 3 levels).