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곽동걸(D. K. Kwak),정도영(D. Y. Jung),김춘삼(C. S. Kim),심재선(J. S. Shim),신호준(H. J. Shin),김진환(J. H. Kim) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
As the inactive response characteristics of the existing RCD (Residual Current protective Device) used on low voltage power distribution lines, so control of overload and electric short circuit faults, major causes of electrical fires, are not enough. Therefore this paper is proposed a auxiliary trip apparatus of RCD by using a high precision magnetic flux sensor (namely, reed switch) for the prevention of electrical disasters caused by overload or electric short circuit faults. The sensitive reed switch in the proposed auxiliary trip apparatus exactly detects the increased magnetic flux with the overload or the short current caused by a number of electrical faults, and then rapidly cuts off the existing RCD. The proposed auxiliary trip apparatus of RCD is confirmed the excellent characteristics in response velocity and accuracy in comparison with the conventional circuit breaker through various operation performance analysis.
곽동걸(D. K. Kwak),이봉섭(B. S. Lee),김춘삼(C. S. Kim),심재선(J. S. Shim),유주희(J. H. Yu),손재현(J. H. Son) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
This paper is study on a high efficiency DC-DC converter of discontinuous conduction mode (DCM) added electric isolation. The converters of high efficiency are generally made that the power losses of the used semiconductor switching devices is minimized. To achieve high efficiency system, the proposed converter is constructed by using a quasi resonant circuit. The control switches using in the converter are operated with soft switching by quasi resonant method. The control switches are operated without increasing their voltage and current stresses by the soft switching technology. The result is that the switching loss is very low and the efficiency of the system is high. The proposed converter is also added electric isolation which is used a pulse transformer. When the power conversion system is required electric isolation, the proposed converter is adopted with the converter system development of high efficiency. The soft switching operation and the system efficiency of the proposed converter are verified by digital simulation and experimental results.
곽동걸(D. K. Kwak),이봉섭(B. S. Lee),김춘삼(C. S. Kim),심재선(J. S. Shim),박영직(Y. J. Park) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
In this paper, authors propose a new buck-boost converter of discontinuous conduction mode (DCM) added electric isolation. The proposed converter with DCM eliminates the complicated circuit control requirement and reduces the size of components. The general converters of high efficiency are made that the power loss of the used switching devices is minimized. To achieve the soft switching operation of the used control switches, the proposed converter uses a lossless snubber capacitor. The proposed converter achieves the soft-switching for all switching devices without increasing their voltage and current stresses. The result is that the switching loss is very low and the efficiency of converter is high. The soft switching operation of the proposed converter is verified by digital simulation and experimental results.