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Gwan-Bon Koo,Tae-Sung Kim,Gun-Woo Moon,Myung-Joong Youn 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2002 International Journal of Assistive Robotics and Me Vol.3 No.4
It is proposed that a capacitor be inserted in the main power flow of the primary side of a phase shift full bridge converter with series-connected two transformers (PSFBC with SCTT) for high efficiency in this paper. This method overcomes the disadvantage of conventional PSFB converter share with PSFBC with SCTT, conduction loss by a circulating current during the freewheeling mode. The primary voltage across the transformers increases due to the voltage across the inserted capacitor, allowing the turn ratio of the transformers to be increased. Furthermore, because of the capacitor, the primary current can be diminished nearly to zero during the freewheeling period so that the circulation energy during that period is reduced. As a result, the efficiency of the proposed converter is higher than that of the PSFBC with SCTT. A mode analysis and experimental results are presented to validate the proposed converter.
Analysis and Design of a Phase Shift Full Bridge Converter With Series-Connected Two Transformers
Gwan-Bon Koo,Tae-Sung Kim,Gun-Woo Moon,Hyun-Soo Kim,Myung-Joong Youn 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2002 International Journal of Assistive Robotics and Me Vol.3 No.3
A new phase shift full bridge (PSFB) converter with series-connected two transformers is proposed. The main feature of the proposed converter is the zero voltage switching (ZVS) down to a very light load using the magnetizing currents of the transformers. Furthermore, no inductor is needed in the secondary side of the proposed converter since the two transformers can replace both a main transformer and an output inductor. Therefore, it is well suited for an on-board converter of a few hundreds watts, which requires a high efficiency and high power density. A mode analysis, design equations through the large signal modeling, and experimental results are presented to verify the validity of the proposed converter.
구본관(Koo Bon-gwan) 한국어문학회 2009 語文學 Vol.0 No.103
The purpose of this study is to investigate relation of the paradigm shift and the direction of grammar teaching in Korean education. The basic assumption of this study is that the direction of grammar teaching changes in accordance with the paradigm shift of linguistics, pedagogy etc. Chapter 2 deals with relation of the paradigm shift of linguistics, pedagogy and the changes of grammar teaching. Chapter 3 deals with various aspects of the changes of grammar teaching. Chapter 4 deals with new direction of grammar teaching based on the honorific expressions of Korean. To explain these issues, we give careful consideration to institution of curriculum, textbooks and so on. As a consequence, we comprehend the direction of grammar teaching in Korean education.
직렬 연결된 두개의 트랜스포머를 갖는 새로운 위상천이 풀 브릿지 컨버터
구관본(Gwan-Bon Koo),김태성(Tae-Sung Kim),문건우(Gun-Woo Moon),윤명중(Myung-Joong Youn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A new phase shift full bridge converter(PSFB) with serially connected two transformers is proposed. it is well suited for applications in the communication equipment of a few hundred watts. The main features of the proposed converter are a wide input voltage range, an easiness to meet the requirement for zero voltage switching (ZVS) condition at a light load, and a small output voltage ripple Furthermore, it features high power density since serially connected two transformers can replace both a main transformer and an output inductor. A mode analysis and experimental results are presented to verify the validity of the proposed converter.
초기 기동과 출력단 단락시 드레인 전류의 과도한 상승 방지 방법
구관본(Gwan-Bon Koo),김진태(Jin-Tae Kim),이재훈(J-Hoon Lee) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
대부분의 컨버터들은 초기 기동시에 MOSFET 전류와 전압의 과도한 상승을 막아주기 위해서 Soft Start 기능을 갖고 있다. 하지만 제어기 내부의 지연시간이나 LEB(Leading Edge Blanking) 시간 등으로 인해 MOSFET은 무시할 수 없는 상당한 기간의 최소 턴온 시간(Minimum Tum-on Time)을 갖게 되고, 이로 인해 드레인 전류가 과도하게 상승하는 현상을 보이게 된다. 본 논문에서는 이런 현상이 발생할 수 있는 초기 기동이나 출력단 단락시에 과도한 드레인 전류의 상승을 막아주는 방법을 제시하고자 한다.