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정대택(Dae-Taek Chung),채수용(Soo-Yong Chae),홍순찬(Soon-Chan Hong) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.11
This paper proposes a new secondary battery charger/discharger available for zero voltage discharge which is used for test equipments and formation process. The proposed system is a switching type converter, and thus the system is high efficiency and more compact as compared with linear type charger/discharger. Conventional switching type charger/discharger can not discharge secondary batteries to zero voltage because of voltage drops in the switching elements and long distributing line(typically 10m). However, the proposed system is able to discharge the battery to zero voltage in constant current mode regardless of the voltage drops. In this paper, we analyze the proposed charger/discharger and the validity of the system is verified by simulation and experiment.
김희선(Hee-Sun Kim),정대택(Dae-Taek Chung),원화영(Hwa-Young Won),이형주(Hyoung-Ju Lee),홍순찬(Soon-Chan Hong) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.2
Isolated boost converter is desirable in the dc/dc converter applications where isolation is required and a large step up is needed. In this paper, it is proposed and analyzed the isolated boost converter which can step up low input voltage to high output voltage using transformer. Instead of using a conventional scheme, the proposed converter has the reset winding for volt-sec balance of transformer. Finally, the validity of the proposed isolated boost converter is verified by simulation.
김동욱(Dong-Wook Kim),채수용(Soo-Yong Chae),정대택(Dae-Taek Chung),구도연(Do-Yeon Koo),홍순찬(Soon-Chan Hong) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
This paper proposes new topology of discharge system. Proposed system can discharge until battery reaches zero voltage. The validity of proposed discharge system is verified by simulations.
채수용(Soo-Yong Chae),서영민(Young-Min Seo),정대택(Dae-Taek Chung),윤덕용(Duck-Yong Yoon),홍순찬(Soon-Chan Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper proposes a DC-DC converter which is able to charge and discharge secondary batteries. The converter operates as a double-ended forward converter in charging process and as electrical isolated boost converter in discharging process. The converter is designed for continuous current operation. The switching frequency is selected as 100㎑ to reduce the size of both the inductor and the capacitor.
홍순찬(Soon-Chan Hong),채수용(Soo-Yong Chae),정대택(Dae-Taek Chung),김희선(Hee-Sun Kim) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.6
절연된 부스트 변환기는 전기적인 절연과 매우 높은 승압을 필요로 하는 응용분야에 적합한 변환기이다. 낮은 입력전압을 높은 출력전압으로 승압하기 위해 필요한 변압기는 volt-sec 평형 조건을 만족하여야한다. 기존의 절연된 부스트 변환기는 도통구간을 오버랩하여 제어하였으며 이 경우 제어회로가 복잡해지는 문제가 있다. 본 논문에서는 변압기의 volt-sec 평형을 위해 리셋권선을 설치하고 자기구동 스위치를 이용하여 제어회로를 간단하게 구성할 수 있는 절연된 부스트 변환기를 제안하고 해석한다. 마지막으로 출력 10[W]급의 절연된 부스트 변환기를 구성하여 시뮬레이션하고 실험을 수행하여 제안한 변환기의 이론적 해석의 타당성을 입증하였다. Isolated boost converter is desirable in the dc/dc converter applications where isolation is required and extremely high step up is needed. Transformer used to step up low input voltage into high output voltage must satisfy the volt-sec balance condition. Conventional isolated boost converter is controlled with conducting intervals overlapping. In this case, there is a problem that control circuit is complicated. In this paper, it is proposed and analyzed the isolated boost converter which set up a reset winding for the volt-sec balance of transformer and can construct the control circuit simple by using a self-driven switch. Finally, the validity of the theoretical analyses for the proposed converter is verified by both simulations and experiments on the 10[W] class isolated boost converter.
유지구동전압 반감형 AC PDP용 에너지 회수 구동회로의 구현
임승범(Seung-Bum Lim),고영민(Young-Min Ko),정대택(Dae-Taek Chung),홍순찬(Soon-Chan Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
We proposed a new sustaining driver for AC PDPs with reduced sustain voltage by half, which cope with the demerits of the conventional TERES circuit. In the proposed circuit, the number of active switching elements are smaller than the TERES circuit by two and the energy recovery circuit is added. In this paper, the proposed circuit is implemented with control circuits and its validity is verified by the experimentation.