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High Efficiency Active Clamp Forward Converter with Synchronous Switch Controlled ZVS Operation
이성세(Sung-Sae Lee),최성욱(Seong-Wook Choi),문건우(Gun-Woo Moon) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
A new synchronous switch controlled transient current build-up zero voltage switching (TCB-ZVS) forward converter is proposed. The proposed converter is suitable for the low-voltage and high-current applications. The features of the proposed converter are low conduction loss of magnetizing current, no additional circuit for the ZVS operation, high efficiency, high power density and low EMI noise throughout all load conditions.
New Zero-Voltage-Switching Method for High Efficiency Half-Bridge Converter
이성세(Sung-Sae Lee),문건우(Gun-Woo Moon) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a new full ZVS-range asymmetrical half bridge converter. It uses the variable transient current build-up technique with the load variations. The current build-up is accomplished by using the secondary synchronous switch control. Due to the blocking capacitor in secondary side, the voltage applied to leakage inductor varies with the load variations during current build-up period. Therefore, the unnecessary current build-up of leakage inductor current in heavy load condition is prevented and more current build-up in medium and light load condition is achieved for ZVS operation. That is, the variant current build-up with the load variation is accomplished for the ZVS operation. Furthermore, the DC offset of the transformer magnetizing current is also eliminated and the utilization of magnetic core is maximized.
역률 개선과 출력 전압 조정을 위한 불연속 모드의 승압형 컨버터가 결합된 단일 전력단 포워드-플라이볙 컨버터
이성세(Sung-Sae Lee),강정일(Jung-Il Kang),구관본(Gwan-Bon Gu),문건우(Gun-Woo Moon) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
In this paper, a DCM operated boost integrated single-stage forward-flyback converter is proposed. This proposed converter has high power factor, low harmonic distortion, and tight output regulation. To increase efficiency, zero voltage switching with asymmetrical control is used. This converter also give low voltage stress in switch and this results in low conduction loss with low turn-on resistance.<br/>
역률개선을 위해 경계전류모드로 동작하는 브리지리스 부스트 컨버터
유병규(Byung-Gyu Yu),이성세(Sung-Se Lee),한상규(Sang-Kyu Han),문건우(Gun-Woo Moon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
Recently, many nations have released standard such as IEC 1000-3-2 and IEEE 519 which Impose a limit on the harmonic current drawn by equipment connected to AC line in order to prevent the distortion of an AC line.<br/> Among the wide variety of active methods for improving power factor and harmonic distortion, the boost converter is very effective because It has a continuous line current, small choke filter and high power factor. In high power application, however, the bridge diode loss 10 the boost converter has made the efficiency lower and the temperature of the board higher. A new approach without bridge d10de to make the same characteristics of the conventional boost converter has also been developed This paper present the comparisons between the continuous current mode(CCM) operated conventional boost converter and the boundary current mode(BCM) operated the bridgeless boost converter for high efficiency and high power factor
42V 차량용 에너지 관리장치를 위한 양방향 DC/DC 컨버터의 개발
김인주(In-Ju Kim),이성세(Sung-Sae Lee),문건우(Gun-Woo Moon) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The amount of electric energy used in a vehicle will be increased continuously. The increment of electric power demand causes interest on new higher power system such as 42V Power Net. Furthermore, the necessity for development of energy storage device is highlighted recently. Bidirectional DC/DC Converter is one of the important parts in 42V power system. Therefore, this paper proposes bidirectional Cascade Buck-Boost DC/DC Converter which can satisfies required specifications in 42V power system. The operation principle is described along with simple control method, and experimental results on a 500W prototype are provided.
PC 파워 서플라이용 비대칭 하프브리지 DC/DC 컨버터의 초기 구동시 돌입전류 제거 기법
김재국(Jae-Kuk Kim),이성세(Sung-Sae Lee),오원식(Won-Sik Oh),김정은(Jung-Eun Kim),문건우(Gun-Woo Moon),길창현(Chang-Hyun Gil),조자룡(Ja-Ryong Cho) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper presents a start-up in-rush current reduction technique of asymmetry half-bridge DC/DC converter for PC power supply. The proposed converter is composed center-tapped half-bridge converter with blocking capacitor. The proposed converter can reduce the severe in-rush current when the proposed converter is power up. The validity of this study is confirmed from the experimental results.
전기자동차 응용을 위한 DC-DC 컨버터의 설계 및 제어
강정일(Jeong-il Kang),노정욱(Chung-Wook Roh),이성세(Gun-Woo Moon),문건우(Sung-Sae Lee),윤명중(Myung-Joong Youn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In the fuel-cell electric vehicle system, the low-voltage output of unit fuel-cell demands a number of cells to be stacked in series to produce a DC link voltage which is high enough to drive the vehicle inverter system. However, this increases the complexity of the fuel-cell control system This paper presents a design of high-efficiency boost converter emplying the average current-mode control, which is able to convert a low voltage of a fuel-cell generator with a small number of unit cells to a stable and high DC link voltage for electric vehicle applications