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유병우(B.W. Ryu),한정만(J.M. Han),이동욱(D.W. Lee),이종달(J.D. Lee),이병희(B.H. Lee),최성욱(S.W. Choi),문건우(G.W. Moon) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
최근 LCD 모니터, Note PC, 가정용 게임기, Mobile Phone, MP3 등의 소형 전자 제품의 사용이 증가함에 따라 이들 전자제품의 전원 공급에 필요한 다양한 AC/DC 어댑터가 요구된다. AC/DC 어댑터는 밀폐형의 구조를 가지므로, 열적인 문제 때문에 용량과 사이즈가 제한되어 왔다. 하지만 최근에는 소형전자제품의 용량이 점차 증가하고, 더불어 소비자의 휴대성 및 심미적 요구에 부응하기 위하여 소형 및 경량의 고밀도 AC/DC Adapter를 개발하여야 한다. 이를 위해서 높은 수준의 회로 설계 및 방열 기술이 필요하다. 본 논문에서는 Laptop PC에 적용되는 85W급 AC/DC Adapter용 고밀도전원을 개발하고 실험으로 검증하였다.
영전압 스위칭 풀 브릿지 토폴로지를 기반으로 한 새로운 단일 전력 단 역률개선 AC/DC 컨버터
김태성(T.S.Kim),구관본(G.B.Koo),문건우(G.W.Moon),윤명중(M.J.Youn) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
A new single stage power factor correction(PFC) AC/DC converter based on zero voltage switching(ZVS) fun bridge topology is proposed, Since the series-connected two transformers act as both output inductor and main transformer by turns, the proposed converter has a wide ZVS range without additional devices for ZVS, Furthermore, since there is no need to use an output inductor, the proposed converter features high power density, The proposed converter gives the good power factor correction and low line current harmonics distortion, A mode analysis and experiment results are presented to verify the validity of the proposed converter
Zero-Voltage Switching Two-Transformer Full-Bridge PWM Converter With Lossless Diode-Clamp Rectifier
윤현기(H.K. Yoon),한상규(S.K. Han),박진식(J.S. Park),문건우(G.W. Moon),윤명중(M.J. Youn) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The two-transformer full bridge (TTFB) PWM converter has two transformers which act as the output inductor as well as the main transformer, i.e. as the forward and the flyback transformer. Although the doubled leakage inductor of the TTFB makes it easier to achieve the zerovoltage switching (ZVS) of the lagging leg switch along the wide load range, it instigates a serious voltage ringing in the secondary rectifier diodes, which would require the dissipative snubber circuit, cause the serious power dissipation, and increase the voltage stress across those diodes. To overcome these problems, a new lossless diode-clamp rectifier (LDCR) is employed as the output rectifier, which helps the voltage across rectifier diodes to be clamped on a half the output voltage (Vo/2) or the output voltage (Vo). Therefore, no dissipative snubber for rectifier diodes is needed and a high efficiency as well as low noise output voltage can be realized. The operations, analysis and design consideration of proposed converter are presented in this paper. To verify the validity of the proposed converter, experimental results from a 425W, 385-170Vdc prototype for the plasma display panel (PDP) sustaining power module (PSPM) are presented.
넓은 영전압 스위칭 범위를 갖는 대화면 PDP용 유지 전원단을 위한 고효율 전력 변환 회로
박경화(K.H. Park),이우진(W.J. Lee),윤명중(M.J. Youn),문건우(G.W. Moon) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Recently, due to the launching of digital broadcasting service, a demand of PDP TV with large screen size is sharply rising. PDP power module is mainly divided into power factor correction (PFC) stage and sustaining power stage. Especially, sustaining power module has pulsating load characteristics. So, the hard switching at light load condition causes low efficiency and thermal problem. Therefore, a new power conversion circuit for sustaining power module of 60" PDP is proposed whose ZVS is obtained by additional ZVS tank. This paper presents properties of the proposed converter through mode analysis, numerical analysis. And a 900W prototype for sustaining power module of 60" PDP is produced to verify the analytic results. As an experimental results, ZVS is achieved from full load to 10% load variation and more than 92% of high efficiency is obtained at 10% load condition.
PDP를 위한 새로운 전류원 타입의 에너지 회수 및 방전유지 회로
한상규(S.K. Han),문건우(G.W. Moon),운명중(M.J. Youn) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
A novel current-fed energy-recovery sustaining driver (CFERSO) for a POP is proposed m this paper Its main idea is to recover the energy stored in the POP or to inject the input source energy to the POP by using the current source built-up in the energy recovery inductor. This method provides zero-voltage-switching (ZVS) of all main power switches, the reduction of EMI, and more improved operational voltage margins with the aid of the discharge current compensation In addition, since the current flowing through the energy recovery inductor can compensate the plasma discharge current flowing through the conducting power switches, the current stress through all main power switches can be considerably reduced. Furthermore, It features a low conduction loss and fast transient time. Operations, features and design considerations are presented and verified experimentally on a I020XI06mm sized POP, 50kHz-switching frequency, and sustaining voltage 140V based prototype.<br/>
전력 계통내에서 순간 전압 강하에 빠른 응답 특성을 가진 DVR의 제어
김명복(M.B. Kim),이승훈(S.H. Lee),문건우(G.W. Moon),윤명중(M.J. Youn) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
A new control strategy for dynamic voltage restorer (DVR) is proposed It is based on synchronous PI control strategy which features fast response Therefore, the proposed control strategy takes faster action against a voltage sag. Experimental results, executed by DSP, are shown to validate the proposed control strategy<br/>
새로운 마그네틱 피드백 기법을 이용하여 낮은 링크 전압을 갖는 새로운 단일 전력단 역률 개선 AC/DC 컨버터
최은석(E.S. Choi),윤현기(H.K. Yoon),김정은(C.E. Kim),문건우(G.W. Moon),윤명중(M.J. Youn) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Novel single-stage power factor correction AC/DC converter with low DC link voltage using new magnetic feedback technique is proposed in this paper. The Proposed converter has high power factor, tight output voltage regulation and low link capacitor voltage less than 450V for all the load range through the universal input line. This converter has also no dead-zone in the input current, which is seen in the conventional converter using the previous magnetic feedback technique. In this paper, the analysis of operations and features of the proposed converter is provided, and the experimental results of 90W-prototype shows the low harmonic distortions satisfied with EN 61000-3-2 Class D, high power factor and low link voltage less than 450V.
LCD 모니터의 어댑터를 위한 고역률 고효율 PFC AC/DC 컨버터
박경화(K.H.Park),김정은(C.F.Kim),윤명중(M.J.Youn),문건우(G.W.Moon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
Many single-stage PFC(power-factor-correction) AC/DC converters suffer from the high link voltage at high input voltage and light load condition. In this paper, to suppress the link voltage, a novel high power factor high efficiency PFC AC/DC converter is proposed using the single controller which generates two gate signals so that one of them IS used for gate signal of the flyback DC/DC converter switch and the other is applied to the Boost PFC stage. A 130W prototype for LCD monitor adapter with universal input (90-265V_rms) and 19.5V 67A output is Implemented to verify the operational principles and performances. The experimental results show that the maximum link voltage stress IS about 450 V at 270Vac input voltage. Moreover, efficiency and power factor are over 84% and 0.95, respectively, under the full load condition.