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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/>
영구자석 동기전동기용 전압원 인버터의 전압왜곡 분석 및 On-line 보상
김학원(H.W.Kim),윤명중(M.J.Youn),조관열(K.Y.Cho),김정철(J.C.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In a PWM VSI, the voltage distortion exists between the reference and output voltage. This distortion is caused by the intended blanking time and the inherent characteristics of the switching devices which are function of the operating condition In This paper, the dead-time effects are analysed and a new on-line estimation method for a PMSM is proposed to compensate time varying dead-time effects.
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.
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
대용량 및 높은 입력전압에 적합한 새로운 Three Level DC/DC컨버터
한상규(S.K.Han),오원식(W.S.Oh),문건우(G.W.Moom),윤명중(M.J.Youn) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
A novel three-level DC/DC converter (TLC)for high power applications operating from high input voltage is proposed Its switch voltage stress can be ensured to be only one-half of the input voltage. Nevertheless, since all input voltage is applied to the transformer primary side, it has good turns ratio The driving method of each module is same as those of the conventional phase-shifted ZVS full bridge PWM converter (PSFB) and the zero-voltage-switching (ZVS) of the leading leg are achieved exactly m the same manner as that of the PSFB<br/> Moreover, its three-level operation can considerably reduce the current ripple through the output inductor and it has no problems of the DC-link voltage unbalance. Therefore, It features a low voltage stress, high efficiency, low EM!, high power density, and small sized filter To confirm the operation, validity, and features of the proposed circuit, experimental results from a 200W, 600V/DC-48V/DC proto-type are presented.
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.
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.
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.