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문상필(S.P. Mun),권순걸(S.K. Kwon),서기영(K.Y. Suh),김영문(Y.M. Kim),류재엽(J.Y. Ryu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Recently, a fuel cell with low voltage and high current output characteristics is remarkable for new generation system. It needs both a DC-DC step-up converter and DC-AC inverter to be used in fuel cell generation system. Therefor, this paper, consists of an isolated DC-DC converter to boost the fuel cell voltage 380[VDC] and a PWM inverter with LC filter to convent the DC voltage to single-phase 220[VAC]. Expressly, a tapped inductor filter with freewheeling diode is newly implemented in the output filter of the proposed high frequency isolated ZVZCS PWM DC-DC converter to suppress circulating current under the wide output voltage regulation range, thus to eliminate the switching and transformer tum-on/off over-short voltage or transient phenomena. Besides the efficiency of 93-97[%]is obtained over the wide output voltage regulation ranges and load variations.
3[㎾]급 주택용 연료전지시스템에 사용되는 새로운 DC-DC 컨버터
이수호(S.H. Lee),문상필(S.P. Mun),이현우(H. W. Lee),서기영(K.Y. Suh),권순걸(S.K. Kwon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper presents a novel DC-DC Converter for 3[㎾] Fuel Cell System Residential Application. Phase shifted control is employed to regulate the output voltage and achieve soft switching. The transformer leakage inductance is utilized effectively to achieve zero voltage tum on for the power semiconductor switches. The current doubler rectifier has only one diode drop. The transformer secondary winding current rating is one half the load current, The overall effciency of the converter is improved.
정상화(S.W. Jung),강욱중(W.J. Kang),권순걸(S.K. Kwon),서기영(K.Y. Suh),이현우(H.W. Lee) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a four times DC-link voltage PWM power converter, which is constructed by four cascade connected power switching devices such as IGBT These four switching devices are controlled by a sinusoidal PWM method to obtain a DC-link voltage which IS higher than 4 times the peak supply voltage, and to suppress input current harmonic components achieving a sinusoidal current waveform with less than 3[%] distortion. Which is also constructed by four cascade connected IGBT<br/> by the Simulation result
고강훈(K H Ko),곽동걸(D.K Kwak),서기영(K Y Suh),권순걸(S K Kwon),이현우(Hyun-woo Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In the buck-boost DC-DC converter which is used at a certain situation such as in factories where loads often change a lot, the switches in the device make big energy loss in operating at Buck-Boost Mode due to hard switching and are affected by lots of stresses which decrease the efficiency rate of the converter In order to Improve this problem, to decrease the loss of snubber and switching, it has been investigated that zero voltage switching mode and zero current switching mode which make the operation of switches with soft switching, For the more sophisticated and advanced device, this paper is presented the Partial Resonant Soft Switching Mode Power Converter which is adapted the<br/> power converter having the partial resonant soft switching mode, that makes switches operate when the resonant current or voltage becomes zero by making the resonant circuit partially at turning on and off of the switches with suitable layout of the resonant elements and switch elements m the converter. Also, this paper includes the analysis and simulation of the Partial Resonant type Buck-Boost Chopper
연료전지 전원 시스템의 설계 및 분석을 위한 PEMFC의 회로 모델
이수호(S. H. LEE),이현우(H. W. LEE),권순걸(S. K. Kwon) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
The Proton Exchange Membrane Fuel Cells (PEMFCs) are being used in a variety of applications including portable power generation, transportation and back-up power systems. In this paper presents a novel circuit model for a PEMFC that can be used to design and analyze fuel-cell power system. The Pspice-based model uses BJTs, L and C elements available in the Pspice library with some modification. The model includes the phenomen like activation polarization, ohmic polarization, and mass transport effect present in a PEM fuel cell. Simulated characteristics of the fuel cell were compared with the experimental results obtained on a commercial fuel cell.