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서기영(K.Y.Suh),김영문(Y.M.Kim),문상필(S.P.Mun),김주용(J.Y.Kim),이현우(H.W.Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
In conventional three-phase rectifiers, it was necessary to use a transformer to obtain low output voltage, In this paper, we propose a characteristic experimental of three-phase diode rectifiers circuit that achieves low voltage by using a very simple circuit configuration that does not have a transformer and does not need any complex control. We also describe the operation principle of the proposed circuit, and derive a theoretical formula for its current waveform. On the basis these theoretical values with experimentally obtained input, output current characteristics, current amplification factor, and output voltage characteristics, allowed us to confirm the soundness of our theoretical analyses.<br/> <br/>
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
이민기(M.K-Lee),고강훈(K.H-Koh),서기영(K.Y-Suh),권순걸(S.K-Kwon),임근희(G.H-Rim),이현우(H.W-Lee) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Magnetic flux saturation depend on phase of Initial input power to high voltage transformer used in Micro wave oven.<br/> To limit inrush current high voltage transformer the relay contact should be "on" when the lowest point of input voltage phase.<br/> The improved circuit is for compensate interrupt signal Micom mput so the relay contact can be "on" when the inrush current is lower.<br/> Test result adapted said improved circuit for input voltage variation mode comply the limit 50A of requirement.
태양광 발전시스템의 부분그늘 보상을 위한 알고리즘에 관한 연구
고강훈(K.H.Koh),이현우(H.W.Lee),서기영(K.Y.Suh),고희석(H.S.Koh),문성찬(S.C.Moon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
In this paper, compare and analyze existent MPPT algorithms Existent algorithms have defects which don't generate it in a partial shade or low insolation. Therefore, to supplement it, we design improved IncCond algorithm consisted of a Aux. switch and capacitor with Generation Control circuit which can always obtain maximum generation power at the factor which is reduced generational efficiency by<br/> partial shade. Generation Control circuit is<br/> method which can always get maximum output power as it regularly controls each voltage of serial connected solar cell. Accordingly, it can improve efficiency and confidence of utility interaction inverter.<br/> Construction of system use a low price PIC16F87X. We analyze special character according to system operation through simulation and prove the validity through experiments.
소프트 스위칭 모드에 의한 고역률의 AC-DC 강압형 컨버터 토폴로지
문상필(S.P. Moon),서기영(K.Y. Suh),전중함(J.H. Chun),김영철(J.H Kim),김준홍(Y.C Kim),이현우(H.W. Lee) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
This paper propsed that a AC-DC Converter topology of high power factor with soft switching mode operates with four chopper conoecting a number of parallel ciruit. To improve these, a large number of soft switching topologies included a resonant circuit have been proposed. And. some simulative results on computer is included to confirm the validity of the analytical results. The partial resonant circuit makes use of a inductor using step up and a condenser of laos-less snubber. The result is that the switching loss is very low and the efficiency of system is high. And the snubber condenser used in partial resonant circuit makes charging engergy regenerated at input power source for resonant operation. The proposed conversion system is deemed the most suitable for high power applications where the power switching devices are used.