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RISS 인기검색어
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- 저자 : 서기영(K. Y. Suh) (검색결과 80 건)
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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/>
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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
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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.
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