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A Direct Single-phase Quasi-resonant AC-AC Converter with Zero Voltage Switching
Mihail Hristov Antchev 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
The present article reports an analysis and investigation of a direct AC-AC quasi-resonant converter. A bidirectional power device, whose switching frequency is lower than the frequency of the current passing through the load, is used for its realization. The zero voltage switching mode is described when zero voltage on the power device is available by measuring it with the control system. The continuous current in the resonant inductance by switching the power device at zero voltage is considered, and it is characterized by two sub-modes. A mathematical analysis of the processes has been made and comparative results from the computer simulation and experimental study have been brought. The converter can be used in a wide areas of power electronics: induction heating, wireless power transfer, AC-DC converters, etc.
A Direct Single-phase Quasi-resonant AC-AC Converter with Zero Voltage Switching
Antchev, Mihail Hristov The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
The present article reports an analysis and investigation of a direct AC-AC quasi-resonant converter. A bidirectional power device, whose switching frequency is lower than the frequency of the current passing through the load, is used for its realization. The zero voltage switching mode is described when zero voltage on the power device is available by measuring it with the control system. The continuous current in the resonant inductance by switching the power device at zero voltage is considered, and it is characterized by two sub-modes. A mathematical analysis of the processes has been made and comparative results from the computer simulation and experimental study have been brought. The converter can be used in a wide areas of power electronics: induction heating, wireless power transfer, AC-DC converters, etc.
Baah, J.,Shelford, J.A.,Hristov, A.N.,McAllister, T.A.,Cheng, K.J. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.6
The effects of the nonionic surfactant Tween 80 and a mixture of fibrolytic enzymes on total tract digestion, in situ disappearance (ISD) and ruminal fermentation characteristics of orchardgrass hay and barley grain were investigated in a 4${\times}$4 Latin square experiment with 4 non-lactating Holstein cows and 4 diets in 4 periods. Cows were offered a total mixed ration of 50% rolled barley grain and 50% orchardgrass hay treated with either 1) water (control), 2) 0.2% (vol/wt) Tween 80, 3) 0.2% (vol/wt) hydrolytic enzyme, or 4) 0.2% hydrolytic enzyme plus 0.2% Tween 80. Total tract digestibility coefficients of DM, nitrogen, NDF and ADF were not affected (p>0.05) by dietary treatment. Compared to the control, the rate of ISD of DM from orchardgrass hay was faster (p<0.05) in cows receiving diets treated with the enzyme alone or with enzyme plus Tween 80 (0.06/h vs. 0.076 and 0.069/h). The rate of digestion was lower (p<0.05) as compared to control when barley grain was treated with these additives. Ruminal fluid pH and concentrations of total VFA, acetate, isobutyrate and butyrate were not affected (p>0.05) by treatments. Cows that consumed diets treated with enzyme plus Tween 80 had higher (p<0.05) ruminal concentrations of propionate and isovalerate, and lower (p<0.05) acetate:propionate ratios. Compared to the control, microbial protein synthesis tended (p = 0.13) to increase with the addition of enzyme to the diet while nonammonia nitrogen flow to the duodenum increased (p<0.05) with both enzyme and Tween 80 treatments. The study indicated that fibrolytic enzymes alone or in combination with Tween 80 could enhance ISD of orchardgrass hay and ruminal concentrations of propionate, valerate and iso-valerate, but do not affect total tract digestibility.
OBSERVATIONS OF THE NEAR-INFRARED SPECTRUM OF THE ZODIACAL LIGHT WITH CIBER
Tsumura, K.,Battle, J.,Bock, J.,Cooray, A.,Hristov, V.,Keating, B.,Lee, D. H.,Levenson, L. R.,Mason, P.,Matsumoto, T.,Matsuura, S.,Nam, U. W.,Renbarger, T.,Sullivan, I.,Suzuki, K.,Wada, T.,Zemcov, M. IOP Publishing 2010 The Astrophysical journal Vol.719 No.1
THE <i>COSMIC INFRARED BACKGROUND EXPERIMENT</i> ( <i>CIBER</i> ): THE LOW RESOLUTION SPECTROMETER
Tsumura, K.,Arai, T.,Battle, J.,Bock, J.,Brown, S.,Cooray, A.,Hristov, V.,Keating, B.,Kim, M. G.,Lee, D. H.,Levenson, L. R.,Lykke, K.,Mason, P.,Matsumoto, T.,Matsuura, S.,Murata, K.,Nam, U. W.,Renbarg IOP Publishing 2013 The Astrophysical journal Supplement series Vol.207 No.2
Analysis of Dark Data of the PICNIC IR Arrays in the CIBER
이대희,김민규,M. Zemcov,남욱원,J. Bock,J. Battle,V. Hristov,T. Renbarger,T. Matsumoto,I. Sullivan,L. R. Levenson,P. Mason,김건희,K. Tsumura,S. Matsuura 한국우주과학회 2010 Journal of Astronomy and Space Sciences Vol.27 No.4
We have measured and analyzed the dark data of two PICNIC IR arrays (P574 and P560) obtained through the Cosmic Infrared Background ExpeRiment (CIBER). First, we identified three types of bad pixels: the cold, the hot, and the transient, which are figured in total as 0.06% for P574 and 0.19% for P560. Then, after the bad pixels were masked, we determined the dark noise to be 20.5 ± 0.05 e- and 16.1 ± 0.05 e-, and the dark current to be 0.6 ± 0.05 e-/sec and 0.7 ± 0.05 e-/sec for P574 and P560, respectively. Finally, we discussed glitches and readout modes for a future mission.
THE <i>COSMIC INFRARED BACKGROUND EXPERIMENT</i> ( <i>CIBER</i> ): THE WIDE-FIELD IMAGERS
Bock, J.,Sullivan, I.,Arai, T.,Battle, J.,Cooray, A.,Hristov, V.,Keating, B.,Kim, M. G.,Lam, A. C.,Lee, D. H.,Levenson, L. R.,Mason, P.,Matsumoto, T.,Matsuura, S.,Mitchell-Wynne, K.,Nam, U. W.,Renbarg IOP Publishing 2013 The Astrophysical journal, Supplement series Vol.207 No.2
Observation of the Cosmic Near-Infrared Background with the CIBER rocket
MinGyu Kim,T. Matsumoto,Hyung Mok Lee,T. Arai,J. Battle,J. Bock,S. Brown,A. Cooray,V. Hristov,B. Keating,P. Korngut,Dae-Hee Lee,L. R. Levenson,K. Lykke,P. Mason,S. Matsuura,U. W. Nam,T. Renbarger,A. S 한국천문학회 2012 天文學會報 Vol.37 No.1
THE <i>COSMIC INFRARED BACKGROUND EXPERIMENT</i> ( <i>CIBER</i> ): THE NARROW-BAND SPECTROMETER
Korngut, P. M.,Renbarger, T.,Arai, T.,Battle, J.,Bock, J.,Brown, S. W.,Cooray, A.,Hristov, V.,Keating, B.,Kim, M. G.,Lanz, A.,Lee, D. H.,Levenson, L. R.,Lykke, K. R.,Mason, P.,Matsumoto, T.,Matsuura, IOP Publishing 2013 The Astrophysical journal, Supplement series Vol.207 No.2