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Y.Deguchi,S. Moisseev,M.Nakaoka,I.Hirota,H.Yamashita,H.Omori,H.Terai 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a simple and cost effective circuit topology of single-ended type high frequency quasi-resonant PWM inverter using IGBTs, which can operate under wide soft switching operation range based on ZCS for main power switch as compared with a conventional active voltage-clamped ZVS-PWM high frequency quasi-resonant inverter developed previously In principle, this new circuit topology can efficiently operate under a constant frequency PWM control-based power regulation scheme In particular, it is noted that the zero current soft switching (ZCS) commutation can achieve for the main active power switch On the other hand, the zero voltage soft switching (ZVS) commutation can also achieve for the auxiliary active power switch The operating principle of this high-frequency Inverter treated here and its power regulation characteristics are illustrated on the basis of the simulation and feasible experimental results.
T.Matsushige,M.Ishitobi,M.Nakaoka,D.Bessyo,H.Yamashita,H.Omori,H.Terai 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
The grid voltage of commercial utility power source in Japan and USA is l00rms, but in China and European countries, it is 200rms. In recent years, in Japan 2G0Vrms out putted single phase three wire system begins to be used for high power applications. In l00Vrms utility AC power applications and systems, an active voltage clamped quasi-resonant inverter circuit topology using IGBTs has been effectively used so far for the consumer microwave oven. In this paper, presented is a half bridge type voltage-clamped high-frequency inverter type AC-DC converter using which is designed for consumer magnetron drive used as the consumer microwave oven in 200V utility AC power system. This zero voltage soft switching inverter can use the same power rated switching semiconductor devices and three-winding high frequency transformer as those of the active voltage clamped quasi-resonant inverter using the IGBTs that has already been used for 100V utility AC power source. The operating performances of the voltage source single ended push pull type inverter are evaluated and discussed for consumer microwave oven. The harmonic line current components in the utility AC power side of the AC-DC power converter operating at ZVS-PWM strategy reduced and improved on the basis of sine wave like pulse frequency modulation and sine wave like pulse width modulation for the utility AC voltage source.<br/> Index Terms; Zero Voltage Soft Switching Inverter, High Voltage Transformer, Voltage Doubter, Non smoothing LC Filter, New Pulse Pattern Modulation.<br/>
Yamashita, N.,Gasnault, O.,Forni, O.,d'Uston, C.,Reedy, R.C.,Karouji, Y.,Kobayashi, S.,Hareyama, M.,Nagaoka, H.,Hasebe, N.,Kim, K.J. Elsevier 2012 Earth and planetary science letters Vol.353 No.-
<P><B>Abstract</B></P> <P>The first unambiguous global distribution of Ca on the Moon has been revealed by the Kaguya Gamma-Ray Spectrometer. The observation of the 3737keV gamma rays from <SUP>40</SUP>Ca with a high energy resolution Ge detector, corrected for fast neutrons, improved greatly our confidence in these remote sensing data. While the derived Ca abundance generally confirms the mare-highland dichotomy, we found that the eastern mare regions such as Crisium, Nectaris, and Fecunditatis exhibit unexpected high Ca abundances. This may be explained by regional concentrations of high-Ca clinopyroxene. Our Ca map also shows that the lowest CaO abundance found in the returned samples (∼8wt%) may actually be common in Oceanus Procellarum, suggesting the possible sampling bias of Apollo and Luna missions. These observational results on Ca serve as a complementary criterion for better characterization of mare regions on the Moon.</P> <P><B>Highlights:</B></P> <P>► Global distribution of Ca on the Moon is derived from Kaguya GRS data. ► Observation by high precision Ge detector greatly improved confidence in measurement. ► Ca was found to be more abundant in the east mare region than in the west. ► Selective concentration of high-Ca pyroxene in the eastern mare region is implied. ► Ca provides a complementary criterion to characterize the lunar thermal history.</P>