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Hiroaki Tanimatsu,Kenji Yasui,Izuo Hirota,Toshiaki Iwai,Hideki Omori,Katsumi Nishida,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a two-switch boost-half bridge one stage topology of commercial single-phase utility AC-grid interfaced soft switching pulse modulation high-frequency inverter with active power filtering function, which is more acceptable for consumer IH cooking heater and steamer. The commercial utility AC mains connected boost-half bridge type high-frequency inverter circuit with lossless snubbing capacitors is mainly composed of a single<br/> stage power conversion processing combined by discontinuous<br/> current mode (DCM) PFC power converter due to boost chopper and a constant frequency ZVS-PWM controlled SEPP series resonant high-frequency inverter with induction heated load such as rice cooker, floor heating steamer, and fixing heating drum roller in copy and printer equipment. This two-switch boost-half bridge type one stage power conversion processing includes some advantageous points as simple configuration, low cost, harmonic current reduction with unity power factor, and soft switching operation. Its operating principle is described and discussed herein. In<br/> addition to these, the operating performances of utility AC-HFAC power frequency converter treated here are illustrated on the basis of simulation and experimental results. Its practical effectiveness for consumer IH cooker and hot water producer is proved from an experimental point of view.
Hisayuki Sugimura,Kenji Yasui,Hideki Omori,Hyun-Woo Lee,Mutsuo Nakaoka 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
At present, the cold cathode fluorescent lamp (CCFL) using mercury lamp has been generally used for liquid crystal backlight source of personal computer and car navigation and so on. This kind of lamp is more excellent on luminance performance and cost. However, the requirements of liquid crystal backlight due to a light source without mercury have been strongly increased from a viewpoint of the actual influence on environmental preservation and environmental recycling. As fluorescent lamp without mercury, Dielectric Barrier Discharge based rare gas fluorescent lamp (DBD-FL) using xenon (Xe) gas has been studied so far. This DBD lamp has no influence on the human body and environmental recycle. Its operating life is long because electrode IS out. In this paper the simulation and experimental results of soft switching high frequency inverter with reverse blocking single switch as a high frequency power supply circuit for DBD-FL using Xe gas are comparatively evaluated and discussed from a practical point of view.
Masahiro Nakao,Kenji Yasui,Izuo Hirota,Toshiaki Iwai,Hideki Omori,Hyun Woo Lee,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents the soft switching duty cycle controlled AC-AC direct high frequency cycloconversion circuit for consumer induction heated cooker and steamer, which has unity power factor and sinewave line current shaping functions. The proposed commercial utility frequency AC (LFAC) to high frequency AC (HFAC) cycloconverter can be composed of minimum circuit components for resonance, filter and diodes, which is possible to implement effective miniaturization, low cost, reliability, high efficiency,<br/> downsizing because of the non-electrolytic capacitor at zero<br/> voltage soft switching commutation scheme. In addition, this paper describes the operating principle and its unique features of LFAC-HFAC cycloconverter circuit. Finally its power regulation characteristics in HFAC side in addition to utility AC side sinewave current quality and unity PFC are evaluated and discussed from a simulation point of view. Its practical effectiveness of this direct frequency cycloconverter is proven for consumer induction heated appliances in home and business usages.
Kazuhiro Nakaso,Yoshiki Adachi,Emi Fusayasu,Koji Doi,Keiko Imamura,Kenichi Yasui,Kenji Nakashima 대한신경과학회 2012 Journal of Clinical Neurology Vol.8 No.3
Background Leber’s hereditary optic neuropathy (LHON) is a mitochondrial disorder with optic nerve atrophy. Although there are no other associated neurological abnormalities in most cases of LHON, cases of “LHON plus” have been reported. Case Report The proband was a 37-year-old man who had visual and gait disturbances that had first appeared at 10 years of age. He showed horizontal gaze palsy, gaze-evoked nystagmus, dysarthria,and cerebellar ataxia. Brain and orbit MRI disclosed atrophy of the optic nerve and cerebellum,and degenerative changes in the bilateral inferior olivary nucleus. Mutational analyses of mitochondrial DNA identified the coexistence of heteroplasmic G11778A and homoplasmic T3394C mutations. Conclusions These results suggest that the combination of G11778A and T3394C mutations leads to an atypical LHON phenotype.