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Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v
Kuroda, D.,Ishiguro, M.,Takato, N.,Hasegawa, S.,Abe, M.,Tsuda, Y.,Sugita, S.,Usui, F.,Hattori, T.,Iwata, I.,Imanishi, M.,Terada, H.,Choi, Y.-J.,Watanabe, S.-i.,Yoshikawa, M. Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3
Performance Characteristics of Single-Stage AC-DC Full-Bridge Converter
S. Hattori,F. Kurokawa,K. Ueno 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A single-stage ac-dc converter consisting of full-bridge converter is proposed for battery charger applications. Desired feature for the battery charger such as a low cost, small volume, high efficiency and high reliability are achieved by means of the proposed solution. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two-stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components. In this paper, a digital control single-stage ac-dc converter consisting of full-bridge converter and series connection of secondary transformer is presented in order to achieve downsizing, high efficiency, high power factor and high reliability for a battery charger. The feasibility and practical value of the proposed approach are verified by the experimental results from a 0.8 / 1.6kW product prototype.
Characteristic Analysis of Integrated Magnetic Component for Forward Converter
T. Shiraishi,F. Hattori,M. Ishitobi,E. Hiraki 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A power converter is required to be compact, lightweight and low loss, and the various approaches have thus been carried out so far. For a forward converters (FC) used for step-down of medium-capacity, many papers that aims at its miniaturization by coupling the isolation transformers and the output reactors have been reported. Each method of the integrated magnetic components (IMC) shows that the position of the windings and the gaps are different and the total volume becomes smaller than that before coupling. However, it is not clear which method should be adopted to obtain the desired performance and what kind of characteristics it can judge from. Therefore, we classified the FC’s IMC from the way of the coupling and investigate the operation of the FC depending on the winding of the IMC in this paper. As results from simulation and experimental analysis, the winding position suitable for the FC, the way of reducing the volume of the magnetic component and suppressing the ripple of the input/output current became clear.