Keizo Shimada
Hitachi
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Keizo Shimada.
power conversion conference | 1997
A. Kanouda; Yoshimi Sakurai; Kenji Kubo; Keizo Shimada; Hideaki Kunisada; K. Umetsu
A fully digital-controlled three-phase UPS (uninterruptible power system) is developed which does not have an inverter-transformer. To remove the transformer, a different type of main circuit from the conventional UPS is adopted. One phase of the input AC is regarded as the common voltage of the main circuit. A DC voltage stabilizer solves problems caused when this transformerless circuit is applied to the UPS. A digital controller with two RISC (Reduced Instruction Set Computer) processing microcomputers to operate the circuit is also proposed. Experiments show the THD (total harmonic distortion) of the input current is less than 5%, and that of the output voltage is less than 3.6% under nonlinear load.
Archive | 2010
Akira Kikuchi; Takashi Ikimi; Keizo Shimada; Naoshi Sugawara
Archive | 1993
Hidefumi Shirahama; Yorito Jifuku; Akira Kobayashi; Keizo Shimada; Norikazu Tokunaga; Yoshimi Sakurai; Ikuo Yamato; Tomoaki Mino; Satoru Inukai
Archive | 2007
Akira Kikuchi; Takashi Ikimi; Keizo Shimada; Naoshi Sugawara
Archive | 1997
Keizo Shimada; Hideyasu Umetsu; Hideaki Kunisada
Archive | 2008
Naoshi Sugawara; Tetsuhiro Fujimoto; Yasuhiro Kiyofuji; Keizo Shimada; Akira Kikuchi; Kazuhiro Imaie
Archive | 1996
Hideaki Kunisada; Keizo Shimada; Hideyasu Umetsu; 秀明 国貞; 恵三 嶋田; 秀恭 梅津
Archive | 2005
Tetsuhiro Fujimoto; Takashi Ikimi; Teru Kikuchi; Yasuhiro Kiyofuji; Masaki Sasaki; Keizo Shimada; Naoshi Sugawara; 高志 伊君; 正貴 佐々木; 恵三 嶋田; 康弘 清藤; 直志 菅原; 輝 菊池; 哲弘 藤本
Archive | 1990
Akira Kobayashi; Keizo Shimada
Archive | 2005
Kazuhiro Imaie; Yasuhiro Kiyofuji; Keizo Shimada; Naoshi Sugawara; Takashi Yagyu; 和宏 今家; 恵三 嶋田; 隆 柳生; 康弘 清藤; 直志 菅原
