The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2003
Filed:
Sep. 20, 2001
Seiji Ishida, Hitachi, JP;
Toshiaki Okuyama, Tokai, JP;
Takashi Ogawa, Mito, JP;
Tetsuo Kojima, Hitachinaka, JP;
Kiyoshi Nakata, Iwase, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Filter capacitor voltage “Ecf ” is detected and then after d-axis voltage correction value “dvd”, q-axis voltage correction value “dvq”, q-axis current correction value “diq”, and frequency correction value “d&ohgr; ” have been computed from the AC components of “Ecf ” and the results have been added to the corresponding d-axis voltage command, q-axis voltage command, q-axis current, and frequency command, the DC current of the power converter is controlled. Thus, the AC components included in the DC current are offset and the AC components are suppressed effectively.