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:
Dec. 28, 1993
Filed:
Dec. 20, 1990
Applicant:
Inventors:
Shin Kimura, Hitachi, JP;
Yasuo Matsuda, Eastchester, NY (US);
Norikazu Tokunaga, Hitachi, JP;
Mutsuhiro Mori, Hitachi, JP;
Toshiki Kurosu, Hitachi, JP;
Yutaka Suzuki, Hitachi, JP;
Naoki Sakurai, Hitachi, JP;
Yasumichi Yasuda, Hitachi, JP;
Tomoyuki Tanaka, Hitachi, JP;
Kenichi Onda, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ; H03K / ;
U.S. Cl.
CPC ...
363 56 ; 363132 ; 363147 ; 307584 ;
Abstract
In a module using a high-speed switching element such as an IGBT for a high-speed inverter, a matching condition is established between the switching characteristic of the IGBT and the recovery characteristic of the diode to be connected thereto in an anti-parallel fashion. As a result, the oscillating voltage appearing in the inverter circuit is suppressed to prevent erroneous operation of the inverter system.