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:
Oct. 21, 1997
Filed:
Dec. 19, 1994
Applicant:
Inventors:
Kouji Yasuda, Hitachinaka, JP;
Kiyoshi Nakata, Iwase-machi, JP;
Masato Suzuki, Urizura-machi, JP;
Mutsuhiro Terunuma, Mito, JP;
Assignee:
Hitachi, Ltd., , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 41 ; 363 98 ;
Abstract
A two level inverter having a switching element the switching frequency of which is higher than that of GTO, and providing a continuous control substantially over a full range of output voltages wherein the two level inverter comprises as its pulse modes an asynchronous bipolar modulation mode, a multi-pulse mode of an overmodulation mode, and a one pulse mode, and wherein advantageously the multi-pulse mode and the one pulse mode are arranged to be changed, thereby to enable a continuous control of its output voltage and reduce tone changes in the magnetic noise as well.