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:
Jan. 20, 2009
Filed:
Jul. 24, 2007
Akihisa Kataoka, Saitama, JP;
Tomotsugu Ishizuka, Tokyo, JP;
Koichi Hidese, Tokyo, JP;
Shigeru Tanaka, Tokyo, JP;
Akihisa Kataoka, Saitama, JP;
Tomotsugu Ishizuka, Tokyo, JP;
Koichi Hidese, Tokyo, JP;
Shigeru Tanaka, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A control apparatus for controlling a three- or single-phase semiconductor power converter employing fixed-pulse switching patterns superposes a DC component on an AC output voltage, to suppress asymmetrical magnetization of a transformer connected to the power converter. The three-phase semiconductor power converterprovides an AC output. The voltage of the AC output is changed by the transformer. The control apparatusfor controlling the power converterincludes an asymmetrical magnetization suppressive controllerto generate a correction value for each of basic fixed-pulse switching patterns to be applied to three-phase switching elements of the power converter, a phase correctorto switch the correction values from one to another at timing when no switching operation is carried out at any one of the switching elements, and a pattern generatorto correct the basic fixed-pulse switching patterns according to the correction value provided by the phase correctorand provide the corrected switching patterns.