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:
Jul. 17, 2007
Filed:
May. 31, 2005
Hirokazu Tokuda, Tokyo, JP;
Nobuyuki Kobayashi, Tokyo, JP;
Yasuhiro Okuma, Hyogo, JP;
Hiroyuki Matsuo, Hyogo, JP;
Osamu Hashimoto, Hyogo, JP;
Hirokazu Tokuda, Tokyo, JP;
Nobuyuki Kobayashi, Tokyo, JP;
Yasuhiro Okuma, Hyogo, JP;
Hiroyuki Matsuo, Hyogo, JP;
Osamu Hashimoto, Hyogo, JP;
Fuji Electric Systems Co., Ltd., Tokyo, JP;
Abstract
A power conversion apparatus includes serially connected arms U and X, serially connected arms V and Y, serially connected arms W and Z, and a capacitor, the pairs of serially connected arms and the capacitor all connected in parallel to one another. The input-side arms U and X and the output-side arms W and Z are subjected to PWM control so that the arms W and Z are controlled to have a voltage that is lower than that of the arms U and X, thereby providing a step down operation. A step up operation also can be provided by an opposite relation in which the arms W and Z are controlled to have a voltage that is higher than that of the arms U and X, thereby to expand the range within which the output voltage is controlled with the effect of reducing distortion.