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:
Apr. 13, 2010
Filed:
Jul. 31, 2007
Yasuhiro Tamai, Hino, JP;
Tatsuya Yamada, Suzuka, JP;
Yasuhiro Tamai, Hino, JP;
Tatsuya Yamada, Suzuka, JP;
Fuji Electric Systems Co., Ltd., Tokyo, JP;
Abstract
A control apparatus for an AC-AC direct converter. The control apparatus includes a calculator providing a phase command θ* of an output voltage of the converter, a calculator providing a q-axis current iby using output currents iand iand the phase command θ*, a detector detecting a pulsation component contained in the q-axis current i, a calculator providing a phase correction magnitude θso as to decrease the pulsation component, and an adder/subtractor correcting the phase command θ* by using the correction magnitude θ. This apparatus can decrease the output voltage distortion and low frequency torque pulsation and can suppress the increase of an output current without weakening a magnetic flux, even when the converter is operated in an overmodulation region.