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:
Aug. 13, 2024
Filed:
Nov. 28, 2019
Applicant:
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Inventors:
Kohji Maki, Tokyo, JP;
Yoshitaka Iwaji, Tokyo, JP;
Hironori Ohashi, Tokyo, JP;
Atsuhiko Nakamura, Tokyo, JP;
Assignee:
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 29/024 (2016.01); G01R 31/34 (2020.01); H02H 5/04 (2006.01); H02M 1/00 (2006.01);
U.S. Cl.
CPC ...
G01R 31/343 (2013.01); H02H 5/041 (2013.01); H02M 1/0009 (2021.05); H02P 29/0241 (2016.02);
Abstract
This power conversion device has: a current measurement unit for measuring phase current; a current vector calculation unit for calculating a current vector by performing 3-phase to 2-phase conversion on the phase current; an amount-to-be-analyzed calculation unit for calculating, on the basis of the current vector, an amount to be analyzed; and a feature amount waveform extraction unit for extracting a waveform in a specific frequency range on the basis of the amount to be analyzed.