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:
May. 11, 2021
Filed:
Apr. 03, 2017
Applicant:
Toshiba Mitsubishi-electric Industrial Systems Corporation, Chuo-ku, JP;
Inventor:
Masaru Toyoda, Chuo-ku, JP;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
H02J 9/06 (2006.01); H02M 1/00 (2006.01); H02M 5/458 (2006.01); H02M 7/5387 (2007.01);
U.S. Cl.
CPC ...
H02M 5/4585 (2013.01); H02J 9/06 (2013.01); H02M 1/00 (2013.01); H02M 7/53871 (2013.01); H02M 2001/0009 (2013.01); H02M 2001/0054 (2013.01);
Abstract
When a load current is larger than a predetermined value, a control device of an uninterruptible power supply device controls an inverter by gate signals having a relatively high frequency and having controlled pulse widths, and when the load current is smaller than the predetermined value, the control device controls the inverter by the gate signals having a relatively low frequency and having fixed pulse widths. Therefore, when a load is a light load, switching losses occurring in IGBTs of the inverter can be decreased.