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. 25, 2022
Filed:
Oct. 18, 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);
U.S. Cl.
CPC ...
H02J 9/061 (2013.01); H02J 9/062 (2013.01); H02M 1/0019 (2021.05);
Abstract
In an uninterruptible power supply apparatus, a bidirectional chopper () includes a first IGBT (Q) for storing DC power generated by a converter () into a battery () and a second IGBT (Q) for supplying DC power of the battery to an inverter (). A control circuit () drives the first IGBT at a first frequency (fH) in a sound state of a commercial AC power supply () and drives the second IGBT at a second frequency (fL) lower than the first frequency in response to occurrence of a power failure of the commercial AC power supply. Switching loss produced in the second IGBT thus can be reduced.