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. 12, 2005
Filed:
Apr. 07, 2003
Kazuhiro Oki, Nagano, JP;
Shizuko Hiryu, Shiga, JP;
Yoshiaki Kohno, Shiga, JP;
Toshitsugu Mito, Yamato, JP;
Tetsuya Hinata, Tokyo, JP;
Kazuhiro Oki, Nagano, JP;
Shizuko Hiryu, Shiga, JP;
Yoshiaki Kohno, Shiga, JP;
Toshitsugu Mito, Yamato, JP;
Tetsuya Hinata, Tokyo, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A switching power supply unit which contains a secondary battery for backup and a circuit for controlling the charging and discharging of the secondary battery in its enclosure and which properly manages the charging and discharging of the secondary battery. A switching power supply circuit includes a rectifying and smoothing circuit for smoothing alternating-current input from commercial power supply Vin at normal operation time, a battery pack charged by a DC—DC converter which can continuously output a predetermined direct-current power supply voltage for supplying power supply voltage to the DC—DC converter at the time of a stoppage in alternating-current input, a charging circuit section for controlling the charging and discharging of the battery pack, and a charging and discharging control circuit. The battery pack and circuits, such as the DC—DC converter, are mounted in the same unit enclosure.