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:
Dec. 20, 2005
Filed:
Apr. 28, 2003
Akihiko Kanouda, Hitachinaka, JP;
Satoru Masuyama, Odawara, JP;
Masato Isogai, Mito, JP;
Ryouhei Saga, Takasaki, JP;
Kenichi Onda, Takasaki, JP;
Norikazu Tokunaga, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Satoru Masuyama, Odawara, JP;
Masato Isogai, Mito, JP;
Ryouhei Saga, Takasaki, JP;
Kenichi Onda, Takasaki, JP;
Norikazu Tokunaga, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Maxwell, Ltd., Ibaraki, JP;
Hitachi Computer Peripherals Co., Ltd., Kanagawa, JP;
Abstract
Apparatus built-in backup power supply system has a 'peak cut' function for sharing a part of the load current at the time of a peak load using a secondary battery. For this purpose, a two-way DC—DC converterand the secondary batteryare installed on the DC output side of the AC-DC converterand that portion of the load current that exceeds a predetermined peak cut level is discharged from the secondary batteryduring peak loading. When the load is less than the predetermined cut level, the secondary batteryis charged from the AC-DC convertervia the two-way DC—DC converterA suitable peak cut level is determined according to the state of charge of the secondary battery and load pattern, and is changed dynamically.