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. 02, 2007
Filed:
Jan. 12, 2004
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 Maxell, Ltd., Ibaraki, JP;
Hitachi Computer Peripherals Co., Ltd., Kanagawa, JP;
Abstract
The present invention reduces the capacity of the AC-DC converter for the peak load and realizes low price and reduction in the volume of the power unit. The apparatus built-in backup power supply has the peak cut function for sharing a part of the load current at the time of peak load from the secondary battery. The two-way DC-DC converterand the secondary batteryare installed on the DC output side of the AC-DC converterand a current larger than a predetermined peak cut level is discharged from the secondary batteryat the time of peak load. Further, when the load is less than the predetermined cut level, the secondary batteryis charged from the AC-DC convertervia the two-way DC-DC converter. Furthermore, a most suitable peak cut level according to the SOC of the secondary battery and load pattern is automatically set and dynamically changed.