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:
Jun. 08, 2010
Filed:
Feb. 26, 2007
Power supply device capable of supplying large amount of power necessary for entire system operation
Tetsuya Yano, Yokohama, JP;
Kazuo Ogawa, Yokohama, JP;
Toshitaka Semma, Yamato, JP;
Yoshihisa Kimura, Kawasaki, JP;
Kazuhito Kishi, Yokohama, JP;
Tetsuya Yano, Yokohama, JP;
Kazuo Ogawa, Yokohama, JP;
Toshitaka Semma, Yamato, JP;
Yoshihisa Kimura, Kawasaki, JP;
Kazuhito Kishi, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A power supply device includes a first power-supply unit to input external power and to output first power supplying a predetermined constant voltage to a load, a second power-supply unit to accumulate charge and to output second power to the load in parallel with the first power being supplied from the first power-supply unit, and a controller to output a control signal to prevent the second power-supply unit from supplying power in case of a current increase due to a dynamic load change, and to cause the first power-supply unit to supply power for the dynamic current increase. The first power-supply unit supplies power having a current value smaller than a predetermined maximum current of the first power-supply unit. The second power-supply unit supplies power for a shortfall current exceeding the predetermined maximum current of the first power-supply unit.