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. 02, 2015
Filed:
Oct. 16, 2012
Mikio Nakajima, Kanagawa, JP;
Tetsuya Yano, Kanagawa, JP;
Hideo Nakagawa, Kanagawa, JP;
Yu Yoshioka, Kanagawa, JP;
Mikio Nakajima, Kanagawa, JP;
Tetsuya Yano, Kanagawa, JP;
Hideo Nakagawa, Kanagawa, JP;
Yu Yoshioka, Kanagawa, JP;
RICOH COMPANY, LIMITED, Tokyo, JP;
Abstract
A power supply device includes: a main power supply configured to feed power to a load with constant-voltage output using an external power supply; an auxiliary power supply configured to feed power to the load using an internal power storage unit; a constant-current/constant-voltage switching power supply configured to feed a part of current flowing through the load by which part the current exceeds an upper limit value of output current of the main power supply instructed by a current upper-limit instruction unit, with the constant-current output from the auxiliary power supply; and an output switching unit switching the constant-current/constant-voltage switching power supply from the constant-current output to the constant-voltage output when a power cut monitoring unit determines stop of power supply from the external power supply.