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. 29, 2009
Filed:
Nov. 29, 2004
Minoru Sugiyama, Hyogo-ken, JP;
Minoru Sugiyama, Hyogo-ken, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A power supply apparatus includes a switching transistor, a transistor control circuit, and a reference voltage generator. The switching transistor performs a switching operation for converting an input source voltage to an output power voltage according to a control signal. The transistor control circuit generates the control signal based on a reference voltage and a feedback voltage associated with the output power voltage. The reference voltage generator generates the reference voltage, increases the reference voltage in a phased manner to increase the output power voltage in a phased manner to a desired value, and decreases the reference voltage to decrease the output power voltage. A power supply method is also described.