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:
Mar. 29, 2011
Filed:
Jul. 24, 2008
Yoshiyuki Inoue, Osaka, JP;
Yoshiyuki Inoue, Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A step-up DC-DC converter is disclosed that is capable of high efficiency power conversion under both a heavy load condition and a light load condition. The step-up DC-DC converter includes a direct current power source, an inductor, a first switching element, a second switching element, a smoothing capacitor, a driver controller for controlling switching ON or switching OFF the first switching element and the second switching element, and a control changing unit for changing a control operation of the driver controller according to a load current. According to an output from the control changing unit, the driver controller performs one of an operation of switching OFF the second switching element and an operation of switching ON or switching OFF the second switching element.