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:
May. 31, 2011
Filed:
Aug. 11, 2008
Yoshiyuki Inoue, Osaka, JP;
Yoshiyuki Inoue, Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed boost DC/DC converter includes a direct-current power source, of which a negative terminal is connected to ground; an inductor connected to a positive terminal of the direct-current power source; a first switching element connected between the inductor and ground and having a control node for controlling an on-resistance thereof; a second switching element connected in series to the inductor and having a control node for controlling an on-resistance thereof; a smoothing capacitor connected between the second switching element and ground; a switching circuit configured to select a voltage of the direct-current power source during a start-up phase, and to select an output voltage of the smoothing capacitor after the start-up phase; and a control unit configured to cause the switching circuit to apply the voltage selected by the switching circuit to the control node of each of the first and the second switching elements at a predetermined cycle.