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:
Feb. 05, 2013
Filed:
May. 14, 2009
Applicant:
Junji Nishida, Osaka, JP;
Inventor:
Junji Nishida, Osaka, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/618 (2006.01); G05F 1/565 (2006.01);
U.S. Cl.
CPC ...
Abstract
A current sensing circuit configured to sense current flowing through a switching transistor of a non-insulated switching regulator, the current sensing circuit includes a voltage divider circuit portion; a first transistor; a first impedance element; a second transistor; a third transistor; and a first voltage comparing circuit portion, wherein control terminals of the first transistor, the second transistor, and the third transistor are connected to each other and a connecting portion of the control terminals is connected to a connecting portion between the third transistor and the first constant current source.