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. 11, 2003
Filed:
Aug. 03, 2001
Applicant:
Inventor:
Umeo Oshio, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/06 ; H02M 3/18 ;
U.S. Cl.
CPC ...
H02M 3/06 ; H02M 3/18 ;
Abstract
A DC-DC converter includes N capacitors having identical capacitances, initially coupled in series, and supplied with an external power supply voltage to be charged thereby, and an circuit for coupling the N capacitors in parallel and varying a duty ratio of a charging timing, so as to vary an internal power supply voltage which is output from the DC-DC converter.