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:
Oct. 21, 2003
Filed:
Dec. 04, 2001
Applicant:
Inventors:
Sumiko Seki, Tokyo, JP;
Takahiko Ito, Tokyo, JP;
Assignee:
NEC Tokin Corporation, Sendai, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02M 7/00 ; H02M 7/5387 ; G05F 1/24 ;
U.S. Cl.
CPC ...
H02M 7/00 ; H02M 7/5387 ; G05F 1/24 ;
Abstract
A symmetrical DC/DC converter selects an energy transferring direction and a step-up or a step-down operation as well as a desired step-up or a step-down ratio. The converter includes a single inductor with a pair of switching devices connected to its terminals in a symmetrical arrangement with respect to the inductor. The converter is operable as a step-up converter and a step-down converter in a manner such that one and the other of the switching devices are used as an input switch and an output switch, respectively, and that one and the other of the switching devices are conversely used as an output switch and an input switch, respectively.