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:
Nov. 03, 2009
Filed:
Aug. 05, 2005
Hiroyuki Eguchi, Wako, JP;
Motohiro Shimizu, Wako, JP;
Hiroyuki Eguchi, Wako, JP;
Motohiro Shimizu, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
This invention realizes control without using a current-detecting element to prevent over current from flowing into a switching element of a switching converter in response to an input primary voltage from a small-capacity DC power source. The switching converter includes an FETthat turns the input primary voltage from the DC power sourceon and off, and a choke coilthat is charged or discharged according to turning on/off of this FET. A driverdrives the FET so that an output voltage detected by an output voltage detectoris converged to a target voltage. A means for calculating a current I that flows into the FETbased on a duty ratio of the input primary voltage and the FETand the inductance of the choke coil. The driverdrives the FETat a duty ratio set so as to prevent the estimated current value I from exceeding a permissible current value or stops driving when the estimated current value I is equal to or more than the permissible current value.