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:
Sep. 22, 2015
Filed:
Aug. 19, 2014
Oki Data Corporation, Tokyo, JP;
Toru Kosaka, Tokyo, JP;
Oki Data Corporation, Tokyo, JP;
Abstract
A power-supply device includes: a rectifier circuit configured to output a rectified voltage by rectifying an output from a transformer; a comparator circuit configured to compare a comparison voltage corresponding to an output voltage or an output current that are generated based on the rectified voltage with the indicator voltage and to control an operation of the transformer drive circuit so as to reduce the difference between the comparison voltage and the indicator voltage; a constant voltage element configured to limit the output voltage or the output current by operating as a constant voltage source when the value of the output voltage or the output current reaches a threshold; and a current mirror circuit. The current mirror circuit is configured to lower the indicator voltage by allowing a current proportional to the current flowing through the constant voltage element to flow through the current path.