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:
May. 11, 2021
Filed:
Oct. 04, 2019
Rohm Co., Ltd., Kyoto, JP;
Hideo Hara, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
In an isolated DC-DC converter, in response to a switching transistor connected to the primary winding of a transformer turning off, a turn-on control circuit turns on a synchronous rectification transistor on the secondary side. A turn-off control circuit determines the turn-off time point of the synchronous rectification transistor by charging a capacitor with a current commensurate with the magnitude of an induced voltage appearing in the secondary wiring of the transformer during the on-period of the switching transistor and, after the synchronous rectification transistor turns on, discharging the capacitor with a current commensurate with the output voltage of the DC-DC converter.