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:
Feb. 09, 2016
Filed:
Jun. 28, 2013
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Masahiko Sakurai, Hino, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A synchronous rectification switching power source device accurately determines the timing of the turning off of a synchronous rectifier switching element regardless of the state of the load, and a synchronous rectification period is utilized to the maximum. The switching power source device is configured of a main FET connected to a primary winding of a transformer, a snubber circuit connected to the primary winding, a synchronous rectifier FET connected to a secondary winding of the transformer, a diode connected to the synchronous rectifier FET, a synchronous rectifier FET drain voltage detection unit, an output voltage detection unit, and a drive control unit. The drive control unit accurately determines the timing of the turning off of the synchronous rectifier switching element using a unit that detects the on/off state of the main FET, a variable pulse generator unit, a count value generated by a counter unit, and a threshold value.