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. 27, 2016
Filed:
Jun. 15, 2015
Sanken Electric Co., Ltd., Niiza-Shi, Saitama, JP;
Akira Hayakawa, Fujimino, JP;
Masaaki Shimada, Fujimi, JP;
SANKEN ELECTRIC CO., LTD., Niiza-shi, JP;
Abstract
A switched-mode power supply device is disclosed including an AC power supply, a transformer including a primary winding and a secondary winding, a switching element electrically connected to the primary winding, a secondary-side rectifying and smoothing circuit that generates an output voltage by rectifying and smoothing the pulse voltage, a load ratio detection circuit that detects if a load ratio is not greater than a load ratio threshold value during steady load, and outputs a drive switch signal based on the detection, and a drive circuit that, on the basis of the drive switch signal, causes the switching element to perform switching operation in one of a normal drive in which a speed of charging a gate voltage is faster and a soft drive in which the speed of charging the gate voltage is slower.