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. 08, 2016
Filed:
Aug. 18, 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 transformer comprises a primary winding to which a DC voltage is applied and a secondary winding. A switching circuit is connected to the primary winding. A rectifying-smoothening circuit rectifies and smoothens a pulse voltage generated at the secondary winding, by switching the switching element. An output unit outputs an output voltage obtained by the rectifying-smoothening circuit to a load. An error amplifier outputs an error voltage between the output voltage and a reference voltage to a primary side as a feedback signal. an oscillator lowers a switching frequency of the switching element in accordance with the feedback signal during a light load state. A frequency correction circuit corrects the switching frequency by the oscillator by changing a frequency correction rate in accordance with a value of the feedback signal along an approximate line along which the transformer is not saturated.