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:
Jul. 29, 2025
Filed:
Feb. 24, 2023
Fuji Electric Co., Ltd., Kawasaki, JP;
Ryuunosuke Araumi, Hino, JP;
Ryuji Yamada, Hachioji, JP;
FUJI ELECTRIC CO., LTD., Kawasaki, JP;
Abstract
A switching control circuit for a power supply circuit that includes an inductor configured to receive a rectified voltage corresponding to an alternating current (AC) voltage, and a transistor configured to control a current flowing through the inductor, the power supply circuit generating an output voltage from the AC voltage, the switching control circuit being configured to switch the transistor. The switching control circuit comprises: a signal output circuit configured to output a signal to turn on the transistor, after lapse of a first time period since the inductor current reaches a first predetermined value after the transistor is turned off, the first time period corresponding to a conduction period during which a parasitic diode of the transistor conducts; and a driver circuit configured to turn on the transistor based on the signal, and turn off the transistor, based on a feedback voltage corresponding to the output voltage.