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. 08, 2018
Filed:
Jan. 05, 2016
Fuji Electric Co., Ltd., Kawasaki, JP;
Jian Chen, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki, JP;
Abstract
A switching power supply device includes an energy storage element which is charged with a voltage generated in an auxiliary winding of a transformer; a switching control circuit to which the terminal voltage of the energy storage element is given as a power supply voltage and which controls the switching operation of a switching element; an initial operation control circuit which, when it is detected that the power supply voltage is lower than a first voltage, causes a current supply circuit to stop the switching operation until the power supply voltage rises to a second voltage; and a switching suppression circuit which, when it is detected that the power supply voltage is lower than a third voltage which is higher than the first voltage and lower than the second voltage, causes the current supply circuit to stop the switching operation for a predetermined period.