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. 14, 2019
Filed:
Feb. 11, 2016
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Jun Yabuzaki, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A switching power supply device having a synchronous rectifier IC on a secondary side, responds to an anomaly on a primary side based on detecting an occurrence of the anomaly on the secondary side. When a secondary side synchronous rectifier IC detects an anomaly, a current is output from the anomaly-time current output terminal of the secondary side synchronous rectifier IC. By the output current flowing through a resistance, a voltage at an output voltage detection point is raised to increase a current through the cathode of a shunt regulator. In so doing, a current flowing through a photodiode of a photocoupler also increases, and the FB terminal voltage of a switching control IC connected to a primary side phototransistor decreases. The primary side switching control IC operates to minimize output power, reduces a secondary side output voltage, or stops an operation of the switching power supply device.