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:
Dec. 18, 2018
Filed:
Apr. 27, 2018
Fuji Electric Co., Ltd., Kawasaki-shi, Kanagawa, JP;
Hiroshi Maruyama, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, Kanagawa, JP;
Abstract
A switching power supply device includes a power factor correction (PFC) circuit, a DC-DC converter, and a control IC incorporating functions of controlling these components. At power up, a capacitor connected to a terminal VCC is charged with a current whose voltage has been adjusted by a starting circuit. When a voltage across the capacitor reaches a UVLO cancelation voltage, an under-voltage lockout (UVLO) circuit outputs a first enable signal, thereby driving a PFC control circuit. When the PFC control circuit outputs a PFC switching signal, a PFC switching detection circuit outputs a second enable signal, thereby driving an LLC control circuit. Since the time between the start of the PFC switching operation and the start of the operation of the LLC control circuit is shortest, there is no need to supplement the starting power and arrange an auxiliary winding for an inductor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile