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:
Aug. 22, 2000
Filed:
Jan. 20, 1999
Seiki Igarashi, Tokyo, JP;
Akio Suzuki, Tokyo, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
A switching power supply for achieving a high power factor includes a rectifier Rect 1, a DC voltage source (capacitor) C1, a transformer TR1, a diode D6; a diode D7 a semiconductor switch Q1, and a inductor L1. The DC voltage source C1 is connected to an AC power supply AC via the rectifier Rect1. The transformer TR1 includes a primary winding N1, a secondary winding N2 and a tertiary winding N3. The transformer TR1 and the semiconductor switch Q1 are used to output an insulated DC voltage from the DC voltage source C1. The tertiary winding N3 is between the output of the rectifier Rect1 and the DC voltage source C1. The diodes D6 and D7 are connected to the respective input terminals of an AC power supply. The inductor L1 is connected between the output of the diodes D6, D7 and the semiconductor switch Q.