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. 09, 2006
Filed:
Sep. 20, 2002
Albino Pidutti, Udine, IT;
Claudio Adragna, Monza, IT;
Albino Pidutti, Udine, IT;
Claudio Adragna, Monza, IT;
STMicroelectronics s.r.l., Agrate Brianza, IT;
Abstract
A power factor correction device for switching power supplies is described, which comprises a converter () and a control device () coupled with said converter () in such a way as to obtain from a input network alternated voltage (Vin) a direct regulated voltage (Vout) at the output terminal. The converter () comprises a power transistor (M) and the control device () comprises an error amplifier () having in input at the inverting terminal a first signal (Vr) proportional to said regulated voltage (Vout) and at the non-inverting terminal a voltage reference (Vref), at least one capacitor (C) having a first terminal and a second terminal which are coupled respectively with the inverting terminal and the output terminal () of the error amplifier () and a driving circuit () of said power transistor (M) which is coupled with the second terminal of said capacitor (C). The control device () comprises interruption means (SW) placed between the output terminal () of said error amplifier () and the second terminal of said capacitor (C) and control means () able to activate said interruption means (SW) so as to control the interruption of the connection between the error amplifier () and said driving circuit () for at least one time period (T) lower than the time period (Tciclo) in which said control device () is operative.