Power factor correction device for switching power supplies

Details Power factor correction device for switching power supplies Power factor correction device for switching power supplies

2006-05-09

2006-05-09

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

Reexamination Certificate

active

07042743

ABSTRACT:
A power factor correction device for switching power supplies is described, which comprises a converter (20) and a control device (100; 200; 300) coupled with said converter (20) 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 (20) comprises a power transistor (M) and the control device (100; 200; 300) comprises an error amplifier (3) 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 (31) of the error amplifier (3) and a driving circuit (4–6) of said power transistor (M) which is coupled with the second terminal of said capacitor (C). The control device (100; 200; 300) comprises interruption means (SW) placed between the output terminal (31) of said error amplifier (3) and the second terminal of said capacitor (C) and control means (103; 103, 301–303) able to activate said interruption means (SW) so as to control the interruption of the connection between the error amplifier (3) and said driving circuit (4–6) for at least one time period (T) lower than the time period (Tciclo) in which said control device (100; 200; 300) is operative.

REFERENCES:
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patent: 5359276 (1994-10-01), Mammano
patent: 5619405 (1997-04-01), Kammiller et al.
patent: 6178104 (2001-01-01), Choi
patent: 6259613 (2001-07-01), Lee et al.
patent: 6728121 (2004-04-01), Ben-Yaakov et al.
patent: 6970365 (2005-11-01), Turchi

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