Switching power supply with power factor control

Details Switching power supply with power factor control Switching power supply with power factor control

1999-01-20

2000-08-22

Riley, Shawn

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

H02M 3335

Patent

active

06108218&

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.

REFERENCES:
patent: 5122946 (1992-06-01), Taylor
patent: 5673184 (1997-09-01), Rilly et al.
patent: 5757626 (1998-05-01), Jovanovic
patent: 5862043 (1999-01-01), Youn et al.
patent: 5883795 (1999-03-01), Farrington

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