Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

2006-05-30

2006-05-30

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S127000, C323S207000

Reexamination Certificate

active

07054167

ABSTRACT:
A switching power supply circuit achieves improvement of the power conversion efficiency while a high power factor is maintained, in which the power factor of a current resonance converter is improved by feeding back a switching output to a rectification current path to selectively interrupt the rectification current, thereby to expand the conduction angle of ac input current. This allows elimination of a power choke coil to achieve improvement of the power conversion efficiency. Further, the magnetic flux density of an insulating converter transformer is set lower than a predetermined level, so that secondary side rectification current normally maintains a continuous mode irrespective of a variation of the load or the input voltage. This decreases the power loss that appears when the secondary side rectification current is placed into a discontinuous mode and thereby achieves further improvement of the power conversion efficiency.

REFERENCES:
patent: 5353212 (1994-10-01), Loftus, Jr.
patent: 2003-189617 (2003-07-01), None

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