Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

2007-01-02

2007-01-02

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S098000

Reexamination Certificate

active

10534609

ABSTRACT:
A switching power supply circuit having a power factor improving function that makes it possible to improve power conversion efficiency and reduce size and weight of the circuit. A complex resonant converter is formed by at least combining a current resonant converter of a half-bridge coupling system on a primary side with a partial resonant voltage circuit. Power factor improvement is made by performing voltage feedback of a switching output of the complex resonant converter to a rectification current path by a power factor improving transformer (a loosely coupled transformer VFT), interrupting a rectification current by a rectifier diode, and thereby increasing a conduction angle of an alternating input current. Thus, for example, the power supply circuit having a power factor improving circuit does not need to employ a configuration in which a choke coil is inserted in a commercial alternating-current power supply line.

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