Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

2007-12-18

2007-12-18

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S025000, C363S026000

Reexamination Certificate

active

10536742

ABSTRACT:
Enhancement of the power conversion efficiency and reduction of switching noise of a power supply circuit are achieved. The power supply circuit includes, on the primary side, a composite resonance type converter formed from a current resonance type converter and a partial voltage resonance circuit in combination, and is configured so as to produce a plurality of secondary side DC output voltages. A particular one of the plural secondary side DC output voltages is controlled to a constant voltage by variably controlling the switching frequency of a primary side switching converter. Each of the remaining secondary side DC output voltages is controlled to a constant voltage by adjusting the level of control current to be supplied to a controlling winding of a control transformer in response to the level of the secondary side DC output voltage to adjust the inductance of a controlling winding of the control transformer inserted in a rectification current path.

REFERENCES:
patent: 5317496 (1994-05-01), Seiersen
patent: 5459650 (1995-10-01), Noro
patent: 5777859 (1998-07-01), Raets
patent: 5999417 (1999-12-01), Schlecht
patent: 6587359 (2003-07-01), Raets et al.
patent: 2007/0024255 (2007-02-01), Yasumura
patent: 2002064981 (2002-02-01), None

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