Switching power supply device

Details Switching power supply device Switching power supply device

2004-06-14

2008-07-29

Sterrett, Jeffrey L. (Department: 2838)

Electric power conversion systems

Current conversion

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

C336S160000, C336S165000, C336S212000, C323S250000, C323S307000, C323S331000

Reexamination Certificate

active

07405951

ABSTRACT:
A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc1, in which a primary winding5aof a transformer T, a reactor L3and a first switch Q1are connected in series; a second series circuit, connected to both terminals of the primary winding5aand the reactor L3, which includes a switch Q2and a capacitor C3; a smoothing circuit D1, D2, L1, C4; and a control circuit10alternately turning on and turning off the switches Q1, Q2. The transformer T includes: a main core21, formed with a magnetic circuit, on which the primary and secondary windings5a,5bare wound with a given gap23; and a plurality of auxiliary cores24a,24bdisposed in the given gap23with a given distance in a circumferential direction of the primary winding5a. Further, the reactor L3is formed of a leakage inductance of the transformer T.

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