| 摘要 |
A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc 1 , in which a primary winding 5 a of a transformer T, a reactor L 3 and a first switch Q 1 are connected in series; a second series circuit, connected to both terminals of the primary winding 5 a and the reactor L 3 , which includes a switch Q 2 and a capacitor C 3 ; a smoothing circuit D 1 , D 2 , L 1 , C 4 ; and a control circuit 10 alternately turning on and turning off the switches Q 1 , Q 2 . The transformer T includes: a main core 21 , formed with a magnetic circuit, on which the primary and secondary windings 5 a, 5 b are wound with a given gap 23 ; and a plurality of auxiliary cores 24 a, 24 b disposed in the given gap 23 with a given distance in a circumferential direction of the primary winding 5 a. Further, the reactor L 3 is formed of a leakage inductance of the transformer T.
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