| 摘要 |
A switching power source apparatus has a series circuit connected to both ends of a DC power source Vdc 1 and having a reactor L 3 , a primary winding 5 a of a transformer T, and a switch Q 1 , a series circuit connected to both ends of the primary winding and having an auxiliary switch Q 2 and a clamp capacitor C 3 , a saturable reactor SL 1 connected in parallel with the primary winding, a rectifying-smoothing circuit D 1 , D 2 , L 1 , C 4 for rectifying and smoothing a voltage generated on a secondary winding 5 b, and a control circuit 10 for alternately turning on/off the switches Q 1 and Q 2 and turning off the switch Q 2 if a current of the switch Q 2 increases due to saturation of the saturable reactor SL 1 . The reactor L 3 is made of leakage inductance between the primary and secondary windings. In the transformer T, the primary winding is divided into two sections that are connected in series, the secondary winding is arranged between the two sections of the primary winding, and the numbers of turns of the two sections of the primary winding are adjusted to adjust the leakage inductance to saturate the saturable reactor SL 1.
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