| 摘要 |
A multi-output switching power supply device is provided with voltage generating circuits (Q1, Q2, T1a, 10a) which generate a pulse voltage by disconnecting a direct current power supply (1); a serial resonance circuit, which has a current resonance capacitor (Cri2), a primary winding (P2) of a transformer (T2) and a switching element (Q3) and has a pulse voltage generated by the voltage generating circuit applied thereon; rectifying smoothing circuits (D2, C2) which rectify and smooth a voltage generated at a secondary wiring (S2) of the transformer and take out a direct current output voltage; and a control circuit (11) which turns on and off a switching element based on the direct current output voltage.
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