| 摘要 |
A switching power supply circuit includes a converter transformer in which an output obtained by switching a direct current voltage of a converter through resonance is transmitted from the primary side to the secondary side. The switching power supply circuit further includes, on the secondary side of the converter transformer, a secondary step-up winding wound on a portion of a core together with a primary winding, and a low voltage secondary winding wound on another portion of the core. On the secondary side of the converter transformer, an alternating voltage obtained from the step-up winding is utilized to produce a direct current high voltage, and an alternating voltage obtained from the low voltage secondary winding is utilized to produce a direct current low voltage. Consequently, two different direct current outputs including the direct current high voltage and the direct current low voltage are obtained from the converter transformer, and therefore, miniaturization of the switching power supply circuit can be anticipated.
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