| 摘要 |
A switching power supply includes a noise filter; a bridge rectifying circuit; a smoothing capacitor; a primary winding of a transformer and a switching element; and a control circuit for controlling the switching element. Further, the first reactor and the first diode are connected sequentially in series between one output terminal of the bridge rectifying circuit and one terminal of the smoothing capacitor. The second reactor and the second diode are connected in series between a node that mutually connects the first reactor and the first diode and a node that mutually connects the primary winding and the switching element.
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