| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a switching power-supply device that allows achieving low voltage input, large power output, high efficiency, and low noise.SOLUTION: A power-supply device 100 includes: a terminal V1; a terminal V2; a first winding L1 connected to the terminal V1; a second winding L2 connected in series to the first winding L1 and magnetically coupled to the first winding L1; a capacitor C connected in series to the second winding L2; a transformer T having a primary winding TL1 connected in series to the capacitor C and the terminal V2 and a secondary winding TL2 magnetically coupled to the primary winding TL1; a rectifier smoothing circuit connected to the secondary winding TL2; a switching element Q1 connected between a connection point of the first winding L1 and the second winding L2 and the terminal V2; and a control circuit 10 controlling on and off of the switching element Q1.</p> |
