| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize smaller size and lower cost of a device by decreasing fluctuation width of an output voltage.SOLUTION: A power source device includes a transformer T701 including a primary winding Np and a plurality of secondary windings Ns1, Ns2, a main switching element Q701 for switching a current flowing the primary winding Np of the transformer T701, an operational amplifier IC 703 which feeds back a return current corresponding to a detection voltage according to an output voltage of the secondary winding of the transformer T701 to a primary side of the transformer T701, and a power source IC701 which controls output voltages of the secondary windings Ns1, Ns2 of the transformer T701 by controlling operation of the main switching element Q701 according to the return current. The operational amplifier IC 703 feeds back a current according to the detection voltage corresponding to the output voltages of the plurality of secondary windings Ns1, Ns2 at the time of equipment operation, and at the time of equipment standby, feeds back a current according to the detection voltage corresponding to the output voltage of the secondary winding Ns2.</p> |
