| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a small-sized power supply unit capable of varying output voltages over a wide voltage range. <P>SOLUTION: The power supply unit 1 includes a high-frequency transformer 14 having a primary winding 14a and a plurality of secondary windings 14b, 14c; a converter 11 which is provided on the primary side of the high-frequency transformer 14 and which converts AC power supplied from a commercial AC power supply PS to DC power; a power conversion circuit 12 which is connected to the primary winding 14a of the high-frequency transformer 14 and the converter 11 and which implements conversion between DC power and AC power; a switch 15 for switching a connection relationship between the plurality of secondary windings 14a, 14b provided in the high-frequency transformer 14; and a power conversion circuit 16 which is connected to the secondary windings 14b, 14c of the high-frequency transformer 14 through the switch 15 and which implements conversion between DC power and AC power. <P>COPYRIGHT: (C)2012,JPO&INPIT |
