| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply device where power level fluctuation by discharge of a charge remaining in a capacitor of a noise filter is prevented. <P>SOLUTION: The device is provided with insulation-type OBP 120 converting voltage from a DC power supply E into prescribed voltage and supplying it to a load 130, a noise filter formed of common choke coils L1 and L2, which are connected in series to a negative power supply line and a CG line, which transmit voltage from the DC power supply E to OBP 120, on a primary side of OBP120, and of one or more capacitors C3 to C9 connected between the negative power supply line and the CG line, and switches SW1 and SW2, which are connected between the negative power supply line and the CG line in parallel to the capacitors C3 to C9, and which are opened when a part between OBP120 and the DC power supply E is a conduction state and is shorted when it is in a non-conduction state. <P>COPYRIGHT: (C)2007,JPO&INPIT |
