| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power supply device in which, even if a short-circuit abnormality occurs at the side of a DC regulator being operated, the DC regulator can be promptly exchanged with a DC regulator being on hot-standby.SOLUTION: The DC power supply device comprises: a first DC regulator 20 by which an input DC voltage supplied from an input-side power supply circuit 10 to an input terminal is converted into a first predetermined voltage and outputted; a second DC regulator 30 which is connected in parallel with the first DC regulator and by which an input DC voltage is converted into a second predetermined voltage that is different from the first predetermined voltage, and outputted; and diodes D1 and D2 which are connected to output terminals of the DC regulators 20 and 30 in a forward direction and of which the cathodes are connected to a common output terminal. The DC power supply device is configured to output the DC voltage from the second DC regulator 30 if operation of the first DC regulator 20 is stopped. Between an input terminal Ti and each of the DC regulators 20 and 30, short-circuit protection circuits 40 and 50 are provided for disconnecting a corresponding feeder line if a short-circuiting state is detected.SELECTED DRAWING: Figure 1 |
