| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power supply capable of easily simulating a blackout state, without a complicated operation such as pulling out an AC plug from a receptacle.SOLUTION: A DC power supply 100 includes: an AC/DC converter 10 which converts AC power, supplied from commercial power AC1, into DC power to output; and a blackout advance notice circuit 30 which outputs a blackout advance notice signal on detecting the blackout of the commercial power before the output voltage of the AC/DC converter decreases. The DC power supply 100 further includes: a blackout state generation switch S1 which forcibly causes the blackout advance notice circuit to output the blackout advance notice signal during the non-blackout of the commercial power; and a switch circuit 40 which, on the accompaniment of the operation of the simulated blackout generation switch, cuts off an output side feeder line of the AC/DC converter 10, after the lapse of a predetermined time after the output of the blackout advance notice signal from the blackout advance notice circuit 30.SELECTED DRAWING: Figure 1 |
