| 摘要 |
PROBLEM TO BE SOLVED: To prevent a failure due to power supply stop from occurring by allowing a load device to operate appropriately before stopping power supply from an auxiliary power supply source.SOLUTION: A power supply device has: detection means 17 for detecting presence of a power failure from an output voltage of a main power supply source AC; transmission means 19 for transmitting power failure information to a load device 100 through power supply lines 11 and 12 when the detection means detects the power failure of the main power supply source; power supply monitoring means 21 for monitoring remaining power amount of an auxiliary power supply source; at least one power supply switch 23 for turning on/off the power supplied to the load device through the power supply lines; and control means 25 for controlling so that the transmission means may transmit power supply stop pre-notice information to the load device when the power supply monitoring means detects that the remaining power amount of the auxiliary power supply source drops and the power supply switch may be turned off after a predetermined time elapses. |
