| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply switching device which prevents operation of an electric apparatus from being stopped during power supply switching from a battery to a commercial power source with power recovery, while suppressing expansion in size and increase in component cost.SOLUTION: An output power switching section 14 switches between a first output state in which first AC power Wo1 supplied from a commercial power source 40 is outputted from an electric apparatus connection section 17 and a second output state in which second AC power Wo2 generated by an inverter 13 is outputted from the electric apparatus connection section 17. When a power failure of the commercial power source 40 is detected during the first output state, a power supply control section 10 switches to the second output state. When a state where the power failure of the commercial power source 40 is not detected is obtained thereafter, in the case where a detection level Ws of a power sensor 16 is equal to or higher than a determination level Wth, the power supply control section 10 switches to the first output state after the detection level Ws becomes lower than the determination level Wth. |
