| abstract |
In a switching device that switches input power and outputs, a power switching device for preventing a problem that power is not supplied to a load from either a commercial power source or an assembled battery at the time of a power failure or failure of a control unit, and To provide a power supply system using this. A commercial power source 1 and an inverter 5 are connected to a switch 6 that outputs the commercial power source 1 and the inverter 5 by connecting them in parallel via switching elements 13a, 13b, 13c, and 13d, respectively. Connect through. Normally, the switch 7 is open, and the power of either the commercial power source 1 or the inverter 6 is output from the switch 6 to the output terminal 2. However, the switch 6 is turned off due to a power failure or failure of the control unit in the switch 6. When power cannot be output, the commercial power source 1 is connected to the output terminal 2 by closing the switch 7. [Selection] Figure 1 |