| 主权项 |
1. A power supply system comprising:
a switching power supply configured to convert an alternating current voltage from an alternating current power supply into a predetermined direct current voltage and to output the direct current voltage; a switching unit, which is provided between the alternating current power supply and the switching power supply, and which is configured to switch a connection state between the alternating current power supply and the switching power supply; a control device; an electricity storage unit configured to feed power to the control device in a case where the switching power supply is at a stop; an auxiliary power supply circuit, which is connected in parallel with the switching power supply with respect to the alternating current power supply, and which is configured to feed charging current to the electricity storage unit; a driving circuit configured to drive the switching unit in response to an instruction output from the control device; and a voltage detection circuit configured to detect a voltage of the alternating current power supply, wherein the control device is configured to perform:
an overvoltage detection process of, when starting up the switching power supply, determining whether the alternating current power supply is an overvoltage based on a detection value of the voltage detection circuit; anda process of, in a case where an overvoltage is detected in the overvoltage detection process, keeping the switching unit at a cutoff state where the alternating current power supply and the switching power supply are disconnected. |
