Abstract: An electric power supplying system includes a plurality of AC output converters connected in parallel to a bus configured to supply power to an AC load. Each of the AC output converters includes: an AC-DC converter; a DC-AC converter; a secondary battery connected in parallel to the DC-AC converter; a first switching circuit provided between the bus and the DC-AC converter; a bypass path, a second switching circuit provided between the bus and the bypass path; a switching control circuit configured to control the first and second switching circuits at the time of power failure and power restoration; and a control power supply circuit configured to receive a supply of the external AC voltage, the AC voltage converted by the DC-AC converter, a bypass voltage of the bypass path, and a voltage of the bus, to generate a control voltage for the switching control circuit.

Abstract: An electric power supplying system includes a plurality of AC output converters connected in parallel to a bus configured to supply power to an AC load. Each of the AC output converters includes: an AC-DC converter; a DC-AC converter; a secondary battery connected in parallel to the DC-AC converter; a first switching circuit provided between the bus and the DC-AC converter; a bypass path, a second switching circuit provided between the bus and the bypass path; a switching control circuit configured to control the first and second switching circuits at the time of power failure and power restoration; and a control power supply circuit configured to receive a supply of the external AC voltage, the AC voltage converted by the DC-AC converter, a bypass voltage of the bypass path, and a voltage of the bus, to generate a control voltage for the switching control circuit.