Abstract: There is provided a device including: an inverter 5 including switching elements 51-52 for outputting a U-phase voltage and switching elements 53-54 for outputting a W-phase voltage; midpoint capacitors 31-32; a midpoint stabilizer 2 configured to regulate a power storage amount of each of the midpoint capacitor 31 and the midpoint capacitor 32; and a controller 7 configured to control the switching elements 51-54 so as to supply a desired U-phase voltage and a desired W-phase voltage based on voltages between the U-phase voltage line and the neutral line and the voltage between the W-phase voltage line and the neutral line, and control the midpoint stabilizer 2 so as to adjust the midpoint potential in the O phase based on the condition of the midpoint potential in an O phase at a connecting point between the midpoint capacitor 31 and the midpoint capacitor 32.

Abstract: A power supply control system includes power supply switch devices each including main relays, sub relays, and control units and a control line connected to sub control lines for controlling the sub relays. The control units control the sub relays of other power supply switch devices via the control line.

Abstract: There is provided a device including: an inverter 5 including switching elements 51 52 for outputting a U-phase voltage and switching elements 53 54 for outputting a W-phase voltage; midpoint capacitors 31 32; a midpoint stabilizer 2 configured to regulate a power storage amount of each of the midpoint capacitor 31 and the midpoint capacitor 32; and a controller 7 configured to control the switching elements 51, 54 so as to supply a desired U-phase voltage and a desired W-phase voltage based on voltages between the U-phase voltage line and the neutral line and the voltage between the W-phase voltage line and the neutral line, and control the midpoint stabilizer 2 so as to adjust the midpoint potential in the O phase based on the condition of the midpoint potential in an O phase at a connecting point between the midpoint capacitor 31 and the midpoint capacitor 32.

Abstract: A power supply control system includes power supply switch devices each including main relays, sub relays, and control units and a control line connected to sub control lines for controlling the sub relays. The control units control the sub relays of other power supply switch devices via the control line.