UNINTERRUPTIBLE POWER SUPPLY APPARATUS

An AC/DC converter converts an AC voltage supplied from an AC power supply into a first DC power supply voltage. A power supply line transmits the first DC power supply voltage to a plurality of power conversion modules and a bypass module. The bypass module includes a switch connected between the AC power supply and the load, and a first controller that operates upon receiving an operating power supply voltage based on the first DC power supply voltage to thereby control ON/OFF of the switch. Each power conversion module includes a power converter that converts power supplied from the AC power supply or a power storage device into AC power and supplies the AC power to the load, and a second controller that operates upon receiving an operating power supply voltage based on the first DC power supply voltage to thereby control the power converter.