ALTERNATING CURRENT POWER SUPPLY DEVICE AND METHOD OF CONTROLLING SAME

An alternating current power supply device (10) comprises a DC power supply (12) for generating direct current power, a plurality of, e.g., three first DC/AC inverter (16a) to third DC/AC inverter (16c) which are arranged in parallel and electrically connected to the DC power supply (12), for converting the direct current power generated by the DC power supply (12) into alternating current power and supplying the alternating current power to a load (14), and a control unit (18) for controlling the driving of the first DC/AC inverter (16a) to the third DC/AC inverter (16c). The capacitance A (1) of the first DC/AC inverter (16a) is set to W/6, the capacitance A (2) of the second DC/AC inverter (16b) is set to W/3, and the capacitance A (3) of the third DC/AC inverter (16c) is set to W/2.