Inverter apparatus

An inverter apparatus wherein a plurality of element sets each comprising a pair of switching elements connected to each other in series are connected in parallel to each other relative to a DC power source to form an inverter circuit which converts a DC voltage of said DC power source into pseudo AC voltages with a plurality of pulse row-like phases and outputs said pseudo AC voltages, an output control circuit including a PWM generator capable of adjusting each phase of said pseudo AC voltages by pulse modulation is connected to said inverter circuit, and output voltages from said inverter circuit are applied to a power supplied load, characterized in that an average voltage of respective phases of said output voltages applied to said power supplied load is detected as a virtual neutral voltage corresponding to a neutral voltage of said power supplied load by detecting a voltage at a common node where respective phases of a voltage detecting circuit provided between said inverter circuit and said power supplied load are connected, and by feeding back said detected virtual neutral voltage for controlling an output duty of each phase by said PWM generator, said output voltage of each phase from said inverter circuit is controlled so as to become a target output voltage.