Inverter device

An inverter device comprising:

• a DC positive input line and a DC negative input line;
• a main bridge which includes a pair of series-connected switching elements provided with diodes connected in reverse parallel with the switching elements respectively;
• an auxiliary bridge which includes a pair of series-connected switching elements provided with diodes connected in reverse parallel with the switching elements respectively;
• a current-limiting reactor;
• and
• a control configured to PWM-control an on-off operation of each switching element constituting the main bridge,
• wherein a plurality of sets each one of which includes the main bridge and the auxiliary bridge is connected between the DC positive and negative input lines, said each set constituting a phase;
• the current-limiting reactor is connected between a common connection point of both switching elements of the main bridge and a common connection point of both switching elements of the auxiliary bridge in each set;
• and
• the current-limiting reactor has inductance with a time constant set at a value such that the time constant is not more than an on/off period of the switching elements of the main bridge.