Patent ID: 8787055
Filing Date: 2014-07-22
Classification: H02M,Y02B

Abstract:
1. 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.