| 摘要 |
<p>A three-phase inverter (10) is provided with a switching unit (1) in which three legs are connected in a three-phase bridge, and an auxiliary circuit (23) composed of a single leg. A pseudo-impedance (21, 22) is connected to the auxiliary circuit (23). A first control unit (1) changes a switching pattern which has been temporarily set so that a zero-vector interval (t1), in which all upper arms of the switching unit (1) are on in a single cycle, and a zero-vector interval (t7), in which all lower arms are on, are the same length so as to offset the switching pattern of a first phase having the longest on-interval or a second phase having the shortest on-interval to eliminate the zero-vector interval and control the switching operation of the switching unit (1). The second control unit (24) controls the switching operation of the auxiliary circuit (23) so as to be the reverse of the third-phase switching operation of the switching unit (1).</p> |
