| 摘要 |
A multi-level inverter apparatus comprises: first and second GTOs connected in series between a positive electrode of a D.C. power supply having a mid-potential point and an output terminal, and third and fourth GTOs connected in series between a negative electrode of the D.C. power supply and the output terminal. First and second reactors cooperate with the first and second GTOs and the third and fourth GTOs so as to form a positive and negative arms, respectively. A first diode is connected between one end of the first reactor and the mid-potential point of the D.C. power supply in forward direction with respect to the output terminal, while a second diode is connected between one end of the second reactor and the mid-potential point of the D.C. power supply in backward direction with respect to the output terminal. First to fourth series connections, each including a diode and a capacitor connected in series to each other, are connected in parallel with the first to fourth GTOs, respectively. First and second discharge resistors are associated with the first to fourth series connections to consume energy discharged from the capacitors.
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