| 摘要 |
A power conversion apparatus is formed by connecting unit communication-assisting means (8, 15, 22) in series between an alternating-current terminal (7, 14, 21) incorporated in a conventional current-type power conversion apparatus, and an alternating-current load 29. The communication-assisting means includes reverse-blocking-type self-commutated devices (9, 10, 16, 17, 23, 24) and a capacitor (11, 18, 25). By controlling the switching of the reverse-blocking-type self-commutated devices (9, 10, 16, 17, 23, 24), a voltage is generated at the capacitor (11, 18, 25) and additionally used for a power supply commutation operation or load commutation operation. By virtue of this structure, the power conversion apparatus can easily provide a large capacity (high voltage, large current), and can be improved in power factor. Further, the structure enables the number of required fundamental elements to be reduced, and hence enables the power conversion apparatus to be produced easily at low cost. |
