| 摘要 |
A three-level PWM converter (3) includes first to third fuses (F1R to F3R) having one terminals connected to a DC positive bus (13), a DC negative bus (14) and a DC neutral point bus (15), respectively, first and second IGBT elements (Q1R, Q2R) connected between respective ones of the other terminals of the first and second fuses (F1R, F2R) and an AC line (RL), an AC switch (Q3R, Q4R, D3R, D4R) connected between the AC line (RL) and the other terminal of the third fuse (F3R), first and second diodes (D1R, D2R) connected in anti-parallel to the first and second IGBT elements (Q1R, Q2R) respectively, a first capacitor (C1R) connected between the other terminals of the first and third fuses (F1R, F3R), and a second capacitor (C2R) connected between the other terminals of the second and third fuses (F2R, F3R).
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