| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conversion device capable of performing a fail-safe operation with certainty.SOLUTION: When detecting that short circuit failures occur at a switching element TV1 in use of a power conversion device 10, a control device 50 turns off all switching elements of a 3-phase 3-level inverter. Thereafter, as shown in Fig. 2, the control device 50 turns off a third switching element TV3 of a V-phase 3-level inverter circuit part at which short circuit failures occur, and turns on a second switching element TV2 and a fourth switching element TV4. During that, the control device 50 makes first to fourth switching elements TU1-TU4 and TW1-TW4 of U-phase and W-phase 3-level inverter circuit parts at which short circuit failures do not occur be in an off state. Thereby, a wire between the first switching element TV1 and an output point OV are fused. |
