| 摘要 |
PROBLEM TO BE SOLVED: To attain size, weight and cost reductions, and response, protection and reliability improvements in a device by reducing the electrostatic capacity of capacitors 12, 13 provided on the DC input side of a multi-level inverter circuit 14 and relieving the pulsation of the charging voltage. SOLUTION: In a power converter having the multi-level inverter circuit 14, as a DC power supply connected to constitute a DC circuit on the DC input terminal side of the multi-level inverter circuit 14, at least DC power supplies 15, 16 having a two-way power supply function respectively are provided each between the midpoint of the DC circuit and positive and negative input terminals, thus relieving the pulsation of positive and negative DC voltages relative to midpoint potential. The midpoint potential is grounded through an impedance element 17. |
