| 摘要 |
PROBLEM TO BE SOLVED: To make available a long-time operation with low output by suppressing ground current and noise during a low output operation, in the case that a multiple switching method is used. SOLUTION: This inverter is constituted of an inverter main circuit 2, having an inverter section 7 constituted of a plurality of switching elements and an inverter control circuit 3 which controls the inverter main circuit 2, by a multiple switching method. The inverter control circuit 3 conducts phase control on a sinusoidal waveform as a reference for a current command. When the output voltage of a DC power supply is smaller than a specified threshold value, a power factor is set to a value less than 1, proportional to the magnitude of the output power. In other cases, the power factor is maintained at 1, regardless of the magnitude of the output power. |
