| 摘要 |
PROBLEM TO BE SOLVED: To reduce the dimensions and the number of resonance capacitors in a partial resonance inverter device that causes resonance to occur at the time of switching, by providing a resonance reactor and resonance capacitor for each phase. SOLUTION: A resonance circuit part 8 is structured by providing each series circuit made up of a resonance reactor 9a (9b or 9c) and an auxiliary switch 11a (11b or 11c) between the connection points of voltage dividing capacitors 6, 7 connected parallel to a DC power source 1 and those of upper and lower arms of each phase, and by connecting a resonance capacitor 10a (10b or 10c) parallel to the series circuit of each phase. This structure enables the resonance capacitor of each phase to be used commonly for the upper and bottom arms, which makes it possible to reduce the dimensions and the number of the resonance capacitors. |
