| 摘要 |
PROBLEM TO BE SOLVED: To obtain a DC voltage with high precision without having to use a complex circuit configuration by a method, wherein the DC voltage is obtained by utilizing the input/output and voltage/current of a power converter and a control value which controls the power converter. SOLUTION: A primary voltage Vac of a transformer 2 is detected, power P flowing into an AC motor 4 is calculated, and a DC voltage Vdc of the power converter is calculated from the primary voltage Vac of the transformer 2 and the power P flowing into the AC motor 4. |
