| 摘要 |
PROBLEM TO BE SOLVED: To provide an offset voltage generator controlling continuous modulation and discontinuous modulation of a three-phase inverter.SOLUTION: An offset voltage generator of a three-phase inverter includes: a first limiter configured to compare a first phase-voltage signal with a maximum limit value and a minimum limit value to output a first limit-voltage signal; a second limiter configured to compare a second phase-voltage signal with the maximum limit value and the minimum limit value to output a second limit-voltage signal; a third limiter configured to compare a third phase-voltage signal with the maximum limit value and the minimum limit value to output a third limit-voltage signal; and a summer configured to add a difference value between the first phase-voltage signal and the first limit-voltage signal, a difference value between the second phase-voltage signal and the second limit-voltage signal, and a difference value between the third phase-voltage signal and the third limit-voltage signal, to output an offset voltage. The maximum limit value and the minimum limit value are determined by a predetermined weighted value and a DC end voltage of the three-phase inverter.SELECTED DRAWING: Figure 5 |
