| 摘要 |
A power transforming apparatus and a power transforming method wherein even in a case of a narrow PWM pulse, the distortions of the output voltage and output current can be reduced and wherein the calculating operation is simple, the cost is low and a high performance can be achieved. The power transforming apparatus, which uses bilateral switches to connect the phases of an AC power supply with the phases of an output side and which performs PWM control of the AC power supply voltages, has a single-phase-fixed switching mode and a all-phase switching mode and includes a mode switching part for switching from the all-phase switching mode to the single-phase-fixed switching mode. There are also included a vector component calculator (13) for selecting, from a hexagonal spatial vector diagram, a voltage vector, which is the same as an instantaneous voltage vector, to calculate the vector component of the instantaneous voltage vector; and a time calculator (14) for calculating the output time of the vector component.
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