Abstract
The invention includes an autotransformer for converting three-phase AC power to nine-phase AC power. The autotransformer includes three coils, each coil including a plurality of serial windings that together form a polygon. Nine output nodes are provided between adjacent winding pairs, the windings sized and arranged such that adjacent output voltages are separated by 40 degree phase shift and such that output voltage magnitudes are essentially identical. Both step-down and unity gain input node sets are provided wherein, when three-phase AC supply lines are linked to the step-down input set the output voltage is stepped down and when the three-phase AC supply lines are linked to the unity gain input set the transformer gain is unity. The invention also includes an isolation transformer having characteristics similar to those of the autotransformer.
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