... star-connected autotransformer in the 12-pulse rectifier to be applied in step-down circumstances rather than situations of harmonic reduction only. At the same time, this paper provides a way that can be used to redesign the autotransformer in other multi-pulse rectifier systems, so that those...

... amplitude and output voltage amplitude. And the larger the K_T, the stronger step-down ability of the autotransformer. From Figure 1 , under large inductive load, the output currents can be calculated as: 12-pulse rectifier with zigzag autotransformer is shown in Figure 1...