Abstract—This
paper proposes a pulse-width modulation threelevel converter with reduced
filter size using two transformers. The proposed converter hasmany advantages.
All switches sustain only the half of the input voltage and since the secondary
rectified voltage is a three-level waveform, the output filter inductor can be reduced.
Also, because of the power sharing of transformer and reduced output inductor,
high efficiency can be obtained. The operational principle, analysis, and
design considerations of the proposed converter are presented in this paper.
The validity of this study is confirmed by the experimental results from a
prototype with 600W, 500–600V input, and 60V output.
(Index
Terms—Reduced filter size, three-level converter.)
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