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The capacitor-clamped base cell is presented. Based on the base cell, a novel family of single-stage three-level (TL) ac choppers is proposed. The converters can directly transfer unsteady high ac voltage with distortion into regulated sinusoidal voltage with low THD. The circuit configuration is constituted of a TL converter, and input and output filters. The topological family includes buck, boost,...
A Zeta mode three-level AC/AC converter is proposed, the converter is available in high input voltages as well as in high power applications, and it also intended for use in applications where a sinusoidal output voltage of high quality is needed. It realizes the three-level voltage waveforms before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation...
A novel circuit topology of buck-boost three-level single-stage AC/AC converter is proposed in this paper. The voltage stress of power switches of this converter is half of that of two-level converter. The transient voltage feedback control strategy of the converter is investigated. According to the polarity of the output voltage and the output current, the converter contains four kinds of operation...
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