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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,...
Three-level AC switch unit is produced by two-level AC switch unit connected together in series manner. Basic three-level converter is produced by applying three-level AC switch unit in basic converter. Combination mode three-level converter is obtained by combining two basic three-level converters, and it is improved into combination mode three-level converter with input and output sharing the same...
Zeta mode three-level AC/AC converter can realize three-level voltage before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation and low or middle frequency isolation AC/DC/AC converters, it is single stage. And compared with Buck non-isolation AC/AC converter which can only realize buck output voltage, it can realize buck and boost output voltage...
A circuit topology of the push-pull three-level AC/AC converter with high frequency link is firstly proposed. The circuit topology of this converter is constituted of multilevel converter, high frequency transformer, output cyclic converter. The three-level push-pull AC/AC converter have the advantages such as simple topology, two stage power conversions, bidirectional power flow , high frequency...
At present, the primary methods of realizing AC/AC voltage transformation are frequency transformer, AC-DC-AC converter, matrix converter, high-frequency link AC/AC converters and single-stage AC/AC converters. In areas of high power conversion, taking into account to converter's cost and the quality of output voltage, bridge mode AC/AC converter has some advantages. This converter can realize electrical...
Novel AC/AC converters with high frequency ac link are composed of two kinds of AC/AC converters, which are voltage mode based on Forward converter and current mode based on Flyback converter. The circuit configuration and topology, control strategy, principle characteristics, design criteria of the key circuit parameters, and principle prototype of two-kinds converters are deeply and comparatively...
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...
A circuit topology of the forward-mode three-level AC/AC converter is proposed. The kind of circuit topologies are constituted of multilevel converter, high frequency transformer, output cycloconverter, and output filters. The converter has the advantages such as concise circuit structure, two-stage power conversions, bidirectional power flow, high frequency electrical isolation, three-level voltage...
A novel circuit topologies family of the current mode AC/AC converter with high frequency ac link, based on flyback converter, are proposed. These circuit topologies which can transfer one unregulated sinusoidal voltage with high THD into another regulated constant frequency sinusoidal voltage with low THD, are constituted of input cycloconverter, high frequency storage transformer and output cycloconverter...
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