Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/243875 
Year of Publication: 
2020
Citation: 
[Journal:] Energy Reports [ISSN:] 2352-4847 [Volume:] 6 [Issue:] 2 [Publisher:] Elsevier [Place:] Amsterdam [Year:] 2020 [Pages:] 173-178
Publisher: 
Elsevier, Amsterdam
Abstract: 
In this paper, we present an inductor-less direct ac-ac converter with improved nesting-type topology. Unlike existing direct ac-ac converters, the proposed ac-ac converter combines a voltage equalizer and a switched-capacitor (SC) simple converter. Owing to the nesting conversion using two techniques, the proposed converter can provide a stepped-down voltage with small number of circuit components and high input power factor. To evaluate the performance of the proposed ac-ac converter, we compared the proposed ac-ac converter with existing inductor-less ac-ac converters, namely, flying capacitor type converter, symmetrical type converter, and traditional nesting-type converter, by theoretical analysis and simulation program with integrated circuit emphasis (SPICE) simulations. The SPICE simulations demonstrate that the proposed ac-ac converter outperforms existing inductor-less ac-ac converters in the point of circuit size and input power factor, although the power efficiency of the proposed ac-ac converter is inferior to that of the symmetrical type converter. In the case of 1/4× voltage gain, the proposed ac-ac converter achieves about 82% power efficiency and 0.58 input power factor when the output power is 200 W.
Subjects: 
Inductor-less ac-ac converter
Nesting-type inverter
Step-down converter
Switched-capacitor circuits
Voltage equalizers
Persistent Identifier of the first edition: 
Creative Commons License: 
cc-by-nc-nd Logo
Document Type: 
Article
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