Abstract
This article presents a switched-capacitor (SC) bidirectional voltage buck-boost converter for implementing dc-ac and ac-dc power conversion. The SC converter employs a SiC switched-capacitor circuit augmented with the main Si converter circuit to the power source. It is thus providing unique features that cannot be attained by the traditional voltage-source inverter (VSI) or boost VSI. The additional features include doubling the area of the linear modulation region, eliminating both the large inductor in the boost de-de stage and the large filtering capacitor. The SiC leg operate at a switching frequency higher than the switching frequency of the Si inverter legs. Thus high efficiency can be attained with maintaining the charging current of the switched-capacitor under control. To describe the operating principle, we focus on one example: a bidirectional SC converter for dc-ac and ac-dc power conversion in electric and hybrid electric vehicles.
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