Electranix Corporation

DC-to-DC Capacitor-Based Power Transformation

This paper explores the prospects of capacitor-based transformation of power from one voltage level to another without an intermediate magnetically-based transformer. It considers the advantages and limitations of capacitive circuits widely used for that purpose at the electronics level, but also seeks to take advantage of the capabilities inherent in power-level thyrsitors and IGBT’s within the bridge architecture of commonly used MMCs. The paper cites the criteria by which various capacitor-based schemes can be judged as well as means by which relatively smooth dc output and input wave-forms can be achieved within the limitations of what is basically a pulse-based energy transfer mechanism.

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