Analysis and applications of a current-sourced buck converter

In many power converter applications it is required that the topology have a current-sourced input. If a voltage step down is needed, then the choice of converter topologies is limited, or requires several stages. This paper presents a known, but rarely utilized, buck-type converter that has a current-sourced input. Analyses of the large-and small-signal models of the converter are presented with and without the use of coupled inductors. Through simulation and experimental results, the converter is shown to be a viable option for current-source applications such as active power-factor correction.

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