Abstract
This paper presents a bidirectional non-isolated dc-dc converter based on switched-capacitor converters intended for its applications to electric railway systems. It consists of plural main converters with two power devices per each converter, plural auxiliary converters each of which is formed by cascaded chopper cells, and small-sized inductors for current control. The dc-dc converter can achieve zero-current switching (ZCS) of all power devices used in the main converters under arbitrary load conditions and arbitrary voltage ratio of high-voltage-side voltage and low-voltage-side voltage. Consequently, square-wave currents can be removed from both the high- and low-voltage sides of the converter. The validity of the operating principles as well as the control methods proposed in this paper are verified by experiments using a 200-V, 2-kW downscaled model.
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