Abstract
A switched-capacitor interleaved bidirectional dc–dc converter that combines a three-phase interleaved structure with switched-capacitor cells is proposed. The converter features a wide voltage-gain range, low-current ripple on the low-voltage side, low voltage stresses across power switches, an absolute common ground between input and output, and can be easily extended into a topology family. The operating principle and power switch voltage and current stresses are analyzed in detail. An 800 W prototype with a wide voltage-gain range ( U high = 400 V, U low = 30–100 V) is described, demonstrating a maximum efficiency of 95.8% in the step-up mode and 95.9% in the step-down mode.
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