Abstract：In the renewable power system with two or more sources, the application of multiple-input converter instead of several single-input converters can simplify the circuit and reduce the cost. This paper derives the voltage conversion of the double-input Buck converter, and concludes that it is dependent on the duty cycles of the two switches, and has nothing to do with the phase difference between the drive signals for the two switches. This paper discusses the relationship between the inductor current ripple and phase difference of the two drive signals, and based on which, an interleaved dual-edge modulation scheme is employed in order to minimize the inductor current ripple. As a result, the filter inductor can be reduced significantly, leading to a fast dynamic response and a high power density. A 400W prototype is fabricated in the lab to verify the theoretical analysis and the effectiveness of the proposed interleaved dual-edge modulation scheme.
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2009, Vol. 24 
