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This paper studies the effect of interleaving operation on the bifurcation behaviour in a system of parallel-connected DC/DC buck converters. Simulations and analysis are presented for both the cases of interleaving operation and synchronous operation. It is found that variation of the voltage feedback gains leads to period-doubling bifurcation. Interleaving operation will discourage the occurrence of this bifurcation by widening the stable region. Also, variation of output capacitance, load or switching period leads to Neimark-Sacker bifurcation. Interleaving operation will make this bifurcation more likely to occur by narrowing the stable region. Bifurcation boundaries of stable period-1 operation in the two cases are located and compared.