【摘要】 在多种新能源联合供电系统中,采用多输入直流变换器代替多个单输入直流变换器,能够简化电路结构,降低系统成本。首先分析了双输入Buck变换器的输入输出关系,它只决定于两只开关管的占空比,而与驱动信号的相位无关。然后分析了两只开关管的驱动信号之间的相位差与电感电流纹波的关系,采用交错双沿调制方法,使得电感电流纹波最小,由此可以提高变换器的动态响应速度和功率密度。搭建了一个400W的原理样机,实验结果验证了交错双沿调制方法的有效性。更多还原

【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.更多还原