一种新型的开关电源并联供电技术的研究

摘要

It is prone to appear the phenomenon of uneven distribution of their load currents when several switching power supply modules are connected in parallel.In order to overcome the low efficiency of switching power supply when the supply to the load is in low voltage,a high efficiency power supply method with switching power supplies connected in parallel is introduced,in which each power supply module has voltage and current feedback control,and synchronous rectification is used to allocate the load currents at a set ratio and deliver power supply with high efficiency even at low voltage output.This paper presents the design scheme of the system.This power supply method is verified by a parallel system composed of two BUCK circuit modules.The results of the experiment show when power supply is at low voltage,the system keeps on its high efficiency and good allocation of load currents.%针对多个开关电源并联时易出现各个模块的负载电流分配不均的现象,同时为了克服在低电压输出供电给负载时开关电源效率降低的问题,提出了一种高效率的开关电源并联供电方法,各个电源模块采用电压电流反馈控制,并应用同步整流技术,以实现按设定比例分配电流和在输出低压时仍能高效供电的目的.基于此给出了系统的设计方案,用两个BUCK电路模块构成的并联系统验证了这种供电方法,实验的结果数据表明,系统的低压供电效率高,电流分配效果良好.