多路Buck变换器并联均流技术的特性分析

Technical characteristics of multi-channel Buck converter parallel current sharing technology

为提高并联DC/DC变换器的稳定性,研究了多路Buck变换器并联均流的动态响应.首先,搭建了一个单个Buck变换器的双闭环控制系统,并通过负载扰动验证了该系统具有抗干扰性能.其次,利用状态空间平均法推导出了主从均流控制下的并联Buck变换器模型,并通过Simulink仿真验证了两路、三路并联Buck变换器系统均流效果的稳定性.最后,利用仿真实验显示基于主从均流法的多路Buck变换器不仅可以实现低压大电流的供电,而且还可以实现电流在各模块中自动均衡.因此,本文研究验证了主从均流控制对多路并联Buck变换器的可行性.

In order to improve the stability of parallel DC/DC converters,the dynamic response of parallel current sharing of multiple Buck converters is studied.First,a double closed-loop control system of a single Buck converter is built,and the anti-jamming performance of the system is verified by load disturbance;secondly,the parallel Buck converter model under the master-slave current sharing control is derived by using the state space averaging method.Simulink simulation verifies the stability of the current sharing effect of the two-way and three-way parallel Buck converter system.Finally,the simulation experiment shows that the multi-channel Buck converter based on the master-slave current sharing method can not only realize the power supply of low voltage and high current,but also realize the automatic current balance among the modules.Therefore,the research in this paper verifies the feasibility of master-slave current sharing control for multipath parallel Buck converters.