DC-DC开关电源的建模与控制设计

Modeling and design of DC-DC switching power supply

非线性DC-DC开关电源的建模是设计其闭环控制系统的关键,对于保持系统输出电压的稳定和良好的动态响应特性具有非常重要的影响。选取了状态空间平均法作为建模方法,获取了系统的状态空间表达式及传递函数,在此基础上设计了电流内环、电压外环的双闭环反馈系统,并通过在Matlab软件中搭建系统的仿真电路进行仿真,通过仿真曲线验证了模型设计的正确性及双闭环的作用。该方法可用于指导其它DC-DC型开关电源的建模及闭环控制设计。

The model building of non-linear DC-DC switch power supply was the key to the closed-loop control of system. The maintaining of the output voltage and perfect dynamic characteristic of the system was greatly influenced. The average state-space method was chosen as a way. The state space system matrix and transfer function were got. The double closed-loop with inner current loop and external voltage loop were also designed based on it. At last, the model was simulated using the simulating circuit in Matlab software. Both the model and the double closed-loop design were verified by the simulation result of the curve. The design of the model building and closed-loop control for other types of DC-DC switch power supply could also be conducted by the method.