一种BUCK变换器的抗扰动控制方法

摘要

In order to solve the problem of a variety of disturbances ( variations of input voltage and load changes, etc. ) existing in BUCK converter that exerts great influence on the output voltage, the disturbance rejection control method for BUCK converter is proposed. Firstly, the traditional PI controller is replaced by the variable parameter PI ( VAPI) controller for improving PI control method; then, the disturbance observer ( DOB) is designed to observe system disturbance caused by parameter perturbation or load changes, the observed information serves as the compensation to the feed - forward channel, thus the convergence speed and anti - disturbance capability are improved; finally, the effectiveness of the proposed algorithm is verified by simulation.%为解决降压变换器中存在多种扰动(如输入电压变化和负载变化等)严重影响输出电压的问题，提出了一种BUCK变换器的抗扰动控制方法。首先，采用变参数PI(VAPI)控制器代替传统PI控制器，作为改进的PI控制方法；然后，设计扰动观测器(DOB)观测参数摄动与负载变化带来的系统扰动，作为补偿量补偿到前馈通道，提高系统的收敛速度与抗扰动能力；最后，通过仿真验证了该算法的有效性。