Buck变换器滑模控制的研究与实现

Research and realization of sliding model control for Buck converter

研究滑模变结构控制策略在Buck变换器中的应用,提出基于PWM技术的滑模控制器,解决Buck变换器滑模变结构控制性能受元器件开关速度影响的问题;设计控制器实现电路,研制实验样机,并进行实验。实验结果表明采用本文提出的方法控制Buck变换器,控制精度高,动态响应快,且系统对输入电压波动和负载变化等干扰具有很强的鲁棒性。

The application of sliding mode variable structure control was studied for Buck converter and a novel PWM-based sliding mode controller was designed to resolve the problem that the performance of Buck converter controlled by sliding mode controller was impacted by the switching frequency of components. An experimental prototype was developed, and the experiment results indicate that Buck converter controlled by the proposed method has high accuracy, speedy dynamic response and strong robustness against the interferences such as fluctuations of input voltage and variations of load disturbances.