基于滑模变结构控制的Buck变换器研究

Research on Buck Converter Based on Sliding Mode Variable Structure Control

文中采用滑模变结构理论对Buck进行控制,探讨了滑模电压控制Buck变换器的状态空间数学模型;分析了切换函数的建立和存在条件,在PSIM环境下,设计了控制器实现电路。仿真实验结果验证了滑模切换函数的正确性,采用滑模控制的Buck变换器具有控制精度高、动态响应快,且系统对负载变化具有很强的鲁棒性。

The Buck converter controlled by sliding mode variable structure is introduced in this paper. The state-space mathematic model of voltage control of sliding mode is established; then the sliding mode function and the existence condi tion are analyzed finally the controller is designed in the PSIM environment. The simulation experiment results demonstrate that the Buck converter has high control accuracy, fast dynamic response and strong robustness to the load change.