基于等效控制的全局滑模控制Buck变换器设计

Design of Global Sliding-Mode Controlled Buck Converters Based on Equivalent Control

为简化滑模控制器设计和提高变换器系统的鲁棒性,探讨了全局滑模控制的原理和设计方法,并用于设计Buck变换器的控制系统.分析了全局滑模控制Buck变换器的特点,给出了基于等效控制思想的全局滑模控制器设计步骤,并设计了全局滑模控制律.最后,通过仿真分析,探讨了全局滑模控制器应用于Buck变换器的可行性和有效性.仿真结果表明,设计的全局滑模控制Buck变换器较传统滑模控制Buck变换器的瞬态响应速度快,并具有全局鲁棒性.

To simplify the design of sliding-mode controller and improve the robustness of converter systems, the principle and design method of global sliding-mode control were investigated and introduced to the controller design for Buck converters. The main characteristics of Buck converters with global sliding-mode control were analyzed, the design procedure of global sliding-mode controller was given based on the equivalent control idea, and global sliding-mode control law was designed. Finally, a simulation was carried out to explore the feasibility and validity of applying the global sliding-mode controller to Buck converters. The simulation results show that a Buck converter with the global sliding-mode controller has a high transient response velocity than a Buck converter with the conventional sliding-mode controller, and the former possesses global robustness throughout the transient process.