基于非奇异终端滑模技术的DC-DC Buck 变换器研究

针对DC-DC Buck变换器所需的稳定性及快速性,设计出一种恒频非奇异终端滑模控制器。对比平均电流技术,该控制器能避免设计系统补偿器,并能解决传统滑模技术控制中存在工作频率不固定、响应速度较慢的难题。通过设定S函数作为切换面,以双曲正切函数作为控制律进行仿真及实验验证,结果表明,在输入电压和负载电流发生变化时,运用非奇异终端滑模技术对DC-DC Buck变换器控制的输出电压超调量远小于运用平均电流技术的,且响应速度大大提高。

Research on DC-DC Buck Converter Based on Nonsingular Terminal Sliding Mode Technology

In view of the required stability and rapidity of DC-DC buck converter, an improved design has been proposed of the constant frequency nonsingular terminal sliding mode controller. Compared with the average current technology, the controller can avoid the design of system compensator, thus solving the problems of unstable working frequency and slow response in traditional sliding mode control. By setting S-function as the switching surface and hyperbolic tangent function as the control law, the simulation and experimental results show that, with the changes of the input voltage and load current, the output voltage overshoot of DC-DC buck converter controlled by nonsingular terminal sliding mode technology is far less than that using average current technology, thus greatly improving the response speed.