To solve the problems of long reaching time and serious chattering in DC-DC converter when a traditional constant-speed reaching law is used,a control method with a novel reaching law is proposed to improve the speed of reaching the sliding mode surface and inhibit the inherent chattering problem in the sliding mode variable structure con-trol system. Meanwhile,inductance current state variables are added based on a mathematical model of voltage step-down variator under the traditional sliding mode voltage control(SMVC). Finally,a Buck converter sliding mode con-troller is designed using the new reaching law,and it is compared with PI controller and constant-speed reaching law method. Simulation results show that the proposed control method can effectively improve the static and dynamic charac-teristics of the system,as well as its robustness .%针对DC-DC变换器中传统等速趋近律趋近时间长、抖振严重的问题,提出了一种新型趋近律控制方法,用于提高滑模变结构控制系统中趋近滑模面的速度、抑制滑模固有的抖振问题.同时,在传统的滑模电压控制(SMVC)的Buck变换器数学模型基础上,增加了电感电流状态变量,给出了Buck变换器数学模型.最后,利用新型趋近律对Buck变换器滑模控制器进行了设计,并且与PI控制器、等速趋近律方法进行了比较.仿真结果表明,所提的控制方法能够有效地提高系统的静态、动态特性与鲁棒性.
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