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中文摘要：
准滑模控制的滑模系数和边界层的选取因缺乏明确的关系式而难以确定，该文以相变量系统模型为基础，详细分析了准滑模控制方法的特性和在Buck变换器控制中的应用；研究了准滑模控制的边界层、滑模系数、准滑动模态区相互之间的定量数学关系，所获得的研究结果可以指导我们有效的选取滑模系数和边界层厚度。计算机仿真和实验结果表明准滑模控制器可以获得更加平滑的占空比，有利于减小输出电压的纹波，抑制系统抖振。
英文摘要：
It is difficult to determine the sliding coefficient and bound layer of the quasi-sliding mode control （QSMC） due to lack of some clear relations. Based on phaseplane model, the characteristics of QSMC and its application to the switching control of buck DC-DC converter are analyzed. The mathematical relations among boundary layer, sliding coefficient and quasi-sliding-mode area are studied to provide a guideline for the choosing sliding coefficient and the range of boundary layer. Computer simulation and experimental results show that by using QSMC, a more smooth duty ratio can be obtained to decrease output voltage ripple. The experimental results validate the simulations.
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