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基于离散变速趋近律的模糊滑模高频开关电源控制

, PP. 108-117

Keywords: 高频开关电源,准线性建模,切换函数,变速趋近律,模糊滑模变结构控制

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Abstract:

状态空间平均法建立的小信号模型存在不适用于工作点在较大参数范围内变化的局限性,为了克服该缺点,采用准线性建模方法对移相全桥高频开关电源进行建模。在此基础上,选取了线性切换函数和基于变速趋近律的控制率,设计了一种高频开关电源模糊滑模变结构控制器。该控制器能够克服传统高频开关电源控制器动态响应特性较慢、对系统条件突变调节效果不理想的不足。仿真结果表明,所设计的模糊滑模变结构控制器与一般滑模变结构控制器相比,具有更好的控制效果、鲁棒性和动态性能,有效降低了抖振。利用所设计的控制器实现了对1.2kW高频开关电源样机的良好控制,进一步证明了所提方法的有效性。

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