摘要
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1.2k W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。
Small signal model set up by state space averaging method has limitations to the case of set-point varying in larger parameter range. The quasi-linear modeling method is used to model the phase-shift full bridge high frequency switching power supply in this paper. On the basis of this model, a fuzzy sliding mode variable structure controller of the high frequency switching power supply is designed, by selecting linear switching function and control rate according to the variable rate reaching law. The controller is able to overcome the drawbacks of the traditional high frequency switching power supply controller, such as the low dynamic response and non-ideal adjustment of system mutation. The simulation results show that compared to the sliding mode variable structure controller, the proposed controller is better in control effect, robustness and dynamic performance, and also reduces the chattering effectively. The good control to 1.2kW high frequency switching power supply is realized by the proposed controller, which can further prove that the proposed method is effective.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第20期108-117,共10页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划(973计划)(2014CB360520)
国家自然科学基金(61203114)资助项目
关键词
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
High frequency switching power supply, quasi-linear modeling, switching function, variable speed reaching law, fuzzy sliding mode variable structure control
