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中文摘要：
针对常规滑模变结构控制器应用于电流连续型Boost变换器中，存在开关频率不固定等问题，提出了一种基于∑-△调制器的滑模变结构控制方法。该方法选定反映控制目的的滑模面后，引入指数趋近律的方法来设计滑模变结构控制器，控制器的输出经∑-△调制后驱动开关管；通过对控制参数的调节，可实现Boost变换器动态性能与稳态性能之间的平衡。仿真结果表明，采用所设计滑模变结构控制器的Boost变换器开关频率固定，启动性能可调，对输入电压扰动及负载大幅度突变具有较强的鲁棒性。
英文摘要：
Aiming at the unfixed switching frequency of general sliding-mode variable-structure control schemes for current conduction mode Boost converters,a sliding-mode variable-structure control strategy based on ∑-△ modulator is proposed. After the fit surface is chosen for the control objective,the exponential approach law is used to design the sliding-mode variable-structure controller,the output of which is modulated by ∑-△ and used to drive the power switches. The balance between the dynamic and static performances of Boost converter is realized by adjusting the control parameters. Simulative results show that,with the designed controller,the Boost converter has fixed switching frequency,adjustable startup performance and robustness against input voltage disturbance and big load variation.
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