针对同步Buck变换器设计了基于改进次优算法的二阶滑模控制器，只需检测变换器的输出电压，不需测量电容和电流，就可实现对变换器的控制。通过对次优算法引入滞环，在输出电压达到稳态时限制了变换器的开关频率。在Simulink环境下，构建状态机实现了二阶滑模控制器，验证了同步Buck变换器的启动性能和稳态性能，以及从10 A跃变到20 A大负载扰动和5 V跃变到10 V电源扰动时的鲁棒性。仿真结果表明，基于改进次优算法的二阶滑模控制器保留了滑模控制的鲁棒性，并在抵抗扰动方面优于一阶滑模。
A second-order sliding-mode controller based on improved sub-optimal algorithm for synchronous Buck converter is designed, and the converter can be controlled only by detecting its output voltage without measuring the capacitance current of the converter. By introducing hysteresis to sub-optimal algorithm,the switching frequency of the converter is limited when the output voltage is stable. In the Simulink,the second-order sliding-mode controller is actualized by using the state machine, and the simulation test verifies the start-up performance, the steady-state behavior and the robust against the large load disturbance jump from 10 A to 20 A and the power disturbance jump from 5 V to 10 V. The simulation results show that the proposed second-order sliding-mode controller retains the robustness of sliding mode control and is superiors to first-order sliding-mode control in the aspect of resisting disturbance.
刘松斌,冯志远.基于次优算法同步Buck变换器二阶滑模控制[J].重庆大学学报,2018,41(3):1-12.
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