基于SG的Buck变换器自适应反步法控制

针对Buck变换器的非线性特性,考虑在电感电流连续导通模式下的数学模型,采用自适应反步法设计其闭环控制器,同时基于System Generator提出了数字控制器的实现方法,并分析了其负载扰动和电源扰动特性,将仿真结果与PI控制方式相比较,结果表明自适应反步控制的优越性和System Generator设计开发的有效性,为FPGA实现Buck变换器的数字控制器提供了新的设计流程,也为进一步研究其他DC-DC变换器的非线性控制提供了新思路.

Adaptive Backstepping Control for Buck Converter via System Generator

Taking the nonlinear characteristic of Buck converter,a closed loop controller using adaptive backstepping method is presented based on the continuous current mode of the converter. A design method of digital controller via system generator(SG)is proposed. The performance undergoing disturbances both from load and power is analyzed. The simulation results show that the adaptive backstepping controller is superior to the PI controller. A novel design flow of the digital controller is provided for Buck converter using FPGA,as well as a new way is provided for further research of nonlinear control for other DC-DC converters.