断续导通模式的Buck变换器反步滑模控制  

Backstepping Sliding Mode Control for Buck Converter in DCM

作　　者：沈艳霞[1] 陈进军[1] 

机构地区：[1]江南大学电气自动化研究所,江苏无锡214122

出　　处：《南京理工大学学报》2008年第6期754-758,共5页Journal of Nanjing University of Science and Technology

基　　金：江苏省自然科学基金(BK2007540);江南大学创新团队发展计划(200702)

摘　　要：为进一步提高Buck变换器的控制性能,针对Buck变换器的非线性特性,考虑其在电感电流断续导通模式下的数学模型,采用反步滑模法设计了闭环控制器。基于系统生成器提出了数字控制器的实现方法,分析了其负载扰动和电源扰动特性。与PI控制方式相比较,在Buck变换器的启动阶段,采用反步滑模控制器的系统输出电压的上升速度快、调节时间短、超调小,当Buck变换器的负载和电源参数发生突变时,反步滑模控制的输出电压能够及时调整、扰动幅度小。比较结果表明反步滑模控制的优越性和SG设计开发的有效性,为现场可编程门阵列实现Buck变换器的数字控制器提供了新的设计流程,也为进一步研究其它直流-直流变换器的非线性控制提供了新思路。Taking account of the nonlinear characteristics of Buck converter, a closed loop controller using backstepping sliding mode method is proposed to improve its control performances. The discontinuous current mode （DCM） of the converter is considered. A design method of digital controller via system generator （SG） is proposed with analysis of the performances undergoing disturbances from both load and power supply. The simulation results show that： compared with the PI controller, the backstepping sliding mode control system has quicker responses, shorter setting time and smaller overshoot. Under the disturbances from the load and power, the proposed system can adjust the output voltage in time and the dynamical change is also small. All these results imply that the proposed controller is superior to the PI controller. This design also provides a novel design flow of the digital controller for Buck converter using field-programmable gate array, as well as a new way for further research of nonlinear control for the other direct current to direct current （DC-DC） converters.

关 键 词：BUCK 变换器 断续导通模式 反步滑模法 系统生成器 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]