Boost型DC／DC变换器的预测无差拍控制器设计  

Predictive Dead-beat Controller Design for Boost DC/DC Converter

作　　者：闵闰[1] 童乔凌[1] 谢文[2] 熊钦[1] 

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074 [2]中国人民解放军第二炮兵指挥学院通信系信息作战教研室,湖北武汉430012

出　　处：《电力电子技术》2013年第7期5-7,共3页Power Electronics

基　　金：国家自然科学基金(61202469,61176026,60973034);华中科技大学自主创新研究基金(2011QN004)~~

摘　　要：为了提升电流模式控制下Boost DC/DC变换器的动态响应速度,采用电流预测和无差拍控制理论对控制器进行设计。给出了线性外插的预测方法和无差拍控制策略,分析了电压环路小信号模型并设计了其控制器。采用前缘调制的预测无差拍峰值电流模式控制,电感电流可以在两个周期内调整到参考量:当占空比超过0.5时,变换器不存在次谐波振荡问题,省去了斜率补偿设计。实验结果表明,与经典电流模式控制器相比,预测无差拍控制器在控制电压上跳变2 V时,能够缩短约22.6%的调节时间;在控制电压下跳变2 V时,能够缩短约9.4%的调节时间。To improve the dynamic response speed of Boost DC/DC converter under current mode controlling, the idea of current prediction and dead-beat control are used to design the current loop controller.The dead-beat control law combined with linear extrapolation is derived from the current equation.The small signal model in the voltage loop is analyzed to achieve a rational PI controller.Using leading edge modulation, the predictive dead-beat controller can adjust the peak current to the reference in two switching cycles,which improves control performance.In addition,the converter do not have the potential of oscillation even when the duty ratio exceeds 0.5, which must be compensated by an additional slope in classical current mode design.Experimental results show that, compared to the classical cur- rent mode controller,the dead-beat controller can decrease the regulation time by 22.6% when the control voltage steps up by 2 V, and by 9.4% when the control voltage steps down by 2 V.

关 键 词：控制器 电流模式 预测电流控制 无差拍控制 

分 类 号：TM517[电气工程—电器]