基于EKF的DC/DC转换器电感电流观测器  

Observers of inductor current for DC/DC converters using EKF

作　　者：童乔凌[1] 陶志威[1] 谢文[1] 刘政林[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

出　　处：《华中科技大学学报（自然科学版）》2013年第5期48-51,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

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

摘　　要：针对无电流传感器的DC/DC转换器,提出了一种基于扩展卡尔曼滤波的电感电流观测器.首先,对升压型DC/DC转换器进行了建模,得出了含非线性项的状态空间方程;然后,为了更精确地预测电感电流提出了一种更适合非线性系统的扩展卡尔曼滤波器算法,在减少由AD转换器引入的测量噪声的同时,利用扩展卡尔曼滤波器的状态方程对电感电流进行观测;最后,对提出的电流观测器进行了Simulink仿真验证.结果表明:对电路的输出电压采样后进行扩展卡尔曼滤波可以有效减小由AD转换器引入的噪声并完成对电感平均电流的观测.在硬件实现过程中无需电流传感器,可以有效降低系统成本.An inductor current observer based on extended Kalman f ilter for sensorless current DC/DC converter was introduced.Firstly,after mod eling of boost DC/DC converter,a nonlinear state-space equation was obtained. Secondly,in order to predict the inductor currents more accurately,an extende d Kalman filter algorithm was introduced,which could reduce measurement noise i ntroduced by the AD converter on output voltage sampling and observe the inducto r current using extended Kalman filter state equation.Finally,the proposed cur rent observer Simulink simulation results show that the extended Kalman filter a fter sampling of output voltage can efficiently reduce the noise introduced by t he AD converter and complete average inductor current observation.The hardware could be implemented without the current sensor to reduce the cost of the system.

关 键 词：DC DC转换器 扩展卡尔曼滤波器 非线性 状态方程 预测 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]