Boost变换器的积分电流观测器设计
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摘要
为了解决传统电流模式控制中电流传感器增加系统成本和体积的问题,提出一种积分电流观测器.首先介绍了基于积分电流观测器的电流模式控制的Boost变换器系统结构,分析电感电流的变化规律和推导占空比算法.然后基于电感电流的变化规律,提出积分电流观测器.最后分别通过仿真和实验对提出的电流观测器进行验证,实验结果表明,积分电流观测器估算的电流与实际电感电流的误差都在4.375%以内,且在输入电压与负载跳变时,观测电流可以快速准确估算出实际电感电流.
In order to solve the problem that the current sensor increases the system cost and volume in the traditional current mode control, an integrated current observer is proposed. Firstly, the structure of Boost converter system based on current mode control with integral current observer is introduced. The variation law of inductor current is analyzed and the duty cycle algorithm is derived. Then based on the variation law of the inductor current, an integrated current observer is proposed. Finally, the proposed current observer is verified by simulation and experiment, the experimental results show that the error between the current estimated by the integrated current observer and the actual inductor current is within 4.375%, and the observed current can quickly and accurately estimate the actual inductance current when the input voltage and load change.
In order to solve the problem that the current sensor increases the system cost and volume in the traditional current mode control, an integrated current observer is proposed. Firstly, the structure of Boost converter system based on current mode control with integral current observer is introduced. The variation law of inductor current is analyzed and the duty cycle algorithm is derived. Then based on the variation law of the inductor current, an integrated current observer is proposed. Finally, the proposed current observer is verified by simulation and experiment, the experimental results show that the error between the current estimated by the integrated current observer and the actual inductor current is within 4.375%, and the observed current can quickly and accurately estimate the actual inductance current when the input voltage and load change.
引文
[1] ZHOU G, XU J, WANG J, et al. Comparison study on digital peak current, digital peak voltage, and digital peak voltage/peak current Controlled Buck Converter[C]// Industrial Electronics and Applications, 2009. Iciea 2009. IEEE Conference on. IEEE, 2009:799-804.
[2] CHEN J, PRODIC A, ERICKSON R W, et al. Predictive digital current programmed control[J]. Trans on IEEE Power Electronics, 2003, 18(1):411-419.
[3] 王志勇,柯曾喜,王云.电流型控制开关变换器的分析与设计[J].微电子学与计算机,2007,24(2):96-98.
[4] LAI Y S, YEH C A. Predictive Digital-Controlled Converter With Peak Current-Mode Control and Leading-Edge Modulation[J]. IEEE Transactions on Industrial Electronics, 2009, 56(6):1854-1863.
[5] DAVOUDI A, JATSKEVICH J. Parasitics Realization in State-Space Average-Value Modeling of PWM DC-DC Converters Using an Equal Area Method[J]. IEEE Transactions on Circuits & Systems I Regular Papers, 2007, 54(9):1960-1967.
[6] MATTAVELLI P. Digital control of DC-DC boost converters with inductor current estimation[C]// Applied Power Electronics Conference and Exposition, 2004. Apec '04. Nineteenth IEEE. IEEE, 2004:74-80 Vol.1.
[7] 童乔凌,陶志威,谢文,等.基于EKF的DC/DC转换器电感电流观测器[J].华中科技大学学报(自然科学版),2013,41(5):48-51.
[8] 陈晨,童乔凌,谢文,等.基于改进EKF的DC/DC转换器电感电流观测器[J].微电子学与计算机,2014,31(6):125-128.
[2] CHEN J, PRODIC A, ERICKSON R W, et al. Predictive digital current programmed control[J]. Trans on IEEE Power Electronics, 2003, 18(1):411-419.
[3] 王志勇,柯曾喜,王云.电流型控制开关变换器的分析与设计[J].微电子学与计算机,2007,24(2):96-98.
[4] LAI Y S, YEH C A. Predictive Digital-Controlled Converter With Peak Current-Mode Control and Leading-Edge Modulation[J]. IEEE Transactions on Industrial Electronics, 2009, 56(6):1854-1863.
[5] DAVOUDI A, JATSKEVICH J. Parasitics Realization in State-Space Average-Value Modeling of PWM DC-DC Converters Using an Equal Area Method[J]. IEEE Transactions on Circuits & Systems I Regular Papers, 2007, 54(9):1960-1967.
[6] MATTAVELLI P. Digital control of DC-DC boost converters with inductor current estimation[C]// Applied Power Electronics Conference and Exposition, 2004. Apec '04. Nineteenth IEEE. IEEE, 2004:74-80 Vol.1.
[7] 童乔凌,陶志威,谢文,等.基于EKF的DC/DC转换器电感电流观测器[J].华中科技大学学报(自然科学版),2013,41(5):48-51.
[8] 陈晨,童乔凌,谢文,等.基于改进EKF的DC/DC转换器电感电流观测器[J].微电子学与计算机,2014,31(6):125-128.