Buck变换器的数字电流滞环控制策略的改进
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摘要
基于已有的数字电流滞环控制的Buck DC-DC变换器控制策略和实验结果,分析了造成负载突变时出现动态响应时间长及输出电压无法恢复到期望值的原因,提出了一种改进的控制策略。该控制策略在沿用已有的控制策略的基础上,增加了对负载突变过程的检测,如果发生负载突变情形,自动切换到新的控制策略。针对负载突增和突减,分别建立突变过程的数学模型,设计相应的控制策略,给出硬件测试结果。实验结果表明,该控制策略在稳态控制和动态过程控制中都是正确可行的,在保证稳态时输出电压精度的基础上,明显改善了变换器的动态特性。
Based on the existing control strategy and experimental result of the digital current following controlling Buck DC-DC converter, the reasons why load chances the dynamic response time is long and the output voltage can not recover expected value are analyzed, and an improved control strategy is proposed. Based on the existing control strategy, the improved control strategy adds the detection of the load changes process. If the load changes occur, the new control strategy is switched automatically. According to the shock loading and unloading, the mathematical models of the changes are established respectively, the corresponding control strategies are designed, and the hardware test results are given. The experimental results show that the proposed control strategy is correct and feasible in steady state control and dynamic process control. On the basis of ensuring the output voltage accuracy in steady state, the dynamic performance of the converter is improved.
Based on the existing control strategy and experimental result of the digital current following controlling Buck DC-DC converter, the reasons why load chances the dynamic response time is long and the output voltage can not recover expected value are analyzed, and an improved control strategy is proposed. Based on the existing control strategy, the improved control strategy adds the detection of the load changes process. If the load changes occur, the new control strategy is switched automatically. According to the shock loading and unloading, the mathematical models of the changes are established respectively, the corresponding control strategies are designed, and the hardware test results are given. The experimental results show that the proposed control strategy is correct and feasible in steady state control and dynamic process control. On the basis of ensuring the output voltage accuracy in steady state, the dynamic performance of the converter is improved.
引文
[1]贾淑文.智能并联均流的DC-DC变换器研究[D].西安:西安科技大学,2011.JIA Shu-wen.Research intelligent parallel flow method of DC-DC converter[D].Xi’an:Xi’an University of Science and Technology,2011.
[2]刘健,程红丽,王立,等.电流跟踪数字控制的Buck DC-DC变换器[J].电工技术学报,2011,26(8):50-56.LIU Jian,CHENG Hong-Li,WANG Li,et al.A current following digital controlled Buck DC-DC converter[J].Transactions of China Electrotechnical Society,2011,26(8):50-56.
[3]程红丽,强新娟,刘健.数字电流滞环控制的Buck-Boost DC/DC变换器[J].电力电子技术,2010,12:56-58.CHENG Hong-li,QIANG Xin-juan,LIU Jian.A digital current following controlled Buck-Boost DC/DC converter[J].Power Electronics,2010,12:56-58.
[4]刘晓东,邱亚杰,方炜,等.Boost变换器电容电荷平衡动态最优控制[J].电力自动化设备,2011,31(5):63-66.LIU Xiao-dong,QIU Ya-jie,FANG Wei,et al.Optimal dynamic control based on capacitor charge balance for boost converter[J].Electric Power Automation Equipment,2011,31(5):63-66.
[5]方炜,邱亚杰,刘晓东,等.基于电容电荷平衡的Boost型变换器控制研究[J].电子科技大学学报,2013,42(2):244-248.FANG Wei,QIU Ya-jie,LIU Xiao-dong,et al.Research of control strategy based on capacitor charge balance for the boost cenverter[J].Journal of University of Electronic Science and Technology of China,2013,42(2):244-248.
[6]倪雨,许建平,于海坤,等.Buck变换器最优负载瞬态特性分析[J].中国电机工程学报,2010,24:8-14.NI Yu,XU Jian-ping,YU Hai-kun,et al.Optimal load transient performance analysis for buck converter[J].Proceedings of the CESS,2010,24:8-14.
[7]马红波,冯全源.BUCK型开关变换器最优PID控制器设计[J].电机与控制学报,2008,12(8):639-643.MA Hong-bo,FENG Quan-yuan.Optimized PID controller design for buck DC-DC switching converters[J].Electric Machines and Control,2008,12(8):639-643.
[8]孙大鹰,徐申,孙伟锋,等.Buck型DC-DC变换器中数字预测模糊PID控制器的设计与实现[J].东南大学学报(自然科学版),2014,9(5):897-901.SUN Da-ying,XU Shen,SUN Wei-feng,et al.Design and implement of digital fuzzy PID controller with prediction algorithm for Buck DC-DC converter[J].Journal of Southeast University(Natural Science Edition),2014,9(5):897-901.
[9]JUN Cheng,ZHEN Ma,HONG Zhang.A voltage mode buck DC-DC converter with automatic PWM/PSM mode switching by detecting the transient inductor current[C]//Analog Integrated Circuits and Signal Processing.Xi’an,China:Springer Link,2014.
[10]倪雨,许建平,王金平,等.滞环控制全局滑模控制Buck变换器设计[J].中国电机工程学报,2010,30(21):1-6.NI Yu,XU Jian-ping,WANG Jin-ping,et al.Design of global sliding mode control buck converter with hysteresis modulation[J].Proceedings of the CSEE,2010,30(21):1-6.
[2]刘健,程红丽,王立,等.电流跟踪数字控制的Buck DC-DC变换器[J].电工技术学报,2011,26(8):50-56.LIU Jian,CHENG Hong-Li,WANG Li,et al.A current following digital controlled Buck DC-DC converter[J].Transactions of China Electrotechnical Society,2011,26(8):50-56.
[3]程红丽,强新娟,刘健.数字电流滞环控制的Buck-Boost DC/DC变换器[J].电力电子技术,2010,12:56-58.CHENG Hong-li,QIANG Xin-juan,LIU Jian.A digital current following controlled Buck-Boost DC/DC converter[J].Power Electronics,2010,12:56-58.
[4]刘晓东,邱亚杰,方炜,等.Boost变换器电容电荷平衡动态最优控制[J].电力自动化设备,2011,31(5):63-66.LIU Xiao-dong,QIU Ya-jie,FANG Wei,et al.Optimal dynamic control based on capacitor charge balance for boost converter[J].Electric Power Automation Equipment,2011,31(5):63-66.
[5]方炜,邱亚杰,刘晓东,等.基于电容电荷平衡的Boost型变换器控制研究[J].电子科技大学学报,2013,42(2):244-248.FANG Wei,QIU Ya-jie,LIU Xiao-dong,et al.Research of control strategy based on capacitor charge balance for the boost cenverter[J].Journal of University of Electronic Science and Technology of China,2013,42(2):244-248.
[6]倪雨,许建平,于海坤,等.Buck变换器最优负载瞬态特性分析[J].中国电机工程学报,2010,24:8-14.NI Yu,XU Jian-ping,YU Hai-kun,et al.Optimal load transient performance analysis for buck converter[J].Proceedings of the CESS,2010,24:8-14.
[7]马红波,冯全源.BUCK型开关变换器最优PID控制器设计[J].电机与控制学报,2008,12(8):639-643.MA Hong-bo,FENG Quan-yuan.Optimized PID controller design for buck DC-DC switching converters[J].Electric Machines and Control,2008,12(8):639-643.
[8]孙大鹰,徐申,孙伟锋,等.Buck型DC-DC变换器中数字预测模糊PID控制器的设计与实现[J].东南大学学报(自然科学版),2014,9(5):897-901.SUN Da-ying,XU Shen,SUN Wei-feng,et al.Design and implement of digital fuzzy PID controller with prediction algorithm for Buck DC-DC converter[J].Journal of Southeast University(Natural Science Edition),2014,9(5):897-901.
[9]JUN Cheng,ZHEN Ma,HONG Zhang.A voltage mode buck DC-DC converter with automatic PWM/PSM mode switching by detecting the transient inductor current[C]//Analog Integrated Circuits and Signal Processing.Xi’an,China:Springer Link,2014.
[10]倪雨,许建平,王金平,等.滞环控制全局滑模控制Buck变换器设计[J].中国电机工程学报,2010,30(21):1-6.NI Yu,XU Jian-ping,WANG Jin-ping,et al.Design of global sliding mode control buck converter with hysteresis modulation[J].Proceedings of the CSEE,2010,30(21):1-6.