直流变换器的电流控制性能对比与数字实现  

Contrast and Realization of Current Control Performance for DC Converter

作　　者：吴少聪 苏建徽[1] 施永[1] 赖纪东[1] WU Shao-cong;SU Jian-hui;SHI Yong;LAI Ji-dong(Engineering Research Center of Ministry of Education of Photovoltaic System,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学,光伏系统教育部工程研究中心,安徽合肥230009

出　　处：《电力电子技术》2021年第11期93-96,共4页Power Electronics

基　　金：国家自然科学基金(51907045);中央科研基本业务费支持项目(PA2020GDGP0053)。

摘　　要：基于DSP数字控制的DC/DC变换器,其电流环路的控制一般采用平均电流模式。峰值电流控制一般由模拟芯片实现,且存在稳定问题,需要设计斜坡补偿电路。此处以Buck变换器为例,对两种电流控制进行小信号建模,并仿真对比了动态和稳态性能,结果表明峰值电流控制具有更快的动态响应速度;为了追求高动态性能,利用DSP特有的AD比较功能实现了峰值电流的数字控制,并提出和分析了一种数字斜坡补偿方法,研制的500 W样机实验验证了所提方法的正确性和有效性。The current loop control of DC/DC converter based on DSP digital control generally adopts the average current mode.The peak current control is usually implemented by analog chip and there is a problem of stability,so it is necessary to design a slope compensation circuit.Taking the Buck converter as an example,the small signal models of the two current control methods are established and the dynamic and steady-state performances are simulated and compared.The results show that the peak current control has faster dynamic response speed.In order to pursue high dynamic performance,the peak current control is realized based on the ad comparison function of DSP.A digital slope compensation method is proposed and analyzed.The experimental results of a 500 W prototype verify the effectiveness and correctness of the proposed method.

关 键 词：变换器 平均电流模式 峰值电流控制 

分 类 号：TM46[电气工程—电器]