基于自适应PI控制的superbuck变换器  

A superbuck Converter Based on Adaptive PI Control

作　　者：王胤瑜 洪昊[1] 朱立颖[2] 童乔凌[1] WANG Yin-yu;HONG Hao;ZHU Li-ying;TONG Qiao-ling(Huazhong University of Science and Technology,Wuhan 430074,China;不详)

机构地区：[1]华中科技大学,集成电路学院,湖北武汉430074 [2]北京空间技术研究院,北京空间飞行器总体设计部,北京100094

出　　处：《电力电子技术》2024年第10期89-92,共4页Power Electronics

基　　金：国家自然科学基金(62074067)。

摘　　要：针对superbuck变换器稳定性易受参数偏移和工况变化影响的问题,提出了一种基于瞬态事件捕获的自适应比例积分(PI)控制方法。在该方法中,事件捕获电路通过计算瞬态响应中输出电压的上冲和下冲次数,根据振荡周期把电压响应分类成不同的瞬态事件。更进一步,对不同的瞬态事件进行加权计算得到PI控制器中的增益,从而调节系统带宽和相位裕度。在阻尼网络发生参数偏移的情况下,当参考电压从25 V变化到28 V时,振荡最大幅度从2 V减小到400 mV。100 W superbuck变换器的实验结果表明,自适应PI控制器在参数偏移和工况变化下有效地改善稳定性。An adaptive proportion integral(PI)control method based on transient event capturing circuit is proposed to solve the problem that the stability of superbuck converter is easily affected by parameter deviation and operating condition change.In the control method,event capturing circuit counts up-crossings and down-crossings of the output voltage,and classifies the voltage response into different transient events according to oscillation cycles.Furthermore,the gain of PI controller is obtained by weighting calculating different events to adjust the bandwidth and phase mar-gin of system.When the reference voltage changes from 25 V to 28 V,the maximum oscillation amplitude is reduced from 2 V to 400 mV in the case of parameter deviation in the damping network.Experimental results of 100 W super-buck converter verify effectiveness of the adaptive PI controller for improving the stability at parameter deviation and operating condition change.

关 键 词：变换器 瞬态事件捕获 自适应比例积分控制 

分 类 号：TM46[电气工程—电器]