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Design of variable parameter proportional integral controlled BUCK converter(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2016年05
Page:
68-76
Research Field:
Publishing date:

Info

Title:
Design of variable parameter proportional integral controlled BUCK converter
Author(s):
FENG Quan-yuan YAN Hong-ju
 ( Institute of Microelectronics,Southwest Jiaotong University,Chengdu 611756,China)
Keywords:
proportional integral disturbance control method feed-forward compensation variable param-eters PI controller disturbance observer convergence rate
PACS:
TM 46
DOI:
10. 15938 / j. emc. 2016. 05. 010
Abstract:
There are a variety of disturbances existing in the BUCK converter,including uncertain param-eters,input voltage variation and load changes. These disturbances have a significant impact on output BUCK converter. By using traditional proportional integral ( PI) control the method,it is difficult to a-chieve satisfactory control effect. By the traditional PI control method it is difficult to obtain satisfactory performance. Based on the traditional PI control strategy( variable parameters proportional integral,VA-PI) control strategy was proposed to address the problem of interference system. Since VAPI controller not only has the advantage of traditional PI controller fast transient response and eliminating static error, etc. ,but also adjusts the corresponding parameters at different stages,so BUCK converter in each stage has better characteristics. Conventional proportional integrator was replaced by a first variable parameter proportional integral,and the disturbance observer was designed to observe the parameter perturbation and load variations caused by system disturbances,as compensation to compensate feedforward channel and to improve the convergence speed of the system and disturbance rejection. Finally,simulation and experi-ments proved the validity of the algorithm respectively.

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Last Update: 2016-06-26