Modeling and design of SR-Buck converter with parallel current mode control method

Author

Xiaodong Liu ; Li Han ; Wei Fang ; Yanfei Liu

Author_Institution

Key Lab. of Power Electron. & Motion Control, Anhui Univ. of Technol., Ma´anshan, China

fYear

2013

fDate

19-21 June 2013

Firstpage

1221

Lastpage

1226

Abstract

This paper presents a novel current mode controller for the synchronous rectifier Buck (SR-Buck) converter. In term of the discrete equation, the required duty cycle can be calculated directly with two parallel terms: the current term and the voltage term. Based on the analysis of the proposed algorithm, the small signal model of the closed-loop system is derived, thus a proportional and integral compensation strategy is suggested to achieve fast output voltage control. The resultant control system achieves rapid and precise output voltage regulation for both input voltage and output load changes. Furthermore, the theoretical analysis is confirmed by experimental investigations.

Keywords

closed loop systems; electric current control; power convertors; rectifying circuits; voltage control; SR-buck converter; closed-loop system; current term; discrete equation; fast output voltage control; integral compensation strategy; output voltage regulation; parallel current mode control method; proportional compensation strategy; small signal model; synchronous rectifier buck converter; voltage term; Algorithm design and analysis; Field programmable gate arrays; Inductors; Load modeling; Switches; Switching circuits; Voltage control; digital control; parallel current-mode control; small-signal model; synchronous rectifier Buck converter;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics and Applications (ICIEA), 2013 8th IEEE Conference on

Conference_Location

Melbourne, VIC

Print_ISBN

978-1-4673-6320-4

Type

conf

DOI

10.1109/ICIEA.2013.6566553

Filename

6566553