Time-varying effects and averaging issues in models for current-mode control

Author

Perreault, David J. ; Verghese, George C.

Author_Institution

Lab. for Electromagn. & Electron. Syst., MIT, Cambridge, MA, USA

Volume

12

Issue

3

fYear

1997

fDate

5/1/1997 12:00:00 AM

Firstpage

453

Lastpage

461

Abstract

This paper investigates issues in modeling of current-mode control in converters. The effects of the current-sampling intrinsic to current-mode control are analyzed, and inadequately recognized limitations of linear time-invariant (LTI) models at high frequencies (where the system behavior is time-varying) are exposed. The paper also examines the geometric methods used to derive duty-ratio constraints in averaged models of current-mode control and points out the sources of discrepancies among various models. The conclusions are supported by simulation and experimental results

Keywords

control system analysis; electric current control; power convertors; time-varying systems; averaging issues; converters; current-mode control models; current-sampling; duty-ratio constraints; geometric methods; linear time-invariant models; time-varying effects; Control design; Control system analysis; Inductors; Power system modeling; Predictive models; Sampling methods; Solid modeling; Switches; Time varying systems; Transfer functions;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.575673

Filename

575673