Title :
Time-varying effects in models for current-mode control
Author :
Perreault, David J. ; Verghese, George C.
Author_Institution :
Lab. for Electromagn. & Electron. Syst., MIT, Cambridge, MA, USA
Abstract :
This paper investigates issues in modeling of current-mode controlled DC-DC converters. The effects of the current-sampling intrinsic to current-mode control are analyzed, and inadequately recognized limitations of linear, time invariant models at high frequencies are exposed. The paper also examines the geometric methods used to derive duty ratio constraints in averaged models of current-mode control. The conclusions are supported by simulation and experimental results
Keywords :
DC-DC power convertors; electric current control; time-varying systems; DC-DC converters; averaged models; current-mode control; current-sampling intrinsic control; duty ratio constraints; geometric methods; high frequencies; linear time invariant models; time-varying effects; Control design; Frequency; Inductors; Open loop systems; Predictive models; Sampling methods; Solid modeling; Switches; Transfer functions; Voltage control;
Conference_Titel :
Power Electronics Specialists Conference, 1995. PESC '95 Record., 26th Annual IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-2730-6
DOI :
10.1109/PESC.1995.474883
