A unified model for current-programmed converters

Author

Tan, F. Dong ; Middlebrook, R.D.

Author_Institution

QSC Audio Products, Costa Mesa, CA, USA

Volume

10

Issue

4

fYear

1995

fDate

7/1/1995 12:00:00 AM

Firstpage

397

Lastpage

408

Abstract

A unified model is established for a current-programmed power converter, which is both a modification and an extension of familiar models. Inclusion of the sampling effect allows the presence of an additional pole ω_p in the current-loop gain to be derived. The resulting final double-slope asymptote is fixed in position, and the crossover frequency cannot exceed half the switching frequency. A stability parameter, Q_s, determines the additional pole and describes the degree of peaking in the closed-loop transfer function. Experimental verification employs an analog signal injection technique

Keywords

PWM power convertors; asymptotic stability; closed loop systems; control system analysis; electric current control; network analysis; poles and zeros; programmed control; switching circuits; transfer functions; crossover frequency; current regulation; current-loop gain; current-programmed power converter; final double-slope asymptote; peaking; pole; sampling effect; stability parameter; switching frequency; transfer function; unified model; Automatic programming; DC-DC power converters; Dynamic programming; Inductors; Parallel programming; Power system modeling; Sampling methods; Stability; Steady-state; Switching frequency;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.391937

Filename

391937