Modeling of control loop behavior of magamp post regulators

Author

Lee, Ing-Jen ; Chen, Dan Y. ; Wu, Yan-Pei ; Jamerson, Cliff

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Hsinhua, Taiwan

Volume

5

Issue

4

fYear

1990

fDate

10/1/1990 12:00:00 AM

Firstpage

476

Lastpage

484

Abstract

Small signal-control models are presented for a magnetic amplifier switching-mode post regulator for SMPS applications. Two commonly used current reset schemes are considered; an external reset scheme and a self-reset scheme. It is mathematically shown that the open-loop gain is a two-pole, single-zero transfer function for continuous-mode operation and is a single pole transfer function for discontinuous mode operation. The equations for predicting the open-loop gains for both types of reset circuits are derived and verified experimentally. It is shown that the open-loop gain characteristics of a magnetic-amplifier regulator depends on power circuit parameters, the reset-circuit parameters, and the saturable reactor parameters. Models for both continuous mode and discontinuous modes of operation that provide designers with useful tools for designing a compensation network for the feedback error amplifier are presented

Keywords

control system analysis; feedback; magnetic amplifiers; poles and zeros; switched mode power supplies; transfer functions; compensation; control loop behavior; current reset schemes; feedback error; magamp post regulators; magnetic amplifier; open-loop gain; poles; power circuit; saturable reactor; small signal control models; transfer function; zeros; Equations; Feedback; Inductors; Magnetic circuits; Magnetic switching; Open loop systems; Operational amplifiers; Regulators; Switched-mode power supply; Transfer functions;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.60692

Filename

60692