A simple model predicts small-signal control loop behavior of magamp post-regulator

Author

Chen, Day Y. ; Lee, John ; Jamerson, Cliff

Author_Institution

Virginia Power Electron. Center, Virginia Polytech. Inst. State Univ., Blacksburg, VA, USA

Volume

4

Issue

4

fYear

1989

fDate

10/1/1989 12:00:00 AM

Firstpage

402

Lastpage

408

Abstract

A block diagram approach is used to provide an insight into magamp feedback control operation. The analysis reveals a pole-shifting phenomenon inherent in the type-A loop transfer function. A procedure for calculating the gain and open-loop poles in the control loop of each reset circuit is given. The procedure also shows how to compensate the error amplifier for stable operation. The detailed example of a 50 kHz magamp is given; however, the validity of the model has been demonstrated experimentally at 100 kHz. With a factor of two included in the Faraday´s law block, the model describes loop behavior for a magamp with two saturable reactors for symmetrical topology

Keywords

control system analysis; feedback; magnetic amplifiers; poles and zeros; transfer functions; 100 kHz; 50 kHz; Faraday´s law block; block diagram approach; compensation; error amplifier; feedback; magamp post-regulator; magnetic amplifiers; model; open-loop poles; pole-shifting phenomenon; reset circuit; saturable reactors; small-signal control loop behavior; type-A loop transfer function; Circuits; Filters; Open loop systems; Operational amplifiers; Predictive models; Pulse width modulation converters; Regulators; Resonance; Resonant frequency; Transfer functions;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.41767

Filename

41767