Circuit with nonlinear transformer allowing DC current measurements via an isolation gap

Author

Filanovsky, I.M. ; Taylor, L.

Author_Institution

Alberta Univ., Edmonton, Alta., Canada

fYear

1992

Firstpage

318

Abstract

A sensor circuit allowing the measurement of DC current via an isolation gap is investigated. The primary coil of a nonlinear transformer and an operational amplifier are connected into an RL-multivibrator circuit. The measured DC current is applied to the secondary of this transformer. The DC voltage at the inverting mode of the operational amplifier gives information on the polarity and value of the measured current. The sensor transfer characteristics are calculated using piecewise approximation of the core magnetization characteristic, and experimentally verified

Keywords

detector circuits; electric current measurement; electric sensing devices; multivibrators; operational amplifiers; transformer magnetic circuits; DC current measurements; RL-multivibrator circuit; circuit with nonlinear transformer; core magnetization characteristic; isolation gap; magnetic multivibrator circuit; operational amplifier; piecewise approximation; sensor circuit; sensor transfer characteristics; Biomedical measurements; Circuits; Coils; Current measurement; Magnetic cores; Magnetic sensors; Magnetization; Operational amplifiers; Sensor phenomena and characterization; Transformer cores;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1992., Proceedings of the 35th Midwest Symposium on

Conference_Location

Washington, DC

Print_ISBN

0-7803-0510-8

Type

conf

DOI

10.1109/MWSCAS.1992.271296

Filename

271296