Title :
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
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;
Conference_Titel :
Circuits and Systems, 1992., Proceedings of the 35th Midwest Symposium on
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-0510-8
DOI :
10.1109/MWSCAS.1992.271296
