Title :
A magnetic-modulator-type current-dividing highly stable DC current transformer for large current
Author :
Abe, M. ; Tsujimura, H. ; Nakazoe, J.
Author_Institution :
Musashi Inst. of Technol., Tokyo, Japan
Abstract :
A highly stable current-dividing DC current transformer system using a second-harmonic type of magnetic modulator has been developed for a several-hundred-ampere highly regulated current source which is required for nuclear magnetic resonance measurements. The system consists of a resistive current divider, two choke coils, and two magnetic modulator ampere-turn comparators, using relatively small cores, with feedback. The performance of the regulated current source was tested by setting the current supply to 200 A. A temperature drift of 3 p.p.m./ degrees C in the regulated output current was achieved.<>
Keywords :
coils; comparators (circuits); constant current sources; current transformers; dividing circuits; modulators; nuclear magnetic resonance spectroscopy; power supplies to apparatus; 200 A; DC current transformer; ampere-turn comparators; choke coils; constant current source; magnetic modulator; nuclear magnetic resonance measurements; regulated current source; resistive current divider; second-harmonic; temperature drift; Coils; Current measurement; Current transformers; Inductors; Magnetic cores; Magnetic modulators; Magnetic resonance; Nuclear magnetic resonance; Nuclear measurements; Transformer cores;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.110062
