Title :
Circuit with nonlinear transformer provides isolation for DC measurements
Author :
Filanovsky, I.M. ; Piskarev, V.A.
Author_Institution :
Alberta Univ., Edmonton, Alta., Canada
Abstract :
A nonlinear transformer that can be used to isolate a source from the measuring device is presented. A simple RL oscillator constructed with this transformer and a comparator is discussed. The oscillator uses a 220 Hammond pulse transformer and a LF356 operational amplifier with +or-12 V power supply voltage. Using a fast comparator and a small ferrite core transformer will yield a more versatile circuit. Ultimately, the multivibrator can work at frequencies to 30-40 kHz, and an electromagnetically-coupled isolation amplifier can be developed.<>
Keywords :
multivibrators; oscillators; transformers; 220 Hammond pulse transformer; 30 to 40 kHz; 70 Hz; DC measurements; LF356 operational amplifier; RL oscillator; comparator; electromagnetically-coupled isolation amplifier; ferrite core transformer; multivibrator; nonlinear transformer; Circuits; Ferrites; Frequency; Operational amplifiers; Power amplifiers; Pulse amplifiers; Pulse transformers; Pulsed power supplies; Transformer cores; Voltage-controlled oscillators;
Journal_Title :
Circuits and Devices Magazine, IEEE
