HIGH-FREQUENCY OSCILLATION PARAMETRIC CURRENT SENSOR WITH FEEDBACK LOOP

This paper deals with a noncontact current sensor that operates from d c to high frequency. This sensor utilizes the phenomenon of parametric oscillation, whereby the parametric oscillation voltage is amplitude- modulated by the magnetic field of the measured current. The proposed sensor has been operated closed loop up to 3 kHz for measured current and as expected has better performance characteristics than the open l oop version. In this paper, we describe the features of this novel cur rent sensor and ways to extend the high-frequency limit. Experimental results are given to support the theoretical analysis.