Isolated current sensor

Details Isolated current sensor Isolated current sensor

1996-05-01

1998-11-03

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324 99R, G01R 3300

Patent

active

058314245

ABSTRACT:
An improved isolated current sensing device. The invention consists of two magnetizable cores which surround the conductor carrying the current to be measured. The two cores are cyclically saturated in opposite directions by a high-frequency excitation current counter-wound around the two cores. The device then detects through an output winding the asymmetry in the core magnetic fluxes caused by the current-carrying conductor. The output signal is passed through a phase-sensitive detector tuned to twice the original excitation frequency. Negative feedback is used to stabilize the device.

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patent: 4286211 (1981-08-01), Nakamura et al.
patent: 5132608 (1992-07-01), Nishifuji et al.

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