Auto-zeroing current sensing element

Details Auto-zeroing current sensing element Auto-zeroing current sensing element

1997-07-24

1999-09-14

Strecker, Gerard

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324 96, 324127, G01R 1900, G01R 3300

Patent

active

059528192

ABSTRACT:
A current sensor for sensing alternating current in a current-carrying conductor includes a substantially C-shaped magnetic core having first and second ends with a gap therebetween. A current sensing element, which includes a microresonant element, is positioned proximate the gap between the first and second ends of the magnetic core such that the element oscillates when exposed to an alternating magnetic field. A biasing coil is attached to the micro-resonant element for carrying a bias current. The micro-resonant element resonates, or vibrates, at a standard oscillating frequency when no current is present in the biasing coil, and resonates at a modified oscillating frequency when current is present in both the biasing coil and the current-carrying conductor. The magnitude of current in the current-carrying conductor is determined as a multiple of the product of a ratio of the standard oscillating frequency and the modified oscillating frequency, and the bias current.

REFERENCES:
patent: 5146156 (1992-09-01), Marcel
patent: 5296802 (1994-03-01), Beranger et al.
patent: 5485079 (1996-01-01), Itoh
patent: 5734264 (1998-03-01), Berna et al.

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