US 12,461,127 B2 · Non-contact DC current measurement device with open loop degaussing

Abstract

Systems, apparatus, and methods that provide a flexible current sensor capable of measuring current flowing through a conductor without contacting the conductor. In various implementations, a flexible current sensor may have a comparable size, shape, and appearance as a flexible loop of a Rogowski coil, except the current sensor described herein can sense direct current (DC). The current sensors of the present disclosure utilize a novel open loop degaussing mechanism to provide accurate DC current measurements in a conductor. To achieve this, a current sensor includes an AC degaussing coil wrapped around a magnetic core. A driver circuit drives an AC degaussing signal in the AC degaussing core, which operates to reset or degauss the magnetic core, thereby providing more accurate current measurements.

Claims20

Dependent claims

A measurement device, comprising:

a magnetic core that is positionable to surround a conductor under test;
a magnetic field sensor positioned adjacent to the magnetic core;
a winding wrapped around at least a portion of the magnetic core;
and
circuitry coupled to the winding and the magnetic field sensor, wherein the circuitry is configured to:
generate a fixed magnitude alternating current (AC) degaussing signal in the winding, the AC degaussing signal being independent of a current flowing through the conductor;
receive a magnetic field sensor signal from the magnetic field sensor representing a magnetic field induced in the magnetic core;
and
determine a measurement of electric current flowing through the conductor based on the magnetic field sensor signal.

6 more elements

Dependencies are inferred from the claim text.

Non-contact DC current measurement device with open loop degaussing

Life of this patent

Non-contact DC current measurement device with open loop degaussing

Life of this patent

Abstract

Claims20