Magnetic core with superparamagnetic particles for current and magnetic field sensors
AssigneeNeelogy
InventorLuc Lucien Marie Lenglet
Life of this patent
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Abstract
A magnetic core for a magnetic field sensor is made from a material having a solid matrix in which are dispersed superparamagnetic particles, the solid matrix being chosen so as not to perturb the magnetic properties of the superparamagnetic particles, and so that the superparamagnetic particles represent a percentage P of the total volume of the core chosen to be greater than 2.5% or chosen in the span defined by the relation L 10%≦P≦L−1% where L corresponds to a threshold L beyond which the core loses the superparamagnetic properties. A magnetic field sensor that includes the magnetic core and an electronic circuit for measuring a magnetic field induced in the magnetic core.
Claims35
A magnetic core for implementation in a magnetic field sensor,
- wherein the magnetic core is made from a material comprising a solid matrix in which are dispersed superparamagnetic particles, the solid matrix being chosen so as not to perturb magnetic properties of the superparamagnetic particles, and
- wherein the superparamagnetic particles represent a percentage P of the total volume of the core chosen to be greater than 2.5%.
A magnetic core for implementation in a magnetic field sensor,
- wherein the magnetic core is made from a material comprising a solid matrix in which are dispersed superparamagnetic particles, the solid matrix being chosen so as not to perturb magnetic properties of the superparamagnetic particles, and
- wherein the superparamagnetic particles represent a percentage P of the total volume of the core chosen in the span defined by the relation L−10%≦P≦L−1% where L corresponds to a threshold L beyond which the core loses its superparamagnetic properties.
A magnetic field sensor, comprising:
- a magnetic core made from a material comprising a solid matrix in which are dispersed superparamagnetic particles, the solid matrix being chosen so as not to perturb magnetic properties of the superparamagnetic particles;
- and
- an electronic circuit for measuring a magnetic field induced in the magnetic core,
- wherein the electronic circuit comprises a source for generating an excitation field, and the induced magnetic field includes the magnetic excitation field, and
- wherein the electronic circuit generates a feedback magnetic field suitable for permanently maintaining an amplitude of the induced magnetic field in an operating span [Hmin;
- Hmax] in which the magnetic core is never saturated.
Dependencies are inferred from the claim text.