Magnetic field sensor for measuring differential current

Abstract

The invention relates to a magnetic field sensor (15) for measuring a differential current intended to be subjected to a magnetic field to be measured, induced by a current flowing through at least two primary conductors, at least a portion of said primary conductors extending along an axis (Z), said current flowing through at least one of said primary conductors (4a) in a forward direction along said axis (Z), and at least one of said primary conductors (4b) in a reverse direction opposite to the forward direction. This sensor is particular in that it comprises: - an internal magnetic circuit (16) configured to form a closed loop around said primary conductors, - an external magnetic circuit (17) surrounding said internal magnetic circuit (16), - at least one coil of superparamagnetic material (SPM) (18), disposed between said internal (16) and external (17) magnetic circuits. Figure for the abstract: Fig 5

Claims

33 planes (201, 202) being substantially perpendicular to the longitudinal central axis (X); - at least one support channel (203) formed in the body (210) and in which the additional SPM coil (302) is housed, the support channel (203) extending parallel to the longitudinal central axis (X) and opening onto the two flat faces (201, 202); and in that the feedback winding (303) is formed of an electrical conductor wound on the external surface (200) of the body (210) and along the longitudinal central axis (X). 3 [Fig. 2] [Fig. 3] H>w< [Fig. 5] [Fig. 6] 4a 4b [Fig. 8] 4a 4b [Fig. 9] [Fig. 14]

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