US 12,436,173 B2
Current sensor system
Mathieu Gallot, Bevaix (CH); and Robert Racz, Bevaix (CH)
Assigned to MELEXIS TECHNOLOGIES SA, Bevaix (CH)
Filed by Melexis Technologies SA, Bevaix (CH)
Filed on Mar. 20, 2023, as Appl. No. 18/186,520.
Claims priority of application No. 22163920 (EP), filed on Mar. 23, 2022.
Prior Publication US 2023/0305040 A1, Sep. 28, 2023
Int. Cl. G01R 15/20 (2006.01); G01R 19/00 (2006.01)
CPC G01R 15/202 (2013.01) [G01R 15/207 (2013.01); G01R 19/0092 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A current sensor system for measuring an AC electrical current having frequencies in a predefined frequency range, the current sensor system comprising:
an electrical conductor portion extending in a first direction and configured for conducting said AC electrical current, thereby creating a first magnetic field;
a U-shaped magnetic shielding partially surrounding said electrical conductor portion, and having a central shielding portion extending in a second direction perpendicular to the first direction, and having two shielding leg portions extending in a third direction perpendicular to the first and second direction;
a metal plate or a metal layer arranged at a predefined distance from the shielding leg portions for allowing eddy currents to flow in said metal plate or metal layer, thereby creating a second magnetic field which is superimposed with the first magnetic field;
a magnetic sensor device arranged between the conductor portion and the metal plate or metal layer, and arranged inside a space between the two shielding leg portions of the U-shaped magnetic shielding, and configured for measuring a magnetic field component oriented in the second direction;
wherein the metal plate or metal layer has a length larger than a length of the shielding measured in the first direction, and a width larger than 90% of a distance between inner sides of the shielding leg portions, and a thickness; or
the metal plate or metal layer is a portion of a metal housing with a cavity in the vicinity of the magnetic sensor, the cavity defined by the metal plate or metal layer having a reduced thickness relative to the metal housing.