US 12,235,294 B2
Current sensor assemblies for low currents
Loïc André Messier, Vanzy (FR); Yannick Vuillermet, La Motte Servolex (FR); and Andreas P. Friedrich, Metz-Tessy (FR)
Assigned to Allegro MicroSystem, LLC, Manchester, NH (US)
Filed by Allegro MicroSystems, LLC, Manchester, NH (US)
Filed on Apr. 24, 2024, as Appl. No. 18/644,470.
Application 18/644,470 is a continuation of application No. 17/659,385, filed on Apr. 15, 2022, granted, now 11,994,541.
Prior Publication US 2024/0272208 A1, Aug. 15, 2024
Int. Cl. G01R 19/165 (2006.01); G01R 15/18 (2006.01); G01R 33/07 (2006.01); H05K 1/18 (2006.01)
CPC G01R 19/16504 (2013.01) [G01R 15/181 (2013.01); G01R 33/072 (2013.01); H05K 1/181 (2013.01); H05K 2201/10151 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A current sensor assembly comprising:
a first coil disposed on or in a substrate and configured to generate a first magnetic field responsive to a first electrical current passing through the first coil;
a second coil disposed on or in the substrate and configured to generate a second magnetic field responsive to a second electrical current passing through the second coil;
a first magnetic field sensing element disposed proximate to the first coil and operable to generate a first signal responsive to the first magnetic field;
a second magnetic field sensing element disposed proximate to the second coil and operable to generate a second signal responsive to the second magnetic field;
a differential circuit operable to combine the first and second signals to generate a differential signal proportional to a combination of the first electrical current and the second electrical current;
a third magnetic field sensing element disposed proximate to the first coil and operable to generate a third signal responsive to the first magnetic field passing through the third magnetic field sensing element; and
a fourth magnetic field sensing element disposed proximate to the second coil and operable to generate a fourth signal responsive to the second magnetic field passing through the fourth magnetic field sensing element;
wherein the differential circuit is further operable to generate the differential signal using the third and fourth signals.