Patent ID: 9341657
Filing Date: 2016-05-17
CPC Classification: G01R,H01F,H05K

Claim Text:
1. An apparatus comprising a printed circuit, said printed circuit comprising a hole, a stack, one or more first coils, and a magnetic core, wherein said hole passes through said printed circuit board along a vertical axis to receive a conducting wire, wherein said stack comprises metallization layers vertically stacked and separated mechanically from one another by electrically insulating layers, wherein said one or more first coils fulfill functions of a first measurement coil and of a first excitation coil, wherein each first coil is provided with turns wound solely around said magnetic core, wherein said magnetic core forms a first magnetic ring surrounding said hole and extending horizontally between metallization layers of said stack, wherein each turn of each first coil is formed by two conducting tracks produced, respectively, in metallization layers situated above and below said first magnetic ring and by a first pad and a second pad, and wherein said first and second pads pass through an insulating layer, wherein said first pad passes through an interior of said magnetic ring, and wherein said first pad electrically links said two conducting tracks, wherein said second pad passes through an exterior of said magnetic ring, and wherein said second pad electrically links one of said conducting tracks to a conducting track of another turn of the first coil; wherein the apparatus further comprises at least one second magnetic ring that surrounds said hole and that extends horizontally between said metallization layers, one or more second coils fulfilling said functions of a second measurement coil and of a second excitation coil, each second coil being provided with turns wound only around said second magnetic ring, each turn of each second coil being formed by two conducting tracks produced, respectively, in said metallization layers situated above and below said second magnetic ring and linked electrically to one another by a pad passing through an insulating layer and passing through an interior of said second magnetic ring, and wherein said first and second measurement coils are linked in series so as to decrease a contribution of a magnetic excitation field in a current in said measurement coils.