Busbar and power module with busbar
A busbar for current transport comprises conductive material, which extends along a current direction. A recess for a magnetic field sensor extends into the conductive material, a middle of the recess being shifted by a predetermined distance from a middle of the conductive material in the direction of an edge of the conductive material, so that, within a frequency range, a frequency dependency of a magnetic field, which is induced by an alternating current flowing along the current direction, is reduced in comparison with a busbar having a central recess.
1. A busbar for current transport, comprising:
conductive material that extends along a current direction; and
a recess for a magnetic field sensor,
the recess extending into the conductive material,
a middle of the recess being shifted by a predetermined distance from a middle of the conductive material in a direction of an edge of the conductive material, and
the predetermined distance being based on a value configured to, within a frequency range, cause a frequency dependency of a magnetic field, which is induced in the recess by an alternating current flowing along the current direction, to be reduced in comparison to when the busbar is configured with a central recess.
2. The busbar as claimed in claim 1 , wherein the predetermined distance is more than 10 percent of a distance between the middle of the recess and the edge of the conductive material.
3. The busbar as claimed in claim 1 , wherein the recess extends fully through the conductive material.
4. The busbar as claimed in claim 1 , further comprising:
a further recess, which extends into the conductive material,
a middle of the further recess being shifted by the predetermined distance from a middle of the conductive material in a direction of an opposite edge of the conductive material, and
the opposite edge lying opposite the edge.
5. The busbar as claimed in claim 1 , wherein a cross section of the busbar at a position of the recess is reduced in comparison with a cross section of the busbar away from the recess by more than the cross section of the recess.
6. The busbar as claimed in claim 1 , wherein the busbar comprises a cross-sectional area perpendicular to the current direction which has a horizontal extent and a vertical extent, the middle of the recess being shifted in a horizontal direction and the recess extending in a vertical direction into the conductive material.
7. The busbar as claimed in claim 6 , wherein a cross section of the busbar is reduced in the vertical direction at a position of the recess.
8. The busbar as claimed in claim 6 , wherein a cross section of the busbar is reduced in the horizontal direction at a position of the recess.
9. The busbar as claimed in claim 6 , wherein a cross section of the busbar is reduced symmetrically.
10. The busbar as claimed in claim 6 , wherein the horizontal extent of the busbar in the horizontal direction is greater than the vertical extent of the busbar in the vertical direction.
11. The busbar as claimed in claim 1 , further comprising:
a magnetic field sensor, arranged in the recess, configured to be sensitive to magnetic field components perpendicular to the current direction.
12. The busbar as claimed in claim 11 , further comprising:
a further magnetic field sensor, arranged in the recess, configured to be sensitive to magnetic field components perpendicular to the current direction.
13. The busbar as claimed in claim 12 , wherein the magnetic field sensor and the further magnetic field sensor are arranged on different sides of a symmetry plane of the busbar.
14. A power module for generating supply power for an electrical load, comprising:
a current generating circuit configured to provide a supply voltage; and
the busbar according to claim 1 coupled to the current generating circuit.
15. The power module as claimed in claim 14 , further comprising:
a housing which contains the current generating circuit,
the recess in the busbar being arranged either inside or outside the housing.
16. The power module as claimed in claim 14 , wherein the current generating circuit is configured to provide an alternating voltage.
17. The busbar as claimed in claim 1 , wherein a cross section of the busbar at a position of the recess is reduced by one or more convex indentations towards the edge.
18. The busbar as claimed in claim 1 , further comprising:
a further recess;
a middle of the further recess being shifted by the predetermined distance from the middle of the conductive material; and
the magnetic field sensor, arranged in the recess, configured to be sensitive to magnetic field components perpendicular to the current direction.
19. The busbar as claimed in claim 18 , further comprising:
a further magnetic field sensor, arranged in the recess, configured to be sensitive to magnetic field components perpendicular to the current direction.
20. The busbar as claimed in claim 7 , wherein the cross section of the busbar at the position of the recess is reduced by one or more convex indentations towards the edge.