Integrated circuit arrangement for a position sensor using hall elements

Patent metadata

Field	Value
Publication number	US-10401193-B2
Application number	US-201615278251-A
Country	US
Kind code	B2
Filing date	Sep 28, 2016
Priority date	Sep 28, 2015
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

The invention relates to an integrated circuit arrangement for a position sensor for measuring angles or distances, wherein the circuit arrangement comprises:
a measurement substrate, which defines a measurement plane and which is configured such that it comprises a plurality of corners; at least three Hall elements, which are arranged on the measurement substrate such that areas of the Hall elements, which are sensitive to a magnetic field, extend in the measurement plane and/or form a part of the measurement plane, and that a virtual polygon, which is formed by the Hall elements, is rotated with respect to the measurement substrate such that the Hall elements are each located at an outer edge of the measurement substrate and have a distance to a center of an edge of the corresponding outer edge amounting to at maximum 25% of a total length of the corresponding outer edge, wherein the Hall elements are, in an intended use of the circuit arrangement during the measurement, configured to respectively output an output signal, which corresponds to a magnetic field strength of a magnet to be detected; and a processing electronic system, to which the output signals of the Hall sensors are delivered in the intended use of the circuit arrangement during the measurement.

First claim

The invention claimed is:

1. An integrated circuit arrangement for a position sensor for measuring angles of or distances to an object, the integrated circuit arrangement comprising:
a measurement substrate that defines a measurement plane and including a plurality of corners;
at least three Hall elements that are sensitive to a magnetic field and located on the measurement substrate such that areas of the at least three Hall elements extend in the measurement plane or form a part of the measurement plane, the at least three Hall elements forming a virtual polygon that is rotated with respect to the measurement substrate such that the at least three Hall elements are each located at an outer edge of the measurement substrate and such that each of the at least three Hall elements is located a distance from a center of a corresponding outer edge of the measurement substrate, the distance amounting to no more than 25% of a total length of the corresponding outer edge, wherein
the at least three Hall elements are configured to respectively output an output signal that corresponds to a magnetic field strength of a magnet;
a processing electronic system that receives the output signals and measures the angles or distances; and
two additional Hall elements located at opposing corners of the measurement substrate to sense rotations of the magnet,
wherein the at least three Hall elements each have a polygonal shape and are rotated with respect to the corresponding outer edges such that a corner of a respective Hall element is facing the corresponding outer edge.

2. The integrated circuit arrangement according to claim 1 , wherein a shortest distance between each of the at least three Hall elements and the corresponding outer edge is less than or equal to 300 μm.

3. The integrated circuit arrangement according to claim 2 , wherein the shortest distance to the corresponding outer edge runs between the facing corner and the corresponding outer edge.

4. The integrated circuit arrangement according to claim 3 , wherein the at least three Hall elements are rotated with respect to the corresponding outer edge such that a line that connects two corners of the polygonal shape is perpendicular to the corresponding outer edge.

5. The integrated circuit arrangement according to claim 1 , wherein a number of the corners of the measurement substrate is identical to a number of corners of the virtual polygon.

6. The integrated circuit arrangement according to claim 1 , wherein the virtual polygon is a regular polygon.

7. The integrated circuit arrangement according to claim 1 , wherein each of the at least three Hall elements is located at the center of the corresponding outer edge.

8. The integrated circuit arrangement according to claim 1 , wherein the measurement substrate and the virtual polygon each have a triangular shape, and the at least three Hall sensors are each arranged on a median line of the corresponding outer edge of the triangular measurement substrate.

9. The integrated circuit arrangement according to claim 1 , wherein the at least three Hall elements include four Hall elements, wherein the measurement substrate and the virtual polygon each have a quadrangular shape, and the at least three Hall elements are each arranged at the center of the corresponding outer edge of the quadrangular measurement substrate.

10. The integrated circuit arrangement according to claim 1 , wherein:
the processing electronic system comprises one single multiplexer and at least one amplifier; and
the multiplexer is configured to selectively output the output signals of the at least three Hall elements to the at least one amplifier.

11. A position sensor comprising:
an integrated circuit arrangement including:
a measurement substrate that defines a measurement plane and including a plurality of corners;
at least three Hall elements that are sensitive to a magnetic field and located on the measurement substrate such that areas of the at least three Hall elements extend in the measurement plane or form a part of the measurement plane, the at least three Hall elements forming a virtual polygon that is rotated with respect to the measurement substrate such that the at least three Hall elements are each located at an outer edge of the measurement substrate and such that each of the at least three Hall elements is located a distance from a center of a corresponding outer edge of the measurement substrate the distance amounting to no more than 25% of a total length of the corresponding outer edge, wherein the at least three Hall elements are configured to respectively output an output signal that corresponds to a magnetic field strength;
a processing electronic system that receives the output signals and measures angles of or distances to an object; and
two additional Hall elements located at opposing corners of the measurement substrate;

a magnet movable in a movement plane relative to the integrated circuit arrangement, the movement plane running parallel to the measurement plane and which is movable relative to the integrated circuit arrangement, wherein the two additional Hall elements sense rotations of the magnet; and
a controller connected to an amplifier such that the amplifier outputs an amplified output signal to the controller, the controller including a demultiplexer configured to receive the amplified output signal to output of a plurality of outputs; wherein the controller is configured to calculate a posture of the magnet on a basis of the plurality of outputs, wherein the integrated circuit arrangement includes:
a Wiegand module that generates voltage pulses based on the rotations of the magnet;
a rectifier coupled to the Wiegand module that rectifies the voltage pulses; and
a capacitance coupled between the rectifier and the two additional Hall elements and that stores charge according to the rectified voltage pulses to supply power to the two additional Hall elements.

12. The position sensor according to claim 11 , wherein a shortest distance between each of the at least three Hall elements and the corresponding outer edge is less than or equal to 300 μm.

13. The position sensor according to claim 12 , wherein the at least three Hall elements each have a polygonal shape and are rotated with respect to the corresponding outer edges such that a corner of a respective Hall element is facing the corresponding outer edge and that the shortest distance to the corresponding outer edge runs between the facing corner and the outer edge.

14. The position sensor according to claim 13 , wherein the at least three Hall elements are rotated with respect to the corresponding outer edge such that a line that connects two corners of the polygonal shape is perpendicular to the corresponding outer edge.

15. The position sensor according to claim 11 , wherein a number of the corners of the measurement substrate is identical to a number of corners of the virtual polygon.

16. The position sensor according to claim 11 , wherein the virtual polygon is a regular polygon.

17. The position sensor according to claim 11 , wherein each of the at least three Hall elements is located at the center of the corresponding outer edge.

18. The position sensor according to claim 11 , wherein the measurement substrate and the virtual polygon each have a triangular shape, and the at least three Hall sensors are each arranged on a median line of the corresponding outer edge of the triangular measurement substrate.

19. The position sensor according to claim 11 , wherein the at least t

Assignees

• Avago Tech Int Sales Pte Lid

Inventors

• Mehnert Walter
• Theil Thomas

Classifications

• G01D5/145 Primary

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title