Compensating a harmonic

Patent metadata

Field	Value
Publication number	US-2024118354-A1
Application number	US-202318376886-A
Country	US
Kind code	A1
Filing date	Oct 5, 2023
Priority date	Oct 6, 2022
Publication date	Apr 11, 2024
Grant date	—

Abstract

A device and a method for compensating a harmonic in an output voltage of at least one xMR sensor assembly is provided. The device includes the at least one xMR sensor assembly including at least one magnetoresistive element, at least one excitation magnet, at least one demodulation unit, a scaling unit and a superposing unit. The method includes detecting the output voltage of the at least one xMR sensor assembly in a demodulation unit, converting the output voltage of the at least one xMR sensor assembly in the demodulation unit, generating a compensation voltage from the demodulation voltage in a scaling unit, and superposing the compensation voltage with the output voltage of the at least one xMR sensor assembly in a superposing unit.

First claim

1 . A method for compensating a harmonic in an output voltage of at least one xMR sensor assembly by a scaling unit, the method comprising:
detecting the output voltage of the at least one xMR sensor assembly in a demodulation unit, wherein the at least one xMR sensor assembly comprises at least one magnetoresistive element; converting the output voltage of the at least one xMR sensor assembly in the demodulation unit, wherein the converting comprises generating a demodulation voltage; generating a compensation voltage from the demodulation voltage in the scaling unit, wherein the generating of the compensation voltage is performed using a scaling parameter; and compensating the harmonic by superposing the compensation voltage with the output voltage of the at least one xMR sensor assembly in a superposing unit.

2 . The method of claim 1 , further comprising:
determining the scaling parameter.

3 . The method according to claim 2 , wherein:
the determining of the scaling parameter is performed using an amplitude unit.

4 . The method according to claim 2 , wherein:
the determining of the scaling parameter comprises comparing a first magnetic field strength detected by a first Hall sensor and a second magnetic field strength detected by a second Hall sensor.

5 . The method according to claim 2 , wherein:
the determining of the scaling parameter comprises comparing a first magnetic field strength detected by a first Hall sensor or a second magnetic field strength detected by a second Hall sensor.

6 . The method according to claim 3 , wherein:
the determining of the scaling parameter comprises comparing a first magnetic field strength detected by a first Hall sensor and a second magnetic field strength detected by a second Hall sensor.

7 . The method according to claim 3 , wherein:
the determining of the scaling parameter comprises comparing a first magnetic field strength detected by a first Hall sensor or a second magnetic field strength detected by a second Hall sensor.

8 . The method according to claim 2 , wherein:
the determining of the scaling parameter is performed using the temperature unit, wherein the determining of the scaling parameter comprises determining a temperature of at least one of the at least one xMR sensor assembly.

9 . The method according to claim 8 , wherein:
the determining of the temperature of at least one of the at least one xMR sensor assembly comprises sensing a temperature of the magnetoresistive element, wherein the detecting of the temperature of the magnetoresistive element comprises detecting a temperature of at least one of a barrier layer, a fixed layer or a free layer of the magnetoresistive element.

10 . A method for compensating a harmonic in an output voltage of at least one xMR sensor assembly, the method comprising:
detecting the output voltage of the at least one xMR sensor assembly in a demodulation unit, wherein the at least one xMR sensor assembly comprises at least one magnetoresistive element; converting the output voltage of the at least one xMR sensor assembly in the demodulation unit, wherein the converting comprises generating a demodulation voltage; and compensating the harmonic by superposing the demodulation voltage with the output voltage of the at least one xMR sensor assembly in a superposing unit.

11 . A device for compensating a harmonic in an output voltage of at least one xMR sensor assembly, the device comprising:
the at least one xMR sensor assembly comprising at least one magnetoresistive element, wherein the at least one magnetoresistive element comprises a barrier layer, a fixed layer, and a free layer, and wherein the barrier layer is arranged between the free layer and the fixed layer, and wherein the at least one xMR sensor assembly has the output voltage; at least one excitation magnet; at least one demodulation unit electrically connected to the at least one xMR sensor assembly, wherein the demodulation unit is arranged to generate a demodulation voltage by converting the output voltage of the at least one xMR sensor assembly; a scaling unit electrically connected to the demodulation unit, the scaling unit being arranged to generate a compensation voltage using a scaling parameter; and a superposing unit electrically connected to the at least one xMR sensor assembly and the scaling unit, wherein the superposing unit is arranged to superpose the compensation voltage with the output voltage of the at least one xMR sensor assembly.

12 . The device according to claim 11 , wherein
the barrier layer, the fixed layer, and the free layer are arranged along an axis; and the excitation magnet is arranged along the axis.

13 . The device according to claim 11 , wherein
the fixed layer comprises a ferromagnet.

14 . The device according to claim 11 , in which
the free layer comprises a permanent magnet.

15 . The device according to claim 11 , in which
the excitation magnet is arranged rotatable about an axis relative to the at least one xMR sensor assembly.

16 . The device according to claim 11 , wherein
the at least one demodulation unit comprises a plurality of separate demodulation units.

17 . The device according to claim 11 , wherein
the scaling parameter is fixedly defined.

18 . The device according to claim 11 , in which
the scaling parameter is variable, and the scaling unit determines the scaling parameter using at least one of an amplitude unit and a temperature unit.

19 . The device according to claim 11 , wherein
the amplitude unit comprises at least a first Hall sensor and a second Hall sensor.

20 . A device for compensating a harmonic in an output voltage of at least one xMR sensor assembly, the device comprising:
the at least one xMR sensor assembly comprising at least one magnetoresistive element, wherein the at least one magnetoresistive element comprises a barrier layer, a fixed layer, and a free layer, and wherein the barrier layer is arranged between the free layer and the fixed layer, and wherein the at least one xMR sensor assembly has the output voltage; at least one excitation magnet; at least one demodulation logic logically connected to the at least one xMR sensor assembly, wherein the demodulation logic is arranged to generate a demodulation voltage by converting the output voltage of the at least one xMR sensor assembly; a scaling logic logically connected to the demodulation logic, the scaling logic being arranged to generate a compensation voltage using a scaling parameter; and a superposing logic logically connected to the at least one xMR sensor assembly and the scaling logic, wherein the superposing logic is arranged to superpose the compensation voltage with the output voltage of the at least one xMR sensor assembly.

21 . A computer-implemented method for compensating a harmonic in an output voltage of at least one xMR sensor assembly by a scaling logic, the computer-implemented method comprising:
detecting the output voltage of the at least one xMR sensor assembly in a demodulation logic, wherein the at least one xMR sensor assembly comprises at least one magnetoresistive element; converting the output voltage of the at least one xMR sensor assembly in the demodulation logic, wherein the converting comprises generating a demodulation voltage; generating a compensation voltage from the demodulation voltage in the scaling unit, wherein the generating of the compensation voltage is performed using a scaling parameter; a

Assignees

• Tdk Micronas Gmbh

Inventors

• Franke Jörg
• Muthers David

Classifications

• G01R33/093 Primary

  using multilayer structures, e.g. giant magnetoresistance sensors (thin magnetic films H01F10/00) · CPC title

• G01R33/09 Primary

  Magnetoresistive devices · CPC title

• G01R33/0082

  Compensation, e.g. compensating for temperature changes · CPC title