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Detect discrete positional relationships between magnetic field transmitters and magnetic field sensor devices

A magnetic field sensor, a technology for detecting magnetic fields, applied in measurement devices, electromagnetic measurement devices, electromagnetic/magnetic position measurement, etc., can solve the problems of no differential measurement, no scattered field suppression, etc., and achieve low-cost effects

Active Publication Date: 2022-08-02
INFINEON TECH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such redundant sensors generally do not provide fringe field suppression because there is no differential measurement

Method used

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  • Detect discrete positional relationships between magnetic field transmitters and magnetic field sensor devices
  • Detect discrete positional relationships between magnetic field transmitters and magnetic field sensor devices
  • Detect discrete positional relationships between magnetic field transmitters and magnetic field sensor devices

Examples

Experimental program
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Embodiment Construction

[0026] figure 1 A system with a magnetic field transmitter 10 , a magnetic field sensor arrangement 12 and a device 14 for determining the positional relationship between the magnetic field 10 and the magnetic field sensor arrangement 12 is schematically shown. The device 14 has a processing circuit 15 . Examples of the present disclosure relate to apparatus 14 having processing circuitry 15 but not having magnetic field sensor arrangement 12 and magnetic field transmitter 10 . Examples of the present disclosure relate to devices or systems formed by the combination of processing device 15 and magnetic field sensor device 12 . Examples of the present disclosure relate to an apparatus or system formed by the combination of the processing apparatus 15 , the magnetic field sensor apparatus 12 , and the magnetic field transmitter 10 .

[0027] The magnetic field sensor arrangement 12 has at least three magnetic field sensors 16 , 18 , 20 . The magnetic field sensors 16, 18, 20 ...

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Abstract

Different discrete positional relationships can be generated by relative movement between the device consisting of at least three magnetic field sensors and the magnetic field transmitter. The at least three magnetic field sensors generate at least three sensor signals in response to the magnetic field generated by the magnetic field transmitter. The first signal is calculated as a first linear combination using at least two of the at least three sensor signals. It is checked whether the first signal unambiguously represents one of the different discrete positional relationships. If so, it is determined that the device is in such a discrete positional relationship with the magnetic field transmitter. If not, the second signal is calculated as a second linear combination using at least two of the at least three sensor signals, wherein the at least one sensor signal used to calculate the second signal is different from the sensor used to calculate the first signal signal, and at least the second signal is used to determine which of the different discrete positional relationships the device is in relative to the magnetic field transmitter.

Description

technical field [0001] The present disclosure relates to apparatus and methods for detecting the positional relationship between a magnetic field transmitter and a magnetic field sensor arrangement having at least three magnetic field sensors. In particular, the present disclosure relates to apparatus and methods capable of determining which of a plurality of discrete positional relationships a magnetic field sensor device is in. Background technique [0002] Magnetic field sensors are used to measure magnetic fields. An example of a magnetic field sensor is a Hall sensor device that provides an output signal proportional to the applied magnetic field. Other examples of magnetic field sensors are sensors based on the magnetoresistive effect, such as AMR sensors (AMR=Anisotropic Magnetoresistive Effect), GMR Sensors (GMR=Giant Magnetoresistive Effect), CMR Sensors (CMR=Super Giant Magnetoresistive Effect) or TMR sensor (TMR = Tunneling Magnetoresistive). [0003] For safet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/00G01R33/02
CPCG01B7/003G01R33/02G01R33/0206G01D5/145G01D3/08G01D5/16
Inventor D·哈默施密特R·赫尔曼
Owner INFINEON TECH AG