Method and sensor device for position detection

By measuring the 3D magnetic field vector generated by the magnet and calculating the displacement, the problem of determining the position of the magnetic field sensor in the plane is solved, fast and accurate position positioning is achieved, and the efficiency of related applications is improved.

CN120194594APending Publication Date: 2025-06-24INFINEON TECHNOLOGIES AG
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Patent Information

Application Number
CN202411879661.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-12-23
Filing Date
2024-12-19
Publication Date
2025-06-24

AI Technical Summary

Technical Problem

The prior art is difficult to quickly and accurately determine the position of the magnetic field sensor in the plane, affecting the efficiency of applications such as autonomous robot wireless charging and automotive headlight alignment.

Method used

The 3D magnetic field vector of the magnetic field generated by the magnet is measured by a magnetic field sensor, and the first displacement between the magnetic field sensor and the magnet is determined based on the first magnetic field component and the third magnetic field component, and the second displacement is determined based on the second magnetic field component and the third magnetic field component, thereby determining the position of the magnetic field sensor in the plane.

Benefits of technology

The rapid and accurate determination of the position of the magnetic field sensor in the plane is achieved, improving the efficiency of applications such as wireless charging and headlight alignment, simplifying calculation steps and reducing calibration requirements.

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Abstract

The invention relates to a method and a sensor device for position detection. A method for determining a position of a magnetic field sensor in a plane defined by a first direction and a second direction perpendicular to the first direction includes the action of measuring, by the magnetic field sensor, a 3D magnetic field vector of a magnetic field generated by a magnet separated from the plane by an air gap, wherein the 3D magnetic field vector includes a first magnetic field component in a first direction, a second magnetic field component in a second direction, and a third magnetic field component in a third direction perpendicular to the first and second directions. The method also includes an action of determining a first displacement between the magnetic field sensor and the magnet in the first direction based on a first magnetic field component and a third magnetic field component. The method also includes an action of determining a second displacement in a second direction between the magnetic field sensor and the magnet based on a second magnetic field component and a third magnetic field component.
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