Magnetic Sensor Misalignment Compensation via Field Conversion
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Solution Overview
Problem
Existing magnetic sensors face challenges in detecting magnetic fields perpendicular to the substrate plane due to misalignment between magnetic detection elements and soft magnetic materials, leading to variations in output signals and conversion efficiency.
Innovation Solution
A magnetic sensor design incorporating a magnetic field conversion unit and detection unit, where the magnetic field conversion unit uses a soft magnetic material to convert input magnetic fields and the detection unit comprises magnetoresistive elements positioned to minimize the impact of misalignment, ensuring stable output signals across varying magnetic field directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a soft magnetic material is used to convert vertical magnetic field component into horizontal magnetic field component, then the magnetic sensor can detect magnetic fields perpendicular to the substrate plane, but misalignment between the magnetic detection element and the soft magnetic material causes large variation in conversion efficiency and output signals
Solution Approach 1:
The magnetic detection element is divided into multiple magnetoresistive elements arranged in a specific pattern (e.g., bridge circuit configuration). This segmentation allows the system to detect both in-plane and out-of-plane magnetic field components while compensating for misalignment effects through differential measurement techniques.
Solution Approach 2:
The soft magnetic material is designed with specific local geometric features (e.g., tapered shape, optimized thickness distribution) that create a controlled magnetic field distribution. This local optimization ensures that even with misalignment, the magnetic field conversion efficiency remains stable across different detection positions.
2Measurement precision
If the magnetic detection element is positioned to maximize sensitivity in one direction, then detection capability in that direction is improved, but detection capability in other directions deteriorates
Solution Approach 1:
The magnetic sensor design enables a single magnetoresistive element structure to perform multiple detection functions - detecting both in-plane magnetic fields (parallel to substrate) and out-of-plane magnetic fields (perpendicular to substrate). This is achieved through the combination of direct magnetic field sensing and soft magnetic material-mediated field conversion, allowing one device to replace multiple specialized sensors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively detects magnetic fields in directions other than the sensor's primary sensitivity, reducing signal variations caused by misalignment and enhancing the stability of output signals.
Implementation Method 1
a soft magnetic material for converting a vertical magnetic field component perpendicular to the plane of the substrate into a horizontal magnetic field component parallel to the plane of the substrate
Implementation Method 2
The magnetic detection elements may be magnetoresistive elements, for example
Data Source
AI summary
A magnetic sensor includes a magnetic field conversion unit and a magnetic field detection unit. The magnetic field conversion unit receives an input magnetic field containing an input magnetic field component in a direction parallel to Z direction, and generates an output magnetic field containing an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit receives the output magmetic field and generates an output signal corresponding to the input magnetic field component. The magnetic field detection unit includes first and second magnetic detection elements. When misalignment occurs between the magnetic field conversion unit and the magnetic field detection unit, one of the strength of a portion of the output magnetic field component that the first magnetic detection element receives and the strength of a portion of the output magnetic field component that the second magnetic detection element receives increases while the other decreases.