Magnetic Field Sensor Dynamic Angle Error Compensation
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Solution Overview
Problem
The accuracy of magnetic angle sensors is limited by the accuracy of the sensing element and is affected by temperature and lifetime drifts, making existing compensation methods like Look-Up Tables (LUTs) static and ineffective in dynamic conditions.
Innovation Solution
A magnetic field sensor system that combines at least one magnetoresistive sensor element with multiple Hall sensor elements, where the Hall sensor elements are oriented differently to generate correction signals for the magnetoresistive sensor signals, allowing for real-time compensation of angle errors across the entire angle range, including temperature and lifetime variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Look-Up Tables (LUTs) are used for angle error compensation, then measurement precision can be improved, but device complexity increases and adaptability to temperature and lifetime drifts deteriorates
Solution Approach 1:
The patent transitions from static LUT compensation to dynamic compensation by adding Hall sensor elements that continuously provide correction signals. The Hall sensors detect magnetic field variations caused by temperature and lifetime drifts in real-time, enabling the system to adapt dynamically to changing conditions rather than relying on pre-programmed static tables.
Solution Approach 2:
The patent implements feedback by using Hall sensor elements to continuously monitor magnetic field variations and provide correction signals to the magnetoresistive sensor output. This closed-loop feedback mechanism allows the system to automatically compensate for temperature and lifetime drifts as they occur, improving both precision and adaptability.
2Adaptability or versatility
If multiple Hall sensor elements with different orientations are added for real-time compensation, then adaptability to temperature and lifetime drifts is improved, but device complexity increases
Solution Approach 1:
The patent divides the compensation function into multiple independent Hall sensor elements, each oriented in different directions (e.g., 0°, 45°, 90°). Each sensor element handles a specific component of the magnetic field variation, allowing the system to decompose the complex compensation task into simpler, parallel measurements that can be processed independently.
Solution Approach 2:
The Hall sensor elements serve multiple functions: they detect magnetic field variations caused by temperature drifts, lifetime drifts, and positional variations. By using the same Hall sensor technology for multiple compensation purposes, the patent reduces overall system complexity compared to using separate specialized sensors for each function.
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
This approach enhances the accuracy of magnetic angle sensors by dynamically correcting for angle errors, improving precision and reducing the need for static LUTs, which are not adaptable to changes over time or temperature.
Implementation Method 1
Magnetoresistance is a property of a material to change the value of its electrical resistance when an external magnetic field is applied to it
Implementation Method 2
A Hall effect sensor is a transducer that varies its output voltage (Hall voltage) in response to a magnetic field. It is based on the Hall effect which makes use of the Lorentz force.
Implementation Method 3
The Lorentz force deflects moving charges in the presence of a magnetic field which is perpendicular to the current flow through the sensor or Hall plate
Data Source
AI summary
The present disclosure relates to a magnetic field sensor including a first magnetic field sensor element configured to generate a first sensor signal in response to a magnetic field; a second magnetic field sensor element configured to generate a second sensor signal in response to the magnetic field; and a compensation circuit configured to compensate the first sensor signal using the second sensor signal, wherein the compensation circuit is configured to apply a correction to the first sensor signal at least if the second sensor signal is indicative of an orientation of the magnetic field parallel or perpendicular to an orientation of the second magnetic field sensor element, and if the first sensor signal is indicative of a different orientation of the magnetic field.