Hall Sensor Angle Measurement Error Compensation
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Solution Overview
Problem
Hall sensors are sensitive to interference fields caused by current-carrying cables and magnets, leading to falsified angle measurement values, particularly in applications like hybrid and electric vehicles where such interference is common.
Innovation Solution
The design incorporates additional Hall element pairs arranged at specific angles to combine measurement signals, allowing for the calculation and compensation of errors caused by external magnetic fields, thereby reducing sensitivity to interference and maintaining accuracy in angle measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional Hall element pairs are added to the sensor, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor is divided into multiple Hall element pairs (first pair at 0°, second pair at 90°, third pair at 45°) that independently measure magnetic field components. Each pair contributes to the overall measurement, allowing the system to distinguish between rotational magnetic fields and external interference fields through comparative analysis of the segmented measurements.
Solution Approach 2:
The patent transitions from a single measurement dimension to multiple angular dimensions by arranging Hall element pairs at different orientations (0°, 90°, 45°). This multi-dimensional measurement approach enables the system to detect and compensate for external magnetic field interference by analyzing the magnetic field components from multiple spatial perspectives.
2Reliability
If more Hall elements are used to compensate for external fields, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
Multiple Hall element pairs are merged into a single integrated sensor structure that shares common components such as the substrate, connection terminals, and signal processing circuitry. The Hall elements are arranged in a compact pattern where they can be manufactured simultaneously using standard semiconductor fabrication processes, reducing the overall manufacturing cost compared to separate sensors.
Solution Approach 2:
The additional Hall element pairs serve multiple functions: they provide redundant measurement data for improved reliability, enable discrimination between rotational and external magnetic fields, and allow for offset compensation. This multi-functionality justifies the increased component count by delivering multiple benefits from a single sensor design.
3Measurement precision
If Hall element pairs are arranged at offset angles, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The Hall element pairs are arranged asymmetrically at specific angles (0°, 90°, and 45°) rather than uniformly distributed. This asymmetric arrangement optimizes the sensor's ability to distinguish between rotational magnetic fields and external interference by creating unique measurement signatures for different field types, improving precision while maintaining a manageable structural complexity.
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 minimizes the impact of external magnetic fields on the overall measurement signal, ensuring more accurate angle detection and rotational speed measurements in vehicles without increasing costs, making it suitable for hybrid and electric vehicle applications.
Implementation Method 1
Hall sensors are used in many areas of technology. For example, Hall sensors can be used to detect rotational movements and, in particular, rotational angles without contact.
Implementation Method 2
The third pair of Hall elements is designed to provide a third measurement signal. The Hall element pairs can be controlled in such a way that the first measurement signal, the second measurement signal and the third measurement signal can be combined to form an overall measurement signal, which takes into account an error caused by an external magnetic field.
Data Source
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AI summary
The invention relates to a Hall sensor (1). The Hall sensor (1) has a first Hall element pair (5) which is designed to provide a first measurement signal (21). Furthermore, the Hall sensor (1) has a second Hall element pair (7) which is designed to provide a second measurement signal (23). Furthermore, the Hall sensor (1) has at least one third Hall element pair (9) which is designed to provide a third measurement signal (25). The Hall elements (3) of the third Hall element pair (9) are each arranged between Hall elements (3) of the first Hall element pair (5) and the second Hall element pair (7). The Hall element pairs (5, 7, 9) can be actuated such that the first measurement signal (21), the second measurement signal (23) and the third measurement signal (25) can be combined into one aggregate measurement signal, which corrects an error in the angle of rotation determination caused by an external magnetic field (19).