Stacked Hall Effect Sensors for Magnetic Field Direction Detection
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Solution Overview
Problem
Hall Effect sensors cannot determine the direction of a magnetic field, limiting their ability to accurately locate a magnet relative to the sensor, as they only provide voltage output based on magnetic field strength without directional information.
Innovation Solution
A sensor system comprising a first and second magnetic sensor stacked a distance apart, generating detection signals based on magnetic field values, with a comparator determining the direction of the magnetic field by comparing these signals, leveraging the inverse variation of magnetic field strength with distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single Hall Effect sensor is used to detect magnetic field strength, then the sensor can determine distance from the magnet, but it cannot determine the direction of the magnetic field
Solution Approach 1:
The system divides the detection function into multiple Hall Effect sensors positioned at different locations (e.g., opposite sides of a substrate). Each sensor independently measures magnetic field strength, and the controller compares these segmented measurements to determine directional information, thereby resolving the contradiction between enhanced measurement precision and device complexity.
Solution Approach 2:
The patent combines multiple Hall Effect sensors with a controller into an integrated system. The sensors are positioned on opposite sides of a substrate, and their outputs are merged through the controller which compares the signals to determine both distance and direction, achieving comprehensive magnetic field characterization without requiring overly complex individual sensor designs.
2Loss of information
If multiple magnetic sensors are stacked a distance apart to determine field direction, then directional information can be obtained, but the device complexity increases
Solution Approach 1:
The system transitions from single-point detection to multi-point detection by stacking sensors at different positions along the magnetic field gradient. This dimensional expansion allows the system to capture spatial variations in field strength, enabling direction determination through comparison of signals from sensors at different locations.
Solution Approach 2:
The controller serves as an intermediary that receives signals from multiple Hall Effect sensors, processes the differential measurements, and extracts directional information. This intermediary component simplifies the overall system architecture by centralizing the complex comparison and decision-making logic, rather than requiring complex wiring or direct sensor-to-sensor interaction.
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
Enables the determination of the magnetic field direction, allowing for precise location of a magnetic source relative to the sensor system, enhancing applications such as proximity sensing and near-field communication.
Implementation Method 1
A Hall Effect sensor is a transducer that varies its output voltage in response to a magnetic field
Implementation Method 2
magnetic field strength varies inversely with distance
Data Source
AI summary
An integrated system of sensors that can be used to detect a direction of an externally applied magnetic field is disclosed. In one embodiment, the system can be incorporated into a compact package that can be used within an electronic device. A processor can use signals provided by the sensor system to provide an indication of the direction of the externally applied magnetic field. In one embodiment, the sensors can take the form of analog sensors such as Hall Effect sensors configured in such a way that the direction of the externally applied magnetic field can be deduced based in part upon detection signals provided by the Hall Effect sensors. In one embodiment, the Hall Effect sensors can be stacked one atop the other in such a way that relative signal strength of the detection signals from the sensors can indicate the direction of the externally applied magnetic field.