Magnetic Sensing Device Quadrant Encoding
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Solution Overview
Problem
Magnetic angle sensors providing 180° absolute angle information, such as 180° AMR sensors, cannot differentiate between the first and second half turns of a 360° rotation, leading to increased complexity and cost due to the need for multiple electrical leads to distinguish quadrants.
Innovation Solution
A magnetic sensing device combining a 180° AMR angle sensor with a quadrant detector, where the quadrant information is encoded into the analog sine and cosine voltage outputs, allowing for 360° angle information to be derived with reduced electrical leads by modulating the angle sensor's output based on the quadrant detector's signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 180° AMR angle sensor is used to provide absolute angle information, then measurement precision is improved, but device complexity increases due to the need for multiple electrical leads to distinguish quadrants
Solution Approach 1:
The patent combines the 180° angle sensor and quadrant detector into a single integrated magnetic sensing device with a unified output signal. The quadrant information is encoded into the angle sensor outputs, merging two separate measurement functions into one device that requires fewer electrical leads while maintaining both precise angle measurement and quadrant differentiation capabilities
2Reliability
If a 180° AMR angle sensor is used, then reliability is improved through robust angle measurement, but loss of information occurs as the sensor cannot differentiate between first and second half turns
Solution Approach 1:
The patent introduces a quadrant detector as an intermediary component that works alongside the 180° angle sensor. The quadrant detector provides the missing quadrant information by detecting the magnetic field quadrant, which then encodes this information into the angle sensor outputs, allowing the system to maintain reliable angle measurement while recovering the lost quadrant differentiation capability
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 configuration provides precise 360° angle measurements with reduced complexity and cost by encoding quadrant information into the angle sensor's outputs, enabling differentiation between the first and second half turns without additional leads.
Implementation Method 1
Magnetic angle sensors such as magnetoresistive (MR) sensors are used to sense external rotating magnetic fields by detecting a change in resistance of the sensor as a result of the external magnetic field
Implementation Method 2
a magnetic angle sensor configured to provide 180° absolute angle measurements, such as a 180° anisotropic magnetoresistive (AMR) angle sensor
Data Source
AI summary
The present disclosure provides a method of providing quadrant information to a magnetic sensing device comprising a magnetic angle sensor, and in particular, a magnetic angle sensor configured to provide 180° absolute angle measurements, such as a 180° anisotropic magnetoresistive (AMR) angle sensor, such that the magnetic sensing device outputs an analog signal encoded with 360° information. In this respect, magnetic sensing device is provided with a magnetic angle sensor and a quadrant detector, which may be provided on the same substrate or two separate substrates, wherein the signal from the quadrant detector is encoded into the analog sine and cosine voltage outputs from the magnetic angle sensor such that the two analog outputs provide 360° angle information.