Magnetic Field Sensor Angular Resolution via Phase-Separated Signal Processing
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Solution Overview
Problem
Magnetic field sensors face limitations in achieving high angular resolution, requiring additional sensors or complex targets, which increase size, cost, and manufacturing complexity.
Innovation Solution
A method involving the generation of first and second magnetic field signals with a predetermined phase difference, used to create an angle signal that is compared to thresholds to generate output transitions, allowing for higher resolution angular detection without increasing complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors in different physical locations are used to increase angular resolution, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the magnetic field detection into multiple processing channels (first and second processing channels) that process signals from the same sensing elements differently. Each channel generates phase-separated signals through different computational paths, enabling high-resolution angular detection without adding physical sensors. This segmentation of signal processing replaces physical segmentation of sensors.
Solution Approach 2:
The patent creates virtual copies of magnetic field signals through mathematical transformations. By generating phase-separated signals computationally from the same physical sensor outputs, the system creates multiple signal representations that mimic what additional physical sensors would produce, eliminating the need for extra hardware while achieving the same measurement precision.
2Measurement precision
If more sensing components are used to achieve higher angular resolution, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes the existing magnetic field sensing elements perform multiple functions by processing their outputs through different computational channels. The same physical sensors generate both the first and second processing channel signals, allowing one set of sensing components to serve the dual purpose of basic detection and high-resolution angular measurement, thereby reducing manufacturing costs.
Solution Approach 2:
The patent changes the parameter of signal phase separation through mathematical processing rather than physical sensor arrangement. By applying different computational transformations to the sensor outputs, the system achieves angular resolution enhancement without changing the physical configuration or quantity of sensing components, thus maintaining cost-effectiveness.
3Measurement precision
If complex targets are used to increase angular resolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical approach of using complex physical targets with a computational approach. Instead of requiring mechanically complex target structures to achieve phase separation, the system uses mathematical processing to generate phase-separated signals from simple sensor outputs, substituting mechanical complexity with algorithmic processing.
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 angular resolution and accuracy by generating multiple output transitions per pole-pair, improving the sensor's ability to detect the angle and direction of rotation with reduced complexity and cost.
Implementation Method 1
a first magnetic field sensing element and a second magnetic field sensing element that generate respective magnetic field signals indicative of a magnetic field affected by an object
Data Source
AI summary
A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other and a controller responsive to the at least two measured magnetic field signals. The controller is configured to generate an angle signal and to compare the angle signal to at least one angle signal threshold. The angle signal can be compared to a plurality of angle signal thresholds to generate a plurality of output transitions, each output transitions indicative of the angle signal crossing the corresponding angle signal threshold. The number of angle signal thresholds can be dependent upon a desired number of output transitions per pole-pair of the angle signal.