Position Sensing System Using Differential Signal Correction
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Solution Overview
Problem
In position sensing systems, environmental factors such as ambient temperature and magnetic field angles significantly affect the accuracy of position sensing elements, particularly when aiming for micron-level precision.
Innovation Solution
A position sensing system comprising a signal processing module, a first position sensing element, and at least one second position sensing element, where the first position sensing signal is used to correct the second position sensing signal using a predetermined equation, thereby eliminating environmental impacts and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single position sensing element is used to achieve micron-level measurement accuracy, then the measurement precision is improved, but the sensing accuracy is adversely affected by environmental changes
Solution Approach 1:
The sensing system is divided into multiple independent sensing elements (first position sensing element and second position sensing element) that operate in parallel. Each element provides a sensing signal that is processed independently, allowing the system to segment the environmental impact and correct it through differential processing.
Solution Approach 2:
The system implements feedback by using the first position sensing signal to correct the second position sensing signal. The correction process continuously adjusts the second sensing signal based on the environmental effects detected by the first sensing element, creating a closed-loop system that compensates for environmental disturbances.
2Reliability
If multiple position sensing elements are used to eliminate environmental effects, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Multiple sensing elements and their processing circuits are merged into an integrated signal processing module. The first and second position sensing elements, along with their respective signal processing circuits, are combined in a single module that performs differential processing, reducing the overall system complexity despite using multiple sensing elements.
Solution Approach 2:
The signal processing module serves multiple functions: it processes signals from both the first and second position sensing elements, performs differential correction to eliminate environmental effects, and outputs the corrected position information. This multi-functionality reduces the need for separate correction circuits and simplifies the overall system architecture.
Data Source
AI summary
A position sensing system, a method for acquiring a position sensing signal and an electronic device are provided. The position sensing system is provided with a first position sensing element and at least one second position sensing element. A first position sensing signal outputted by the first position sensing element in response to a predetermined signal is used as a correction signal for a second position sensing signal outputted by the second position sensing element, and the signal processing module corrects the second position sensing signal outputted by at least one of the second position sensing element based on the first position sensing signal and determines a target sensing signal based on at least one corrected second position sensing signal.