Magnetic Sensor Signal Processing Circuit Cross-Axis Correction
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Solution Overview
Problem
Conventional magnetic sensor systems require a dedicated magnetic field and interrupt normal operation to determine cross-axis sensitivity correction parameters, leading to inefficiencies and operational disruptions.
Innovation Solution
A signal processing circuit that processes detection signals from multiple magnetic sensors to determine a correction function using a coefficient matrix, allowing for cross-axis sensitivity correction without a dedicated magnetic field and without interrupting normal sensor operation, by defining provisional correction coefficients and minimizing measurement value errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cross-axis sensitivity correction techniques are used, then correction parameters can be determined, but a dedicated magnetic field device is needed and normal operation must be interrupted
Solution Approach 1:
The magnetic sensor device performs multiple functions: it detects magnetic fields during normal operation and simultaneously collects data for cross-axis sensitivity correction. The same sensors and processing circuitry used for regular detection are reused for correction parameter determination, eliminating the need for dedicated correction hardware.
Solution Approach 2:
Correction parameters are determined continuously or periodically during normal operation rather than requiring a separate calibration step. The system proactively collects detection signals and computes correction parameters in advance or in real-time, so correction is already available when needed without interrupting operation.
2Measurement precision
If conventional cross-axis sensitivity correction techniques are used, then correction parameters can be determined, but normal operation of magnetic sensors must be interrupted
Solution Approach 1:
The magnetic sensors continue to detect magnetic fields continuously without interruption. The signal processing circuit simultaneously processes these continuous detection signals to determine correction parameters, ensuring that both normal detection functionality and correction parameter determination occur without interruption to either.
Solution Approach 2:
Correction parameters are determined continuously or periodically during normal operation rather than requiring a separate calibration step. The system proactively collects detection signals and computes correction parameters in advance or in real-time, so correction is already available when needed without interrupting operation.
3Measurement precision
If cross-axis sensitivity correction is implemented, then detection accuracy improves, but processing complexity increases
Solution Approach 1:
The signal processing circuit merges the correction parameter determination function with the existing detection signal processing. By combining these functions in a single integrated circuit rather than adding separate correction hardware, the patent achieves correction capability while minimizing the increase in overall system complexity.
Solution Approach 2:
The magnetic sensor device performs its own self-correction by determining correction parameters internally using its own detection signals. The signal processing circuit automatically computes correction parameters from the collected data and applies them to correct detection signals, enabling the system to self-correct without external intervention or complex external correction systems.
Data Source
AI summary
A signal processing circuit includes a correction function determination section for performing correction function determination processing, and a correction processing section for performing correction processing. The correction processing is to correct first and second detection signals by using a correction function to thereby generate first and second corrected signals. The correction function is expressed as a coefficient matrix for converting a first column vector containing the first and second detection signals as elements into a second column vector containing the first and second corrected signals as elements. The correction function determination processing includes performing arithmetic processing using a plurality of pairs of values of the first and second detection signals to determine one or two provisional correction coefficients as the correction coefficients of the correction function.