Magnetic Sensor Offset Correction With Additional-Field Sensitivity
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Solution Overview
Problem
Magnetic sensors requiring complex computations to correct detection signals for multiple components increase processor load, particularly in systems with three-directional magnetic field detection.
Innovation Solution
A magnetic sensor device with a magnetic field generator and processor that generates additional magnetic fields to measure sensitivity, allowing for simplified correction of detection signals using first and second sensitivities based on these fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex computation is used to correct offsets of detection signals for three-directional magnetic field detection, then measurement precision is improved, but processor load increases
Solution Approach 1:
The patent changes the parameters used for offset correction by introducing sensitivity values obtained from additional magnetic fields. Instead of using complex multi-parameter computations, the system uses detection signals combined with sensitivity values (first sensitivity and second sensitivity) that are pre-obtained through controlled magnetic field application. This parameter substitution simplifies the correction computation while maintaining accuracy.
Solution Approach 2:
The patent applies preliminary action by pre-obtaining sensitivity values through controlled application of additional magnetic fields before actual detection. The processor generates first sensitivity and second sensitivity values by applying additional magnetic fields in specific directions and measuring the resulting detection signal changes. These pre-computed sensitivity values are then stored and used during normal operation to correct offsets, avoiding the need for complex real-time computations.
2Measurement precision
If additional magnetic fields are applied to measure sensitivity, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the magnetic field generator to serve multiple functions: it generates additional magnetic fields for sensitivity measurement during calibration, and the same sensitivity values obtained during this process are then used for offset correction during normal detection operations. This multi-functionality justifies the added device complexity by providing dual benefits from the additional magnetic field generation capability.
Solution Approach 2:
The patent uses an intermediary approach by introducing additional magnetic fields as a mediator to obtain sensitivity values. These additional magnetic fields act as a intermediary means to characterize the magnetic sensor's response characteristics. The sensitivity values derived from this intermediary measurement process are then used to correct detection signals, effectively using the additional magnetic fields as a calibration intermediary rather than a permanent part of the detection system.
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
Reduces detection errors in magnetic sensors by correcting offsets and sensitivity changes through a simple method, minimizing processor load and improving accuracy.
Implementation Method 1
a magnetic sensor configured to detect a component of a magnetic field and generate a detection signal
Implementation Method 2
a magnetic field generator configured to generate an additional magnetic field to measure sensitivity of the magnetic sensor in a direction of the component of the magnetic field
Data Source
AI summary
A magnetic sensor device includes a magnetic sensor, a magnetic field generator, and a processor. The processor generates first sensitivity that indicates sensitivity of the magnetic sensor when a strength of an additional magnetic field is changed in a first range, generates second sensitivity that indicates sensitivity of the magnetic sensor when the strength of the additional magnetic field is changed in a second range, and generates a detection value corresponding to a component of a magnetic field, based on a detection signal, the first sensitivity, and the second sensitivity.