Magnetic Sensor Device With Dual-Circuit Error Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic sensors without a soft magnetic body for shielding are prone to sensitivity changes due to magnetic fields in directions other than the intended detection, leading to reduced detection accuracy.
Innovation Solution
A magnetic sensor device comprising a first detection circuit for detecting a magnetic field in one direction, a second detection circuit for detecting a magnetic field in another direction, and a processor that executes generation, correction, and determination processing to reduce errors from magnetic fields other than the intended direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a soft magnetic body is added for shielding, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by using the second detection circuit to detect magnetic fields in unintended directions and feeding this information back to correct the first detection circuit's output. The processor uses the second detection signal to generate correction values that are applied to the first detection signal, thereby eliminating interference without requiring additional shielding structures.
Solution Approach 2:
The patent introduces a second detection circuit as an intermediary that detects magnetic fields in unintended directions. This intermediary circuit enables the system to identify and correct interference from unwanted magnetic field components, achieving accurate detection without physical shielding structures.
2Device complexity
If magnetoresistive elements are located on inclined surfaces, then device complexity is reduced, but detection accuracy deteriorates due to sensitivity changes from unintended magnetic fields
Solution Approach 1:
The patent uses feedback to compensate for the sensitivity changes caused by positioning magnetoresistive elements on inclined surfaces. The second detection circuit continuously monitors magnetic fields in unintended directions, and the processor applies correction values to the first detection circuit's output, maintaining detection accuracy without requiring complex shielding structures.
Solution Approach 2:
The patent replaces the mechanical approach of using physical shielding structures (soft magnetic bodies) with a signal processing approach. By using electronic correction based on second detection signals, the system achieves the same interference rejection that would otherwise require additional magnetic shielding components.
3Measurement precision
If correction processing is executed for both detection circuits, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent implements continuous correction processing where the processor alternately executes first and second correction processing in a continuous loop. This ensures that detection accuracy is maintained at all times without significant processing delays, as the correction is continuously updated based on the latest detection signals.
Solution Approach 2:
The patent uses periodic action by alternately executing first correction processing and second correction processing in a repeating cycle. This periodic execution of correction algorithms maintains detection accuracy while managing processing time through efficient alternation between correcting the first and second detection circuits.
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
The processor's alternating execution of correction processing for both detection circuits effectively reduces errors due to magnetic fields in unintended directions, enhancing the detection accuracy of the magnetic sensor device.
Implementation Method 1
Magnetic sensors using magnetoresistive elements have been used for various applications in recent years
Implementation Method 2
Magnetoresistive elements constituting the Z-axis sensor are disposed on slopes of projections formed on an underlying film of the substrate
Implementation Method 3
the soft magnetic body can be configured to have a function of hardly attenuating the magnetic field in the intended direction of detection but cutting off or attenuating magnetic fields in directions other than the intended direction of detection
Data Source
AI summary
A magnetic sensor device includes a first detection circuit, a second detection circuit, and a processor. The processor is configured to execute first generation processing for generating a first initial detection value, second generation processing for generating a second initial detection value, first correction processing, second correction processing, and determination processing. The first correction processing is processing for correcting the first initial detection value and updating the first initial detection value. The second correction processing is processing for correcting the second initial detection value and updating the second initial detection value. The processor executes the determination processing after alternately executing the first correction processing and the second correction processing.