Magnetic Sensor Signal Processing Circuit Offset Detection
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Solution Overview
Problem
Existing magnetic position detection devices struggle to quickly detect changes in offsets of detection signals, leading to inaccurate position information due to high processing loads on single processors.
Innovation Solution
A position detection device with a signal processing circuit that utilizes two processors: one for sphere information reception and storage, and another for generating and transmitting sphere information, allowing for quick detection of offset changes without the need for the first processor to generate sphere information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single processor executes both position information generation and offset correction processing, then device complexity is reduced, but the processing load increases and offset change detection speed decreases
Solution Approach 1:
The patent divides the signal processing circuit into two separate processors: a first processor dedicated to position information generation and a second processor dedicated to offset correction processing. This segmentation allows each processor to specialize in specific tasks, reducing mutual interference and improving overall processing efficiency. The first processor handles sphere information generation and position calculation, while the second processor focuses on detecting offset changes by comparing measurement points with the virtual sphere model.
2Device complexity
If a single processor handles all processing tasks, then device structure is simplified, but processing load increases leading to slower offset change detection
Solution Approach 1:
The patent segments processing functions across two processors to reduce detection time. The second processor continuously monitors offset changes by comparing new measurement points against the virtual sphere model maintained by the first processor. This parallel processing architecture enables simultaneous position generation and offset monitoring, significantly reducing the time required to detect offset changes compared to sequential processing on a single processor.
3Productivity
If the first processor generates sphere information, then processing steps are reduced, but the processing load on the position generation processor increases
Solution Approach 1:
The patent assigns sphere information generation to the first processor and offset correction processing to the second processor. This functional distribution balances the processing load: the first processor focuses on generating and maintaining the virtual sphere model from measurement points, while the second processor uses this model to detect offset changes. The segmentation prevents the first processor from being overloaded with both model generation and offset detection tasks.
Data Source
AI summary
A magnetic sensor system includes a magnetic sensor device and a signal processing circuit. The magnetic sensor device generates first to third detection signals corresponding to components in three directions a field generated by a magnetic field generator that is able to change its relative position with respect to the magnetic sensor device. The signal processing circuit includes first and second processors. The second processor generates sphere information and transmits it to the first processor. When coordinates representing a set of values of the first to third detection signals in an orthogonal coordinate system are taken as a measurement point, the sphere information includes data on center coordinates of a virtual sphere having a spherical surface approximating a distribution of a plurality of measurement points. The first processor detects a change in offsets of the first to third detection signals by using the sphere information transmitted from the second processor.