Magnetic Sensing Layout With 90° Phase Shift for High-Field Accuracy
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Solution Overview
Problem
Conventional magnetic sensing devices fail to accurately measure angles or positions in high magnetic field environments, such as those exceeding 50G, often producing erroneous results due to magnetic field intensity exceeding 600G or 1000G.
Innovation Solution
A magnetic sensing device with a substrate supporting three sensing areas arranged symmetrically, where the first and second sensing areas output a 90-degree phase difference signal to determine distance, speed, or angle of movement, while the third sensing area outputs a complementary signal to enhance accuracy across varying magnetic field intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnetic sensing device is used, then the device can accurately output results at low magnetic field intensity (50G or less), but the output result becomes abnormal when magnetic field intensity is high (50G or more, particularly 700G or 1000G or more)
Solution Approach 1:
The sensing device is divided into three sensing areas (first, second, and third sensing areas) arranged symmetrically on the substrate. Each sensing area generates a signal, and the signals are processed to determine movement parameters. This segmentation allows the device to handle high magnetic field intensities by distributing the sensing function across multiple areas, preventing signal saturation and maintaining measurement accuracy in high magnetic field environments.
Solution Approach 2:
The three sensing areas are arranged symmetrically on the substrate with specific geometric relationships between them. The first and second sensing areas are positioned to generate signals with a 90-degree phase difference, while the third sensing area provides additional information. This asymmetric-symmetric combination enables the device to maintain accurate measurements across varying magnetic field intensities by utilizing the phase difference between signals from different sensing areas.
2Device complexity
If the magnetic sensing device uses a simple sensing structure, then the device complexity is low, but the measurement precision deteriorates in high magnetic field conditions
Solution Approach 1:
The patent combines three sensing areas on a single substrate into an integrated sensing device. The first, second, and third sensing areas work together to generate signals that are processed to determine movement parameters. This merging of multiple sensing functions into a single device structure maintains relatively low device complexity while significantly improving measurement precision in high magnetic field conditions through signal combination and phase difference utilization.
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 device accurately determines distance, speed, or angle of movement and direction of relative motion even in high magnetic field conditions by utilizing symmetrical sensing areas to maintain a consistent phase difference, reducing errors and ensuring precise measurements.
Implementation Method 1
The object has a magnetic field to be measured thereon. The magnetic sensing device is configured to sense a distance or a speed or an angle of movement and a direction of movement of the relative motion.
Data Source
AI summary
A magnetic sensing device including a substrate having a supporting surface on which a first sensing area, a third sensing area, and a second sensing area are consecutively arranged in a direction of movement. The first, the second, and the third sensing areas are provided with a first midline, a second midline, and a third midline in the direction of movement, respectively. The first and second midlines are symmetrical with respect to the third midline. The first and second sensing areas are jointly configured to output a first output signal. The third sensing area is configured to output a second output signal. A phase difference between the first and second output signals is 90 degrees, and the first and second output signals are jointly configured to determine the distance or the speed or the angle of movement and the direction of movement of the relative motion.