Hall Sensor Blind Hole Magnetic Body Detection
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Solution Overview
Problem
Existing electronic devices used in industrial process measurement technology face challenges in operating reliably both with and without magnetic switches, as they need to distinguish between a magnetic body and external magnetic interference fields, while avoiding openings that could allow corrosive or explosive media to penetrate.
Innovation Solution
The electronic device employs a blind hole with two Hall sensors positioned to detect magnetic field components perpendicular to the blind hole's longitudinal direction, using a ratio of signal sums to signal differences and state values to determine the presence of a magnetic body, allowing the control and evaluation circuit to differentiate between magnetic switches and external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic switches are used to enable operation without openings in the housing, then protection against corrosive or explosive media penetration is improved, but the ability to reliably distinguish between magnetic bodies and external magnetic interference fields deteriorates
Solution Approach 1:
The patent divides the magnetic field detection function into two separate Hall sensors positioned at different locations within the housing. Each sensor detects magnetic field components at its specific position, allowing the system to segment the detection task and compare results to distinguish genuine magnetic bodies from external interference fields.
Solution Approach 2:
The patent introduces a control and evaluation circuit as an intermediary that processes signals from both Hall sensors. This intermediary component performs the discrimination function by evaluating the relationship between the two sensor signals, determining whether a magnetic body is genuinely present or if external interference is causing false readings.
2Adaptability or versatility
If the electronic device is designed to operate both with and without magnetic switches using a standardized circuit, then adaptability and versatility are improved, but the complexity of ensuring reliable operation in both variants deteriorates
Solution Approach 1:
The patent designs the control and evaluation circuit to perform multiple functions: it operates whether or not a magnetic body is present, evaluates signals from two Hall sensors, distinguishes between genuine magnetic bodies and external interference, and adapts its evaluation based on the presence or absence of magnetic operating elements. This universal design allows the same circuit to reliably support both variants of the electronic device.
3Measurement precision
If two Hall sensors are positioned to detect magnetic field components perpendicular to the blind hole's longitudinal direction, then measurement precision for distinguishing magnetic bodies from interference is improved, but device complexity increases
Solution Approach 1:
The patent positions the two Hall sensors asymmetrically at different locations within the housing, specifically arranged to detect magnetic field components perpendicular to the blind hole's longitudinal direction. This asymmetric positioning creates distinct detection patterns for genuine magnetic bodies versus external interference fields, enabling precise discrimination through signal comparison.
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
This solution enables the electronic device to operate reliably with and without magnetic switches, ensuring proper functioning by accurately detecting the presence of a magnetic body and distinguishing it from external magnetic fields, thus maintaining device integrity and functionality.
Implementation Method 1
two Hall sensors (22, 24) which are positioned in the longitudinal direction of the blind hole (14) spaced from each other
Data Source
Figure 1a~1b
Figure 2~3a
Figure 3b~3c
AI summary
The invention relates to an electronic device comprising: a housing (10) having at least one chamber (12); a magnetic body guide (14) for receiving and guiding a magnetic body (30), wherein the magnetic body guide allows position of a received magnetic body in at least two magnetic body positions (a, b) with respect to the housing; a control and analysis circuit (20) in the chamber having two Hall-effect sensors (22, 24) for detecting at least one component of a first local magnetic field at the location of the first Hall-effect sensor and for each providing a signal S1, S2 depending on the detected local magnetic field at the first location, wherein the two Hall-effect sensors each comprise a defined position with respect to the housing, and wherein the control circuit is suitable for determining on the basis of the signals S1, S2 whether a magnetic body is present in the magnetic body guide and, if so, determining on the basis of at least one of the signals S1, S2 whether the magnetic body is present at the first defined magnetic body position or has been displaced out of said position.