Omnidirectional Magnetic Switch Using Absolute-Value Threshold Sensing
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Solution Overview
Problem
Magnetic switches that detect magnetic fields in only one direction are prone to misalignment issues, leading to uncertainty and potential malfunctions, and existing solutions for multi-directional sensing either improve sensitivity minimally or require complex calculations and memory usage.
Innovation Solution
A magnetic switch that detects magnetic fields in two or three directions by providing signals representative of the absolute values of field components in different directions, which are compared to threshold values using simple processing, allowing for accurate and omnidirectional sensing with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensing is performed in multiple directions using complex vectorial calculations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses simple absolute value comparison instead of complex vector calculations, trading computational accuracy for extremely simple processing that is fast and energy-efficient enough for practical applications
Solution Approach 2:
The patent changes the comparison parameter from vector magnitude (requiring square roots and divisions) to sum of absolute values, which is computationally simpler and achieves sufficient accuracy for most applications
2Measurement precision
If magnetic sensing is performed in multiple directions with extensive memory usage, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses simple absolute value comparison instead of complex vector calculations, trading computational accuracy for extremely simple processing that is fast and energy-efficient enough for practical applications
Solution Approach 2:
The patent changes the comparison parameter from vector magnitude (requiring square roots and divisions) to sum of absolute values, which is computationally simpler and achieves sufficient accuracy for most applications
3Device complexity
If single-direction magnetic sensing is used, then device complexity is reduced, but reliability deteriorates due to misalignment issues
Solution Approach 1:
The patent transitions from single-direction sensing to multi-directional sensing by adding perpendicular sensing elements, thereby eliminating alignment sensitivity and improving reliability without significant complexity increase
Solution Approach 2:
The patent makes the magnetic switch omnidirectional by incorporating multiple sensing elements that can detect magnetic fields from any direction, making the device universally applicable regardless of field orientation
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 solution provides accurate and reliable magnetic switching with reduced processing power and energy consumption, enabling detection in any direction with simple circuitry and minimal assembly constraints, effectively addressing alignment issues and complexity in existing technologies.
Implementation Method 1
a magnetic field sensing system configured for providing a first signal representative of the absolute value of a first component of the magnetic field in a first direction and at least a second signal representative of the absolute value of a second component of the magnetic field in a further direction
Data Source
AI summary
A magnetic switch is provided, comprising a magnetic field sensing system configured for providing a first signal representative of the absolute value of a first component of the magnetic field in a first direction and at least a second signal representative of the absolute value of a second component of the magnetic field in a further direction different from the first direction. It includes comparing means adapted for comparing the sum of the absolute values of at least the first and second signals with a threshold value. The magnetic sensor further comprises a connection to the comparing means for providing at least one status signal as output of the switch. The output is a signal representing either that the sum is higher or lower than the threshold.