Magnetic Switch Filtering Circuit for Vibration-Resistant Sensing

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Solution Overview

Problem

Conventional magnetic switches face issues of high power consumption and elevated costs due to the use of digital algorithms for bandpass, low-pass, or high-pass filtering, which are necessary to prevent interference from vibration and disruptive signals.

Innovation Solution

A magnetic switch with integrated circuitry comprising a power supply module, comparison module, filtering module, and logic operation module, which sets a switching frequency threshold to output signals only within a set range, reducing power consumption and costs while maintaining high frequency response.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If digital algorithms are used for filtering in MCUs, then filtering function is achieved, but power consumption increases and cost increases

Engineering Contradiction:

Improvefiltering functionVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces the software-based digital filtering algorithm in the MCU with a hardware-based analog filtering circuit. This substitution moves the filtering function from the digital domain (requiring continuous CPU processing and power) to the analog domain (passive circuit operation), thereby achieving the filtering function while significantly reducing power consumption and system cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If digital algorithms are used for filtering in MCUs, then filtering function is achieved, but cost increases

Engineering Contradiction:

Improvefiltering functionVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs simple, inexpensive analog filtering components (resistors, capacitors, operational amplifiers) that can be easily manufactured and replaced if needed. These passive hardware components are significantly cheaper than implementing software filtering algorithms that require sophisticated MCUs with continuous processing capabilities, thereby reducing overall system cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Adaptability or versatility

If magnetic switch responds to all frequency ranges, then detection capability is comprehensive, but susceptibility to vibration and interference increases

Engineering Contradiction:

Improvedetection capabilityVSAvoidvibration interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements filtering action before the signal is processed by the magnetic switch circuitry. By placing the analog filtering circuit in the signal path beforehand, unwanted frequency components (vibrations and interference) are removed in advance, allowing the magnetic switch to respond only to the desired frequency range while maintaining comprehensive detection capability for valid signals.

Inventive Principle:

Principle #10Preliminary action

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 magnetic switch effectively filters out signals outside the set threshold, reducing power consumption and costs while maintaining high frequency response and avoiding interference from vibrations or other environments.

Implementation Method 1

a magnetic sensing module, which is used to generate a magnetic field sensing signal based on variations in magnetic flux

Methodology Applied

Scientific EffectMagnetic flux variation: Magnetic Field

Data Source

PatentUS20250317144A1Magnetic switch having filtering function

Publication Date: 2025.10.09 MULTIDIMENSION TECH CO LTD

AI summary

The present application discloses a magnetic switch having a filtering function. The magnetic switch comprises a magnetic sensing module and a specific integrated circuit. The specific integrated circuit comprises a power supply module, a comparison module, a filtering module and a logic operation module. An output end of the magnetic sensing module is electrically connected to an input end of the comparison module. The filtering module is electrically connected between an output end of the comparison module and an input end of the logic operation module. Or the filtering module is electrically connected between the output end of the magnetic sensing module and the input end of the logic operation module. The present application provides a highly integrated magnetic switch which has high frequency response, not only has the characteristics of a conventional magnetic switch, but also can set a switching frequency threshold by means of the filtering module, such that the highly integration magnetic switch can output high and low level change signals within a set switching frequency range. Therefore, the present application not only avoids the effect of invalid of the magnetic switch under the effect of a vibration or other environments, but also lower the power consumption and costs.