Magnetic Pressure Sensor with Hall Effect Circuit

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Solution Overview

Problem

Conventional pressure sensors require electrical connections between electrodes and the material subjected to pressure, which can complicate product design and limit freedom in sensor configuration.

Innovation Solution

A pressure sensor using a magnetic field, comprising an elastic portion with magnetic material and a circuit portion that generates a Hall voltage in response to changes in the magnetic field, allowing pressure detection without electrical connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pressure sensors use electrical connections between electrodes and the material subjected to pressure, then the sensing function can be achieved, but the product configuration becomes complicated and design freedom is constrained

Engineering Contradiction:

Improvesensing functionVSAvoidproduct configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the electrical connection system with a magnetic field-based interaction system. The elastic portion containing magnetic particles interacts with the circuit portion through magnetic field coupling, eliminating the need for physical electrical connections between electrodes and the pressure-sensitive material. This substitution of mechanical/electrical connection with magnetic field interaction resolves the contradiction by maintaining sensing reliability while simplifying product configuration and increasing design freedom.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If electrical wiring is provided at both ends of the material that reacts to pressure, then the pressure sensing can be achieved, but the product design is constrained

Engineering Contradiction:

Improvepressure detectionVSAvoidproduct design freedom

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent introduces a magnetic field as an intermediary between the elastic portion and the circuit portion. Instead of direct electrical wiring, the magnetic field serves as a mediator that transmits the pressure-induced deformation information from the elastic portion to the circuit portion. This intermediary approach maintains measurement precision for pressure detection while significantly enhancing product design freedom by eliminating wiring constraints.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If electrodes are attached to both ends of the material subjected to pressure, then the pressure sensing function is achieved, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvepressure sensing functionVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the complex electrode attachment and wiring process with a magnetic field-based sensing approach. The circuit portion detects pressure indirectly through changes in the magnetic field generated by the elastic portion containing magnetic particles. This substitution eliminates the need for precise electrode positioning and wiring, significantly simplifying the manufacturing process while maintaining reliable pressure sensing function.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables remote pressure sensing using a magnetic field, simplifying sensor design and facilitating integration with other microelectronic circuits, particularly suitable for Internet of Things (IoT) applications.

Implementation Method 1

an elastic portion containing a magnetic material having remanent magnetization... when at least a portion of the elastic portion is deformed due to external pressure, causing a change in the magnetic field acting on the circuit portion

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

a circuit portion configured to generate a Hall voltage in response to a change in a magnetic field... the circuit portion detects a magnitude of the Hall voltage corresponding to the change in the magnetic field

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentUS20250123122A1Pressure sensor using magnetic field

Publication Date: 2025.04.17 CK MATERIALS LAB

AI summary

The present invention relates to a pressure sensor using a magnetic field. The pressure sensor using a magnetic field of the present invention includes an elastic portion containing a magnetic material having remanent magnetization; and a circuit portion configured to generate a Hall voltage in response to a change in a magnetic field, wherein when at least a portion of the elastic portion is deformed due to external pressure, causing a change in the magnetic field acting on the circuit portion, the circuit portion detects a magnitude of the Hall voltage corresponding to the change in the magnetic field.