3D Magnetic Position Sensing for Charging Case Placement Detection

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Solution Overview

Problem

Existing electronic devices face challenges in efficiently initiating and managing charging processes based on the proper placement of components within charging compartments, particularly in wireless charging scenarios, without complex mechanical contacts or multiple magnetic switches.

Innovation Solution

A 3D magnetic field sensor is used to detect the position of electronic components relative to charging compartments within a case, utilizing magnetic fields generated by internal magnets, allowing for contactless position sensing and efficient charging initiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical contacts or multiple magnetic switches are used to detect component placement, then position detection reliability is improved, but device complexity and manufacturing costs increase

Engineering Contradiction:

Improveposition detection reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple detection functions into a single 3D magnetic field sensor that can detect both presence and positional information of electronic components. This single sensor replaces what would traditionally require multiple separate switches or contacts, thereby maintaining detection reliability while reducing device complexity and the number of components required.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces mechanical contact-based detection systems with a magnetic field-based detection system. The 3D magnetic field sensor detects component placement through magnetic field interactions without requiring physical contact, eliminating wear and contact reliability issues while simplifying the mechanical structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If mechanical contacts are used to detect component placement, then position detection accuracy is improved, but manufacturing costs and device complexity increase

Engineering Contradiction:

Improveposition detection accuracyVSAvoidmanufacturing costs

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical contact systems with a magnetic field-based detection system using a 3D magnetic field sensor. This substitution maintains position detection accuracy by measuring magnetic field variations that change with component position, while significantly reducing manufacturing complexity and costs by eliminating multiple mechanical components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes changes in magnetic field parameters (strength, direction, distribution) as electronic components are placed or moved within the charging case. The 3D magnetic field sensor detects these parameter changes to determine component position, providing accurate measurement without requiring complex mechanical structures.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If multiple magnetic switches are used for position detection, then detection reliability is improved, but the number of components and device complexity increase

Engineering Contradiction:

Improvedetection reliabilityVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent merges the functionality of multiple magnetic switches into a single 3D magnetic field sensor. This single sensor can detect the presence and position of multiple electronic components by analyzing the composite magnetic field, thereby reducing the total number of components while maintaining or improving detection reliability through more sophisticated field analysis.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The 3D magnetic field sensor serves multiple detection functions simultaneously - it can detect the presence of components, determine their positions, and potentially identify their orientations. This multi-functionality replaces what would traditionally require multiple specialized switches, reducing component quantity while enhancing detection capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 reliable and efficient charging processes by detecting component placement without mechanical contacts or multiple switches, reducing complexity and costs while ensuring accurate positioning and pairing with other devices.

Implementation Method 1

a 3D magnetic field sensor included in the case... sensing, by a 3D magnetic field sensor included in a case, a magnetic field generated by a magnet included in an electronic component

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS12355274B2Devices and methods for position detection by a 3D magnetic field sensor

Publication Date: 2025.07.08 INFINEON TECHNOLOGIES AG

AI summary

A device includes a first electronic component and a case, wherein the case includes a first charging compartment configured to accommodate and charge the first electronic component. The device further includes a first magnet included in the first electronic component and a 3D magnetic field sensor included in the case. The device further includes a detection unit configured to detect a position of the first electronic component relative to the first charging compartment based on a magnetic field sensed by the 3D magnetic field sensor.