Inductive Charger Magnetic Insert Design
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Solution Overview
Problem
Existing inductive chargers for electronic devices face challenges in securely holding and aligning devices during charging, especially in vehicles where high acceleration forces can cause devices to slip or fall, and the magnetic fields used for alignment can interfere with the inductive coupling efficiency.
Innovation Solution
The design incorporates a magnetic insert with magnets and a fastening contour that attaches to the charging cradle surface, allowing the magnets to be closer to the device for enhanced holding force while maintaining a greater distance from the coil arrangement to minimize interference with the inductive coupling, along with a support mat that accommodates the magnetic insert and features a recess for the magnets, and an optional plastic insert without magnets for devices without built-in magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnets are positioned close to the electronic device to increase holding force, then the holding force is improved, but the magnetic field interference with inductive coupling increases
Solution Approach 1:
The patent positions magnets in the support mat at a distance from the charging surface, utilizing the vertical dimension to resolve the contradiction. By placing magnets below the support mat rather than directly on the charging cradle surface, the system achieves sufficient holding force through the combined effect of magnetic attraction and support mat friction, while minimizing magnetic field interference with the coil arrangement.
2Measurement precision
If magnets are positioned close to the electronic device to increase holding force, then the alignment precision is improved, but the inductive charging efficiency deteriorates
Solution Approach 1:
The support mat acts as an intermediary layer that separates the magnets from the charging surface. This dimensional separation allows magnets to be positioned in a location where they can effectively align devices through magnetic attraction without their fields interfering with the inductive coupling between the coil arrangement and device coil.
Solution Approach 2:
The support mat serves as a mediator between the magnets and the electronic device. It transmits the magnetic holding and alignment forces to the device while simultaneously protecting the inductive charging process from magnetic interference, thus resolving the contradiction between alignment precision and charging efficiency.
3Force
If magnets are attached directly to the charging cradle surface, then the device holding force is improved, but the support mat is subjected to excessive force that may damage it
Solution Approach 1:
By positioning magnets below the support mat rather than directly on the charging surface, the patent distributes the magnetic forces through the support mat in a controlled manner. The support mat's friction and positive engagement mechanisms share the load, preventing excessive point loads that would damage the mat while maintaining effective device holding force.
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 configuration significantly increases the holding force of electronic devices and reduces the negative impact of magnetic fields on inductive charging efficiency, ensuring secure alignment and efficient energy transfer.
Implementation Method 1
coil arrangement for electronically charging electronic devices
Implementation Method 2
magnetic insert with magnets... the poles of the permanent magnets are arranged parallel to the charging cradle surface, and the magnetic field is perpendicular to the charging cradle surface
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention relates to an inductive charger (1) with a charging cradle body (2) having a coil arrangement for inductively charging electrical devices and a charging cradle surface (3) covering the coil body, and with a support mat (4) designed to rest on the charging cradle surface (3), characterized by a magnetic insert (5) having magnets (7) and a fastening contour (10) and designed to rest on the charging cradle surface (3) and to be attached to the charging cradle surface (3) by means of the fastening contour (10), and that the support mat (4) has a recess on the underside provided for resting on the charging cradle surface (3) for receiving the magnetic insert (5).