Notched Nanocrystalline Isolation Sheet for Cooler Wireless Charging
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Solution Overview
Problem
Conventional nanocrystalline materials used in wireless charging devices experience heating due to eddy-current losses, leading to reduced charging efficiency after magnetic crushing, which lowers their saturation magnetic induction strength and magnetic permeability.
Innovation Solution
A magnetic isolation sheet with a first nanocrystalline layer featuring a non-closed ring region and notches to avoid magnetic flux changes, combined with other nanocrystalline layers to reduce eddy-current losses and maintain high saturation magnetic induction and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic crushing is performed on nanocrystal to avoid heating, then eddy-current loss is reduced, but saturation magnetic induction strength and magnetic permeability decrease
Solution Approach 1:
The nanocrystalline layer is segmented into multiple regions with different structures: a first region with non-closed ring shape (avoiding eddy currents) and a second region with closed ring shape (maintaining magnetic properties). This segmentation allows different parts to serve different functions, resolving the contradiction between reducing heating and maintaining charging efficiency.
Solution Approach 2:
Different regions of the nanocrystalline layer are given different local qualities: the first region has non-closed ring structure to reduce eddy-current loss, while the second region has closed ring structure to maintain high saturation magnetic induction and permeability. This local differentiation allows the system to simultaneously achieve both reduced heating and maintained charging efficiency.
2Loss of energy
If magnetic crushing is performed on nanocrystal, then eddy-current loss is reduced, but magnetic permeability decreases
Solution Approach 1:
The nanocrystalline layer is divided into multiple regions where the first region (non-closed ring) reduces eddy-current loss and the second region (closed ring) maintains high magnetic permeability. This segmentation enables the system to reduce energy loss in one region while preserving magnetic properties in another region.
Solution Approach 2:
The nanocrystalline layer forms a composite structure combining regions with different geometries (non-closed ring and closed ring). This composite structure integrates the benefits of both configurations: reduced eddy-current loss from the non-closed region and high magnetic permeability from the closed region.
3Reliability
If conventional nanocrystal is used, then high saturation magnetic induction is achieved, but nanocrystal heating occurs
Solution Approach 1:
The nanocrystalline layer is segmented into a first region with non-closed ring shape that prevents eddy-current heating and a second region with closed ring shape that maintains high saturation magnetic induction. This segmentation allows the system to simultaneously achieve high magnetic induction and avoid heating by distributing different functions across different regions.
Solution Approach 2:
Different regions are assigned different local qualities: the first region has a structure optimized for reducing heating (non-closed ring), while the second region has a structure optimized for maintaining high saturation magnetic induction (closed ring). This local quality differentiation resolves the contradiction between avoiding heating and maintaining magnetic properties.
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 enhances wireless charging efficiency by preventing nanocrystal heating and maintaining high magnetic properties, thus improving the overall charging performance of the device.
Implementation Method 1
a change in magnetic flux when magnetic lines of force in a magnetic field pass through the nanocrystal can be avoided
Implementation Method 2
an eddy-current loss caused by the change in magnetic flux is avoided
Implementation Method 3
a nanocrystalline material having a high saturation magnetic induction, a high magnetic permeability
Implementation Method 4
a nanocrystalline material having a high saturation magnetic induction, a high magnetic permeability
Data Source
AI summary
A magnetic isolation sheet, a coil module, and an electronic device are provided. The magnetic isolation sheet is used in a coil module in a wireless charging device. The magnetic isolation sheet includes a first nanocrystalline layer. The first nanocrystalline layer includes a first region in a shape of a non-closed ring. A material of the first region is a nanocrystal on which magnetic crushing has not been performed. Because the first region is in the shape of a non-closed ring, i.e., the first region is provided with a notch penetrating the first region, through the notch, a change in magnetic flux when magnetic lines of force in a magnetic field pass through the nanocrystal can be avoided, and the heating of a nanocrystalline material during wireless charging is avoided.