Laminated Heat Radiation Unit for Wireless Power Systems
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Solution Overview
Problem
Conventional heat radiation metal plates in wireless charging systems suffer from eddy current loss, which decreases charging efficiency due to their thickness, as thinner plates reduce heat radiation performance and thicker plates increase eddy current loss.
Innovation Solution
A heat radiation unit composed of multiple thin thermally conductive metal layers stacked with adhesive layers to minimize eddy current loss, improving charging efficiency while maintaining heat radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thickness of the heat radiation metal plate is increased to improve heat radiation performance, then the heat radiation efficiency is improved, but the eddy current loss increases and charging efficiency decreases
Solution Approach 1:
The heat radiation metal plate is divided into multiple thin layers (first heat radiation metal layer, second heat radiation metal layer, etc.) stacked together. This segmentation reduces the thickness of each individual layer, thereby minimizing eddy current loss in each layer while maintaining the overall heat radiation surface area and performance of the composite structure.
Solution Approach 2:
The patent uses a composite structure consisting of multiple heat radiation metal layers combined with insulating layers (such as resin layers or air gaps). This composite material approach allows the system to achieve both effective heat radiation through the metal layers and reduced eddy current losses by isolating the layers electrically while maintaining thermal conductivity.
2Loss of energy
If the thickness of the heat radiation metal plate is decreased to reduce eddy current loss, then the charging efficiency is improved, but the heat radiation area is reduced and heat radiation performance is lowered
Solution Approach 1:
By segmenting the thin metal layers and stacking multiple layers, the patent increases the total effective heat radiation surface area while keeping each individual layer thin. This maintains charging efficiency by minimizing eddy current loss in each layer while achieving sufficient heat radiation performance through the cumulative surface area of all layers.
Solution Approach 2:
The patent transitions from a single-plane thin plate to a multi-layer stacked structure, utilizing the vertical dimension to increase the total heat radiation surface area. This dimensional change allows the system to achieve adequate heat radiation performance without increasing the thickness of individual layers, thus maintaining low eddy current loss.
3Temperature
If a single thick metal plate is used for heat radiation, then the heat radiation performance is improved, but the charging efficiency is lowered due to eddy current loss
Solution Approach 1:
The single thick metal plate is segmented into multiple thin layers separated by insulating layers. This segmentation dramatically reduces eddy current loss by breaking the continuous conductive path, thereby improving charging efficiency while maintaining heat radiation performance through the cumulative surface area of the stacked thin layers.
Solution Approach 2:
Insulating layers (resin layers or air gaps) are introduced as intermediaries between the thin metal layers. These intermediary layers electrically isolate the metal layers to minimize eddy current loss while allowing thermal energy to transfer, thus improving charging efficiency without compromising heat radiation capability.
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 effectively reduces eddy current loss by laminating multiple thin thermally conductive metal layers, enhancing charging efficiency and suppressing heat generation without compromising heat radiation performance.
Implementation Method 1
a plurality of thermally conductive metal layers stacked in two or more layers
Implementation Method 2
a secondary coil connected to the main body and a battery, and which generates an induced electromotive force by an induced magnetic field generated in the primary coil
Implementation Method 3
a magnetic shield that is disposed on a rear surface of the receiving ferrite member and that blocks the induced magnetic field from being emitted in the battery direction
Implementation Method 4
The eddy current is generated when an alternating magnetic field generated in the secondary coil is induced in the inside of the metal plate which is a conductor by the electromagnetic induction to cause an eddy current loss
Data Source
AI summary
Provided is a heat radiation unit for radiating heat generated during operation of a wireless power transmitting or receiving device and includes a plurality of thermally conductive metal layers stacked in two or more layers and an adhesive layer for attaching the thermally conductive metal layers, to prevent lowering of the charging efficiency and improve the heat radiation performance.