Segmented Conductive Plate for Wireless Charging Efficiency
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Solution Overview
Problem
Metallic cases in portable terminals degrade wireless charging efficiency by reducing the coupling coefficient, making it difficult to wirelessly charge devices effectively.
Innovation Solution
A conductive plate with metal members and an insulating layer, formed by anodizing, is used to couple separate plates to create a flat shape, allowing for efficient wireless charging by maintaining electrical insulation and increasing the inductance coupling coefficient, even when the cover is made of metallic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metal case is used for the portable terminal, then the design factor is improved, but the wireless charging efficiency is degraded
Solution Approach 1:
The metal case is divided into multiple separate metal plates instead of using a single continuous metal plate. This segmentation creates gaps between the plates that allow magnetic field penetration, enabling wireless charging while maintaining the metallic appearance and structural integrity of the case.
Solution Approach 2:
The metal case structure is designed with different properties in different regions: the metal plates provide metallic appearance and structural strength, while the gaps between plates provide magnetic field permeability for wireless charging. This local differentiation resolves the contradiction between metallic appearance and wireless charging efficiency.
2Reliability
If separate metal plates are coupled to form a flat plate shape, then the inductance coupling coefficient is increased, but electrical insulation between metal members must be maintained
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent metal plates at their contact lines. This insulating layer prevents electrical short circuits while allowing the metal plates to be closely coupled for high inductance coupling coefficient. The contact lines themselves serve as the coupling path for magnetic fields while the insulating layer maintains electrical isolation.
Solution Approach 2:
The metal case structure combines metal plates with insulating materials (such as anodized oxide layers or polymer coatings) to create a composite structure. This composite approach allows simultaneous achievement of electrical insulation and magnetic coupling, resolving the contradiction between insulation requirements and coupling efficiency.
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 enhances wireless charging efficiency by maintaining electrical insulation between metal members, allowing for effective power transmission and heat dissipation, while maintaining a metallic appearance and design integrity.
Implementation Method 1
an insulating layer disposed on a surface of at least one of the metal members to insulate the metal members from each other
Implementation Method 2
the insulating layer may include an oxidation film formed by anodizing at least one of the metal members
Implementation Method 3
at least one coil substrate electrically connected to the device body
Implementation Method 4
the conductive plate may serve as a heat radiating member disposed between the coil substrate and the cover to transfer heat generated by the coil substrate to the cover
Data Source
AI summary
A conductive plate and an electronic device including the same are provided. A conductive plate to be included in a terminal and disposed on a side of a coil substrate for wireless charging the terminal includes metal members each having a plate shape and an insulating layer disposed on a surface of at least one of the metal members to insulate the metal members from each other, wherein the metal members are coupled to each other to complete a flat plate shape.