Protective Case High Permeability Core Wireless Charging
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Solution Overview
Problem
Electronic device cases often reduce the efficiency of wireless charging due to their thickness and material properties, which can block or attenuate the magnetic field necessary for inductive power transfer, especially when using third-party chargers or protective enclosures that do not align devices correctly.
Innovation Solution
Incorporating a high magnetic permeability core, such as ferrite, into the case design to align with the wireless charging coil of the electronic device, enhancing magnetic coupling between the device's charging coil and an external charging coil, thereby improving the efficiency of wireless power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective case is used to protect the electronic device, then device protection is improved, but wireless charging efficiency deteriorates due to case thickness and material properties blocking the magnetic field
Solution Approach 1:
A magnetic coupling enhancement component is introduced as an intermediary element within the protective case. This component acts as a mediator between the wireless charging coil and the external charging source, improving magnetic field coupling while allowing the protective case to maintain its protective function. The intermediary component compensates for the magnetic field attenuation caused by the case materials.
Solution Approach 2:
The magnetic coupling enhancement component changes the magnetic properties of the case structure by introducing materials or elements with specific magnetic permeability characteristics. This parameter change allows the case to maintain protection while enabling effective magnetic field transmission for wireless charging.
2Strength
If case materials with certain properties are used for protection, then device protection is improved, but magnetic field transmission deteriorates due to material blocking or attenuation
Solution Approach 1:
The case structure is designed with different material properties in different regions. The magnetic coupling enhancement component is strategically positioned in the area where magnetic field transmission is most critical, creating local quality variation that optimizes both protection and magnetic field transmission without compromising overall case strength.
3Adaptability or versatility
If third-party chargers or protective enclosures are used, then device compatibility is improved, but wireless charging alignment deteriorates due to incorrect device alignment
Solution Approach 1:
The magnetic coupling enhancement component is designed to work with multiple wireless charging standards and third-party chargers, providing universal compatibility. The component's positioning and design enable it to function across different charging systems while maintaining proper alignment, thus achieving multi-functionality that addresses both compatibility and alignment requirements.
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 high magnetic permeability core increases the efficiency of wireless charging by concentrating and directing the magnetic flux, allowing for effective power transfer even when the device is in a protective case, and can adapt to different wireless charging protocols, ensuring compatibility with various charging sources.
Implementation Method 1
The core comprises a second material that has a magnetic permeability that is substantially greater than a magnetic permeability of the first material
Implementation Method 2
The core increases inductive magnetic coupling between the wireless charging coil of the wireless charging circuitry of the installed electronic device and a source charging coil
Data Source
AI summary
A protective case includes a shell for receiving and at least partially covering an electronic device. The shell includes a first material and has a back portion and side portions extending from the back portion. The back portion is configured to be adjacent to the back surface of the electronic device when the electronic device is installed. The case also includes a core comprising a second material having a magnetic permeability substantially greater than a magnetic permeability of the first material. The core is affixed to the back portion of the shell at a location that coincides with a center region of the wireless charging coil of the wireless charging circuitry of the installed electronic device. The core increases magnetic coupling between the wireless charging coil of the installed electronic device and a source charging coil when the protective case is placed in proximity to the source charging coil.