Wireless Charging Case Magnetic Conductor for Coil Gap Loss
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Solution Overview
Problem
Conventional wireless charging systems face inefficiencies due to increased gap between charging coils when devices are seated in cases, leading to higher power leakage and longer charging times, especially in space-restricted electronic devices with reduced magnetic flux conductivity.
Innovation Solution
Incorporating a second magnetic conductor within the case material, such as nanocrystalline foil or ferrite, to reduce the effective gap between the wireless charging coils and enhance magnetic flux conduction, thereby improving charging efficiency and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a case is added to protect the electronic device, then device protection is improved, but the gap between charging coils increases leading to reduced charging efficiency
Solution Approach 1:
A magnetic conductor is introduced as an intermediary component between the wireless charging coil and the case. This magnetic conductor serves as a mediator that guides and concentrates magnetic flux through the case material, enabling the case to provide protection while maintaining charging efficiency by reducing the effective gap distance for magnetic field penetration.
Solution Approach 2:
The magnetic conductor changes the magnetic permeability parameter of the case structure. By incorporating material with high magnetic permeability, the case transforms from being magnetically resistive to being magnetically conductive, thereby improving coupling efficiency between charging coils despite the physical gap introduced by case thickness.
2Volume of moving object
If device size is reduced to meet market demands, then portability is improved, but available space for magnetic charging materials is limited
Solution Approach 1:
Instead of uniformly distributing magnetic materials throughout the device, the magnetic conductor is strategically positioned only in the critical region between the wireless charging coil and the case. This localized placement provides the necessary magnetic flux guidance while minimizing material usage and preserving device compactness.
Solution Approach 2:
The case is designed as a composite structure combining non-magnetic protective material with a magnetic conductor layer. This composite approach allows the case to maintain its protective function while adding magnetic flux conduction capability, achieving both protection and charging efficiency without increasing overall device volume.
3Strength
If gap between charging coils is increased due to case thickness, then device protection is improved, but magnetic flux conductivity deteriorates
Solution Approach 1:
The magnetic conductor acts as an intermediary that bridges the magnetic flux path across the case thickness. It provides a low-reluctance path for magnetic flux to travel through the case material, effectively reducing the magnetic gap despite the physical distance, thereby maintaining reliable magnetic flux conductivity while preserving device protection.
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 solution maintains high charging efficiency and reduces power loss, ensuring faster charging times even with increased gap distances between the coils, achieving up to 95% coupling efficiency and minimizing heat generation.
Implementation Method 1
an oscillating magnetic field may be generated by a wireless charging coil
Implementation Method 2
Incorporating a second magnetic conductor within the case material, such as nanocrystalline foil or ferrite, to reduce the effective gap between the wireless charging coils and enhance magnetic flux conduction
Data Source
AI summary
Electronic apparatuses according to embodiments of the present technology may include an electronic device a first surface and a second surface opposite the first. The electronic device may include a battery and a wireless charging coil within an interior volume of the device. The electronic device may include a first magnetic conductor and positioned between the battery and the wireless charging coil. The electronic device may also include an integrated circuit coupled with the battery and the wireless charging coil. The apparatuses may include a case extending about the electronic device. The case may be characterized by a first surface and a second surface. The case may be characterized by a thickness between the first surface of the case and the second surface of the case. The case may include a second magnetic conductor incorporated within the thickness of the case at the second surface of the case.