Electronic device, wireless charger and wireless charging system
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Solution Overview
Problem
Wireless charging systems face inefficiencies due to coupling limitations between transmitter and receiver coils, particularly in devices with metallic enclosures that cause electromagnetic interference (EMI) and uneven power distribution.
Innovation Solution
Incorporating a receiver coil with a high magnetic permeability holding structure outside the metal housing and a wireless charger with multiple concentric coils, each independently driven by a driver circuit, to optimize magnetic field shaping and power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a receiver coil is placed inside a metal housing, then the device structure is compact and protected, but electromagnetic interference increases and power transmission efficiency decreases
Solution Approach 1:
The receiver coil is extracted from the interior of the metal housing and positioned in a recess on the outer surface. This extraction removes the coil from the harmful electromagnetic environment inside the metal enclosure, reducing EMI and improving power transmission efficiency while maintaining device protection through the recess structure.
Solution Approach 2:
A holding structure made of high magnetic permeability material is introduced as an intermediary between the receiver coil and the metal housing. This intermediary material guides and concentrates magnetic flux, enhancing the magnetic field at the coil location while isolating it from the metal housing that would otherwise cause eddy currents and EMI.
2Reliability
If multiple concentric coils are used in a wireless charger, then magnetic field shaping and power distribution are improved, but device complexity increases
Solution Approach 1:
The wireless charger employs multiple concentric coils segmented into different zones, each independently controlled by separate driver circuits. This segmentation allows different regions of the charging surface to be activated selectively based on device position and power requirements, improving power distribution efficiency while managing complexity through modular control.
Solution Approach 2:
Different concentric coils are activated based on local requirements - outer coils for devices at the periphery, inner coils for centrally positioned devices. This local quality approach optimizes magnetic field intensity and power transfer efficiency for each specific charging scenario, reducing overall system complexity by activating only necessary coil segments.
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
Enhances wireless power transmission efficiency by reducing EMI and allowing customizable magnetic field intensity, improving power distribution and safety while maintaining interoperability.
Implementation Method 1
a receiver coil configured to receive wireless power
Implementation Method 2
the holding structure comprises a material with a high magnetic permeability
Data Source
AI summary
An electronic device, a wireless charger and a wireless charging system are disclosed. In an embodiment an electronic device includes a metal housing including electronic components of the electronic device, a recess in the metal housing, a receiver coil configured to receive wireless power, the receiver coil located in the recess outside of the metal housing and a holding structure for the receiver coil, wherein the holding structure comprises a material with a high magnetic permeability, and wherein the receiver coil is electrically connected to the electronic components inside the metal housing.