Laminated Wireless Coil Unit for Reduced Electromagnetic Coupling
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Solution Overview
Problem
In portable wireless terminals, the integration of non-contact power transmission and wireless communication coils often leads to performance deterioration due to electromagnetic coupling, making it challenging to reduce the size of the device while maintaining efficient power transmission and communication distances.
Innovation Solution
A coil unit design where a non-contact power transmission coil and a non-contact wireless communication coil are electrically isolated and arranged in a laminated structure with magnetic bodies, minimizing overlap and optimizing resonance frequencies and permeability to reduce electromagnetic coupling, allowing for a compact form factor without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the charging coil is integrated with the battery pack to reduce terminal thickness, then the thickness of the terminal is reduced, but the battery capacity is reduced
Solution Approach 1:
The patent transitions from planar coil arrangement to a three-dimensional laminated structure where the communication coil and power transmission coil are stacked in different layers separated by a magnetic body. This vertical stacking in the thickness direction allows both coils to coexist without occupying the same planar space, enabling compact integration while preserving battery capacity through optimized spatial utilization.
2Quantity of substance
If the charging coil is provided separately from the battery pack, then battery capacity is maintained, but the terminal thickness increases and electromagnetic coupling problems arise
Solution Approach 1:
The patent implements a nested structure where the communication coil and power transmission coil are embedded within a single battery pack assembly in different laminated layers. The magnetic body is positioned between the coils to provide magnetic shielding, creating a compact integrated unit that maintains thin terminal profile while preventing electromagnetic interference through the nested configuration.
3Reliability
If two coils are arranged to form a double ring structure, then reception conditions are improved and coils are less likely to be covered by fingers, but the device size increases
Solution Approach 1:
The patent resolves the size-reliability contradiction by stacking the two coils in different laminated layers separated by a magnetic body, rather than arranging them side-by-side in the same plane. This vertical separation maintains good reception conditions for both coils while minimizing the planar area occupied, enabling compact device design without sacrificing communication reliability.
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 design effectively reduces electromagnetic coupling between coils, maintaining high power transmission efficiency and communication distances, enabling a smaller portable wireless terminal with improved performance.
Implementation Method 1
a magnetic body...optimizing resonance frequencies and permeability to reduce electromagnetic coupling
Implementation Method 2
Examples of the non-contact power transmission type include an electromagnetic induction type and a magnetic field resonance type
Implementation Method 3
Examples of the non-contact power transmission type include an electromagnetic induction type and a magnetic field resonance type
Data Source
AI summary
A chargeable communication module is provided, which includes: a wireless power charging coil; a wireless communication coil being electrically isolated from the wireless power charging coil; and a magnetic body. The wireless power charging coil is disposed on a surface of the magnetic body. The wireless communication coil is arranged adjacent to and outside of the wireless power charging coil. At least a portion of the wireless communication coil is disposed on the surface of the magnetic body.