Multilayer Wireless Charging Coil for Uniform Current Distribution
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Solution Overview
Problem
Current wireless charging coils suffer from non-uniform current distribution, leading to reduced effective charging areas, increased impedance, and low charging efficiency.
Innovation Solution
The wireless charging coil design includes multiple coil groups stacked in layers, with an insulation layer between them. The coil groups are connected in series, and the first area features coils connected in parallel across multiple layers to improve current distribution uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If coils are arranged in a conventional single-layer or simple multi-layer structure, then the device complexity is low, but current distribution uniformity deteriorates
Solution Approach 1:
The coil structure is divided into multiple independent coil groups arranged in series across multiple layers. Each coil group contains multiple coils that can be independently configured, allowing current to be distributed across different spatial paths. This segmentation enables improved current distribution uniformity by preventing current concentration in specific regions while maintaining a manageable modular structure.
Solution Approach 2:
The patent transitions from conventional single-layer or simple two-layer coil arrangements to a multi-layer three-dimensional structure with coil groups distributed across multiple layers. This dimensional expansion allows current to flow through multiple spatial paths simultaneously, improving current distribution uniformity by utilizing the third dimension (layer stacking) to distribute current more evenly throughout the coil structure.
2Productivity
If current is concentrated in specific coils, then the device complexity remains simple, but charging efficiency deteriorates
Solution Approach 1:
By segmenting the coil structure into multiple coil groups with multiple coils each, the patent creates multiple parallel current paths. This prevents current concentration in specific coils and distributes it evenly across all coil groups, reducing energy loss from inefficient current distribution and improving overall charging efficiency through better utilization of the entire coil structure.
Solution Approach 2:
The patent merges multiple coils across multiple layers into a unified series-connected coil group structure. This combination allows current to utilize all coils simultaneously in an optimized path, preventing energy loss from underutilized coils and improving charging efficiency by ensuring all components contribute effectively to the charging process.
3Area of stationary object
If conventional coil arrangements are used, then the manufacturing process is simple, but effective charging area is reduced
Solution Approach 1:
The patent utilizes multi-layer stacking to expand the effective charging area in the vertical dimension. By arranging coil groups across multiple layers with insulation layers between them, the design increases the total effective area available for charging without significantly complicating the manufacturing process, as the layered structure can be fabricated using standard multi-layer PCB or coil winding techniques.
Solution Approach 2:
The coil structure is segmented into multiple coil groups distributed across different layers and positions. This segmentation allows the effective charging area to be expanded by adding more coil groups in series across layers, while each individual coil group remains relatively simple to manufacture. The modular segmented design enables scalable area expansion without proportionally increasing manufacturing complexity.
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 enhances current distribution uniformity, reduces impedance, and improves charging efficiency by optimizing the arrangement and connection of coils within the wireless charging coil.
Implementation Method 1
wireless charging coil
Data Source
AI summary
This application provides a wireless charging coil, and an electronic device and an antenna that include the wireless charging coil. The wireless charging coil includes a plurality of coil groups that are at a plurality of layers and that are connected in series, and an insulation layer that is disposed between two layers of the plurality of coil groups. The wireless charging coil includes a first area and a second area that is disposed at an outer periphery of the first area. A plurality of coil groups disposed in the second area are arranged at the plurality of layers, and each coil group includes a plurality of coils wound in parallel at one layer.