Multi-Layer Transmitter Coil Arrangement for Wireless Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless charging devices often require electronic devices to be placed in a confined charging region for efficient power transfer, limiting the ease of charging and potentially wasting power if the device is positioned outside this region.
Innovation Solution
A wireless charging mat with a broad charging surface featuring a transmitter coil arrangement in multiple layers, where each layer has coils arranged in different patterns to create a continuous magnetic field across the surface, allowing devices to be charged at any location within the mat's area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single-layer transmitter coil arrangement is used, then the device complexity is reduced, but the charging region area is limited and confined
Solution Approach 1:
The patent transitions from a single-layer (2D) coil arrangement to a multi-layer (3D) coil arrangement. By stacking multiple layers of transmitter coils with different patterns, the charging region area is significantly expanded while maintaining manageable complexity through systematic layer design.
Solution Approach 2:
The charging surface is divided into multiple layers, each containing segmented coil patterns. This segmentation allows each layer to contribute to different regions of the charging surface, collectively creating a broad continuous charging area without requiring a single overly complex coil structure.
2Area of stationary object
If transmitter coils are positioned to cover broad areas, then the charging region expands, but the magnetic field uniformity deteriorates
Solution Approach 1:
Different layers of transmitter coils are designed with different local patterns optimized for their specific regions. Each layer's coil pattern is tailored to provide uniform magnetic field coverage in its designated area, and the combination of layers achieves overall uniformity across the entire broad charging surface.
3Area of stationary object
If multiple layers of transmitter coils are added, then the charging region area increases, but the manufacturing complexity increases
Solution Approach 1:
By adding layers in the vertical dimension rather than expanding horizontally, the patent achieves broader charging coverage without proportionally increasing manufacturing complexity. The layered structure allows for modular assembly and standardized coil patterns that can be manufactured using similar processes.
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
Enables efficient wireless charging across a vast majority of the charging surface, ensuring devices can be charged regardless of their position, thereby enhancing charging convenience and reducing power wastage.
Implementation Method 1
A transmitter coil disposed below the charging surface may produce a time-varying magnetic field that induces a current in a corresponding receiving coil in the electronic device
Data Source
AI summary
Embodiments describe a wireless charging device including: a housing having an outer perimeter and a charging surface within the outer perimeter, the housing including a first wall and a second wall that define an interior cavity; and a transmitter coil arrangement disposed within the interior cavity and below the planar charging surface. The transmitter coil arrangement includes: a plurality of transmitter coils arranged in different layers, each transmitter coil having a first termination end, a second termination end, and a coil of wire that winds from an inner diameter to an outer diameter between the first and second termination ends; where the first termination end of each transmitter coil is disposed within the inner diameter of its respective coil of wire and the second termination end of each transmitter coil is disposed outside the outer diameter of its respective coil of wire.