Layered Wireless Charging Coil for Uniform Current Density
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Solution Overview
Problem
Wireless charging coils experience uneven current density distribution, leading to increased AC effective impedance and reduced charging efficiency due to skin and proximity effects.
Innovation Solution
A wireless charging coil design featuring spirally wound first and second wires with alternating layers and interconnected wire parts, ensuring even current density distribution across the coil, thereby reducing AC effective impedance and enhancing charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flows through a conventional wireless charging coil, then wireless charging function is achieved, but current density is distributed unevenly due to skin effect and proximity effect
Solution Approach 1:
The coil structure is divided into multiple segments along the current flow direction, with each segment having progressively adjusted parameters. This segmentation allows different portions of the coil to compensate for skin effect and proximity effect variations, achieving more uniform current density distribution across the entire coil.
Solution Approach 2:
Different segments of the coil are designed with locally optimized characteristics, such as varying wire diameters, turn densities, or spacing patterns. This local quality adjustment ensures that each segment contributes appropriately to the overall magnetic field generation while maintaining uniform current density despite skin and proximity effects.
2Reliability
If current flows through the wireless charging coil, then charging function is provided, but AC effective impedance increases due to reduced effective area
Solution Approach 1:
The coil is segmented into multiple sections with progressively adjusted parameters along the current path. This segmentation increases the effective area by distributing current more evenly across different segments, thereby reducing the overall AC effective impedance while maintaining the charging function.
Solution Approach 2:
Physical parameters of the coil segments are changed progressively, such as adjusting wire diameter, turn spacing, or winding density in different segments. These parameter changes optimize the current distribution and increase the effective area, leading to reduced AC effective impedance.
3Device complexity
If conventional coil design is used, then simple structure is maintained, but charging efficiency is reduced
Solution Approach 1:
The coil structure is segmented into multiple sections with progressively adjusted parameters, which improves charging efficiency by achieving more uniform current density distribution. This segmentation approach balances structural complexity with performance enhancement.
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
The design achieves improved current density distribution and reduced AC effective impedance, resulting in increased charging efficiency and effectiveness.
Implementation Method 1
wireless charging coil through which a current flows
Implementation Method 2
due to a skin effect and a proximity effect, when a current flows through a wireless charging coil, a current density is distributed unevenly
Implementation Method 3
due to a skin effect and a proximity effect, when a current flows through a wireless charging coil, a current density is distributed unevenly
Data Source
Figure 1~2
Figure 3~4
AI summary
A wireless charging coil and a terminal device. The wireless charging coil includes: a first wire (1) and a second wire (2), and the first wire (1) and the second wire (2) are both spirally wound into coils. The first wire (1) includes a first wire part (11) and a second wire part (12) that are connected to each other, and the second wire (2) includes a third wire part (21) and a fourth wire part (22) that are connected to each other. The first wire part (11) is located in a first layer, the second wire part (12) is located in a second layer, the third wire part (21) is located in the first layer, and the fourth wire part (22) is located in the second layer. The first layer and the second layer are two adjacent layers.