Multilayer Wireless Charging Coil Layout for Lower AC Impedance
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Solution Overview
Problem
Wireless charging coils experience uneven current density distribution due to skin and proximity effects, leading to increased AC effective impedance and low charging efficiency.
Innovation Solution
A wireless charging coil design featuring spirally wound first and second wires with interconnected parts across adjacent layers, ensuring even current density distribution by optimizing the placement of wire parts within the coil layers to mitigate these effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flows through a 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 wireless charging coil is divided into multiple independent wire segments (first wire part, second wire part, third wire part, fourth wire part) arranged in different layers. Each segment carries current independently, which breaks the continuous current path that causes uneven density distribution due to skin and proximity effects.
Solution Approach 2:
The patent transitions from a single-layer coil structure to a multi-layer structure with wires distributed across different spatial dimensions (first layer and second layer). This dimensional change allows current to flow through multiple spatial paths, reducing the concentration of current density in any single region.
2Reliability
If current flows through a wireless charging coil, then wireless charging is enabled, but AC effective impedance increases due to reduced effective area
Solution Approach 1:
By segmenting the coil into multiple wire parts across different layers, the total effective cross-sectional area for current flow is increased. Each wire part contributes to the overall effective area, reducing the AC effective impedance compared to a single continuous wire.
Solution Approach 2:
The multi-layer arrangement effectively utilizes three-dimensional space, increasing the effective area through which current can flow. This spatial distribution reduces the impedance by providing multiple parallel current paths across different layers.
3Productivity
If current flows through a wireless charging coil, then charging is performed, but charging efficiency is reduced due to increased impedance
Solution Approach 1:
Segmenting the coil into multiple wire parts reduces the overall AC effective impedance, which directly improves charging efficiency by reducing energy losses. Each segment contributes to lowering the total impedance through their distributed arrangement.
Solution Approach 2:
By distributing wires across multiple layers in the vertical dimension, the patent increases the effective conducting area and reduces impedance, thereby improving charging efficiency and reducing energy loss during the wireless charging process.
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 reduces AC effective impedance and enhances charging efficiency by achieving more even current density distribution across the coil, thereby improving the overall efficiency of wireless charging.
Implementation Method 1
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 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
the first wire and the second wire are both spirally wound into coils
Data Source
AI summary
A wireless charging coil includes a first wire and a second wire, and the first wire and the second wire are both spirally wound into coils. The first wire includes a first wire part and a second wire part that are connected to each other, and the second wire includes a third wire part and a fourth wire part that are connected to each other. The first wire part is located in a first layer, the second wire part is located in a second layer, the third wire part is located in the first layer, and the fourth wire part is located in the second layer. The first layer and the second layer are two adjacent layers.