Segmented Wireless Charging Coil Layout for Tight Device Space
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Solution Overview
Problem
The challenge of miniaturization in electronic devices limits the available space for wireless power transmission coils, affecting charging efficiency and power transfer.
Innovation Solution
A wireless power transmission coil design with distinct sections having varying thickness and width, achieved by alternating winding methods, ensuring efficient use of space while maintaining charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the wireless power transmission coil is continuously wound with uniform dimensions, then the manufacturing process is simple, but the space utilization within the electronic device is insufficient
Solution Approach 1:
The coil is divided into multiple winding sections along the winding direction, where each section has different winding parameters (thickness, width). This segmentation allows the coil to adapt to limited space while maintaining sufficient active area for power transmission, resolving the contradiction between space utilization and structural simplicity.
Solution Approach 2:
Different sections of the coil are designed with locally optimized winding characteristics - some sections have greater thickness while others have greater width, depending on the available space in different regions. This local differentiation maximizes the coil's effective area within the constrained three-dimensional space of the electronic device.
2Productivity
If the coil dimensions are reduced to fit limited space, then the device becomes more compact, but the charging efficiency decreases
Solution Approach 1:
The coil design transitions from a two-dimensional planar structure to a three-dimensional multi-layer structure with varying thickness and width. By utilizing the third dimension (stacking layers with different dimensions), the coil achieves sufficient active area for high charging efficiency while maintaining a compact footprint that fits within limited device space.
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 allows for a larger coil area within constrained spaces, enhancing charging efficiency and power transfer without reducing the overall coil area significantly.
Implementation Method 1
In the widely used electromagnetic induction-based wireless charging system, an alternating current of a specific frequency is supplied to the transmitter coil at the power transmitter end. Through electromagnetic induction, this induces a corresponding current in the receiver coil at the power receiver end, thereby transferring energy from the power transmitter end to the power receiver end.
Data Source
AI summary
A wireless power transmission coil, a coil assembly, and an electronic device are disclosed. By dividing the continuously wound wireless power transmission coil into a first section and a second section arranged along the circumferential direction, and employing different winding methods in the first and second sections, the first section has a first maximum thickness, and the second section has a second maximum thickness that greater than the first maximum thickness. From the outer edge to the inner edge, the first section has a first width, and the second section has a second width that is less than the first width. This allows the dimensions of the wireless power transmission coil to be adjusted to fit the space constraints within the electronic device while ensuring that the area of the wireless power transmission coil is not excessively reduced, thereby maintaining the charging efficiency of wireless charging.