Wireless Charging Coil with Segmented PCB Patterns
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Solution Overview
Problem
Existing wireless charging technologies primarily focus on receiving power and lack the capability to efficiently transmit power to other electronic devices without a charging adapter or pad, especially for devices with low battery capacity, such as watches and earbuds.
Innovation Solution
A wireless charging coil design featuring a printed circuit board with spiral-shaped coil patterns and through-holes, allowing for both power reception and transmission, with a processor controlling the power transfer based on the proximity of other devices, enabling the electronic device to wirelessly charge other devices with insufficient battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless charging coil is designed for power reception only, then power reception efficiency is improved, but the capability to transmit power to other electronic devices is lost
Solution Approach 1:
The wireless charging coil is designed to perform both power reception and power transmission functions. The coil structure includes first and second coil patterns that can operate in both modes, enabling the electronic device to receive power wirelessly and also transmit power to other devices such as watches and earbuds without requiring a separate charging adapter
2Ease of manufacture
If a simple coil pattern is used, then manufacturing complexity is reduced, but current distribution uniformity and magnetic field uniformity deteriorate
Solution Approach 1:
The coil pattern is divided into multiple segments including first coil patterns and second coil patterns with different winding directions. The first coil pattern includes first and second coil patterns wound in opposite directions, and the second coil pattern includes third and fourth coil patterns wound in opposite directions. This segmentation allows for better current distribution while maintaining manufacturing simplicity through standardized patterning processes
3Volume of moving object
If coil patterns are wound tightly to reduce size, then device compactness is improved, but equivalent series resistance increases
Solution Approach 1:
The coil patterns are designed with varying local characteristics where the winding density and trace width are optimized at different positions. The first and second coil patterns have different winding directions and local geometries that collectively reduce the overall equivalent series resistance while maintaining a compact form factor suitable for mobile devices
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 power transmission and reception, improving current distribution, reducing equivalent series resistance and parasitic capacitance, and effectively charging devices like watches and earbuds with low battery levels.
Implementation Method 1
the wireless charging method may include an electromagnetic inductive method
Implementation Method 2
capable of uniformly forming a magnetic field
Data Source
AI summary
According to embodiments, a wireless charging coil and an electronic device including the same are provided. The electronic device may include a battery; a wireless charging coil; a wireless charging circuit configured to wirelessly transmit and/or receive power using the wireless charging coil; and a processor electrically connected to the battery, the wireless charging coil, and the wireless charging circuit, wherein based on another electronic device being positioned within a specified transmission and/or reception distance of the electronic device, the processor is configured to control the electronic device to transmit power stored in the battery to the other electronic device using the wireless charging coil and the wireless charging circuit. Therefore, the electronic device can wirelessly charge another electronic device, a watch, and an earbud in which the remaining battery capacity is insufficient.