Wireless Charging Coil Alignment With Matched Electromagnetic Coils
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Solution Overview
Problem
The use of magnets to align coils in wireless charging devices increases the weight and volume, and weak magnetization can deteriorate the alignment performance, especially during fast-charging.
Innovation Solution
Employing first and second coils in the power transmission and reception coils of the wireless charging device and electronic device, respectively, as electromagnets to align and omit the need for a magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a magnet is used to align the coil of the wireless charging device and the coil of the electronic device, then the alignment performance is improved, but the weight and volume of the wireless charging device increase
Solution Approach 1:
The patent replaces the permanent magnet alignment mechanism with an electromagnetic field-based alignment mechanism. The wireless charging device uses its power transmission coil to generate an electromagnetic field that interacts with the power reception coil in the electronic device, creating an attractive force that aligns the coils without requiring physical magnets in the charging device.
Solution Approach 2:
The power transmission coil in the wireless charging device serves dual functions: it performs wireless power transmission and simultaneously generates the electromagnetic field required for coil alignment. This eliminates the need for separate alignment components, reducing both weight and volume while maintaining alignment capability.
2Manufacturing precision
If a magnet is used to align the coil of the wireless charging device and the coil of the electronic device, then the alignment performance is improved, but the device complexity increases
Solution Approach 1:
The power transmission coil performs both wireless power transmission and electromagnetic alignment functions simultaneously, eliminating the need for separate alignment components and reducing overall device complexity.
Solution Approach 2:
The wireless charging device uses its own power transmission coil to generate the electromagnetic field needed for alignment, rather than requiring external alignment mechanisms or additional components. The system aligns itself through the inherent electromagnetic interaction between transmitter and receiver coils.
3Productivity
If fast-charging is performed using the wireless charging device, then the charging speed is improved, but the alignment performance deteriorates when magnetization weakens
Solution Approach 1:
The alignment mechanism is dynamic and adaptive, using real-time electromagnetic field interaction to maintain coil alignment during fast-charging operations. The electromagnetic attraction force between the power transmission coil and power reception coil adjusts automatically to maintain optimal alignment even under varying charging conditions and temperatures.
Solution Approach 2:
Replacing the static permanent magnet alignment system with a dynamic electromagnetic field-based system allows the alignment to be actively maintained during fast-charging, overcoming the limitations of weak magnetization that occur with permanent magnets under high thermal and electrical stress.
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
Improves attachment force for aligning the coils, reducing the device's weight and volume while maintaining effective alignment.
Implementation Method 1
the electromagnetic induction method uses the magnetic field generated by coils to wirelessly transmit power from a wireless charging device
Implementation Method 2
power is supplied to a power reception coil disposed inside the electronic device through a power transmission coil disposed inside the charging device, thereby charging the battery of the electronic device
Data Source
AI summary
An electronic device including a wireless charging device is provided. The wireless charging device includes a power transmission coil for wirelessly transmitting power to the electronic device, and a first coil which is disposed inside the power transmission coil and by which a magnetic field is formed in a first direction. The electronic device includes a power reception coil for wirelessly receiving power from the power transmission coil, and a second coil which is disposed inside the power reception coil and by which a magnetic field is formed in a second direction opposite the first direction, wherein the first coil and the second coil are configured to be matched so that the power transmission coil and the power reception coil are aligned.