Wireless Power Transmission Coil Segmentation for Position-Dependent Efficiency
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Solution Overview
Problem
Existing wireless power transmission devices using a single transmission coil face efficiency issues due to varying positions of the reception coil, leading to incomplete power transmission.
Innovation Solution
A wireless power transmission device employing multiple transmission coils, where a power transmission detection unit compares magnetic coupling between coils to determine the optimal coil for power transfer based on current measurements, ensuring better coupling and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmission coil is used, then the device complexity is reduced, but the power transmission efficiency deteriorates when the reception coil position changes
Solution Approach 1:
The single transmission coil is divided into multiple transmission coils (first transmission coil and second transmission coil) with different positions and sizes. This segmentation allows the system to select the most appropriate coil based on the reception coil's position, thereby maintaining high power transmission efficiency without requiring a single complex adjustable coil.
Solution Approach 2:
The system dynamically selects which transmission coil to use based on the detected position of the reception coil. The control unit switches between the first and second transmission coils according to real-time coupling conditions, making the system adaptive to position changes and maintaining optimal power transmission efficiency.
2Ease of manufacture
If a single transmission coil is used, then the manufacturing cost is reduced, but the charge region coverage deteriorates
Solution Approach 1:
Instead of manufacturing one large complex coil, the system uses multiple smaller transmission coils (first and second transmission coils) with different coverage areas. Each coil covers a specific region, and together they provide comprehensive charge region coverage while keeping individual coil manufacturing simple and cost-effective.
Solution Approach 2:
Different transmission coils are designed with different characteristics (sizes, positions) to cover different local regions. The first transmission coil covers one area while the second covers another, ensuring that the entire charge region is covered without requiring a single oversized coil.
3Device complexity
If the transmission coil is fixed, then the device complexity is reduced, but the adaptability to reception coil position changes deteriorates
Solution Approach 1:
The system employs dynamic selection between fixed transmission coils based on real-time detection of reception coil position. The control unit switches between the first and second transmission coils according to coupling detection results, providing adaptability to position changes without requiring physically adjustable coils.
Solution Approach 2:
The system uses a feedback mechanism where the detection unit continuously monitors the coupling state between transmission and reception coils. Based on this feedback, the control unit determines which transmission coil should be activated, creating a closed-loop system that adapts to position changes automatically.
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
This approach maximizes power transmission efficiency and extends the charge region by selecting the coil with higher magnetic coupling, even when the reception coil position changes, thereby improving overall power transfer efficiency and minimizing incomplete charging areas.
Implementation Method 1
a first transmission coil configured to transmit electric power to the wireless power reception device through a magnetic field
Implementation Method 2
compare magnetic coupling between the first transmission coil and a reception coil provided in the wireless power reception device with magnetic coupling between the second transmission coil and the reception coil
Data Source
AI summary
A wireless power transmission device for wirelessly transmitting power to a wireless power reception device, according to one embodiment of the present invention, comprises: a first transmission coil for transmitting power to the wireless power reception device through a magnetic field; and a second transmission coil for transmitting power to the wireless power reception device through a magnetic field and arranged on the inner side of the first transmission coil, wherein the wireless power transmission device transmits power to the wireless power reception device through one coil between the first transmission coil and the second transmission coil on the basis of a coupling state between the wireless power transmission device and the wireless power reception device.