Wireless Charging Coil Switching for Misalignment and Heat Control
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Solution Overview
Problem
Wireless charging efficiency is reduced when the power reception device is not properly aligned with the power transmission device, leading to increased charging time and potential heat generation due to conductive areas on the coil.
Innovation Solution
A power transmission device with multiple coils and a processor that identifies misalignment conditions, switches to a more efficient coil by transmitting a coil selection packet to the power reception device, and adjusts power transmission based on signal strength packets from adjacent coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless power transmission is performed through a single coil, then the device structure is simple, but charging efficiency decreases when the power reception device is misaligned
Solution Approach 1:
The power transmission device divides the single coil into multiple separate coils arranged in different spatial positions. Each coil can independently transmit power to the power reception device. This segmentation allows the system to maintain simple individual coil structures while achieving high charging efficiency through multi-coil coordination when the reception device is misaligned.
Solution Approach 2:
The system dynamically selects and switches between different coils based on the alignment status and signal strength detected from the power reception device. The processor monitors transmission conditions and activates the most suitable coil in real-time, making the coil configuration adaptive rather than static, thereby maintaining high charging efficiency under varying alignment conditions.
2Object-affected harmful factors
If the power transmission device stops transmitting power when misalignment is detected, then heat generation is avoided, but charging time increases significantly
Solution Approach 1:
Instead of stopping power transmission entirely upon detecting misalignment, the system dynamically switches to a different coil that is better positioned for the misaligned reception device. This dynamic adaptation continues power transmission without interruption while avoiding the heat generation problems associated with forced transmission through a misaligned single coil.
Solution Approach 2:
The system changes the operational parameter by switching the active coil based on detected signal strength and alignment conditions. When misalignment is detected, the processor modifies which coil is active, thereby changing the transmission parameters to optimize both efficiency and safety, preventing excessive heat generation while maintaining charging progress.
3Productivity
If multiple coils are used for power transmission, then charging efficiency is improved through coil switching, but device complexity increases
Solution Approach 1:
The power transmission device uses multiple discrete coils positioned at different locations rather than a single complex coil structure. Each coil is relatively simple in design, but their collective arrangement provides enhanced charging efficiency. The segmentation allows independent control and selection of optimal coils without requiring a single overly complex coil system.
Solution Approach 2:
The system includes an automated processor that independently monitors signal strength from the power reception device and automatically selects the optimal coil for transmission. This self-service capability eliminates the need for manual intervention or complex external control systems, managing the multi-coil configuration automatically based on real-time conditions, thereby reducing operational complexity despite the increased hardware configuration.
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 charging efficiency by automatically selecting the most efficient coil for power transfer, reducing charging time and minimizing heat generation when the power reception device is not aligned.
Implementation Method 1
The wireless power transfer technology may include a magnetic inductive type transfer and a magnetic resonant type transfer
Implementation Method 2
identify a condition indicating a state in which a coil to transmit power related to charging of the power reception device is to be reconfigured
Data Source
AI summary
A power transmission device is provided for transmitting power. The power transmission device includes a power transmitter including a plurality of coils, and a processor configured to wirelessly transmit power to a power reception device through at least one coil among the plurality of coils, identify a condition indicating a state in which a coil to transmit power related to charging of the power reception device is to be reconfigured, transmit a CSP to the power reception device, in response to identifying the condition, based on the predetermined condition, identify an SSP of at least one other coil adjacent to at least one coil, and wirelessly transmit power to the power reception device through a coil having a largest SSP among an SSP of the at least one coil and the identified SSP of the at least one other coil.