Wireless Power Transmitter Coil Switching for Position Drift
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Solution Overview
Problem
Wireless power transmission efficiency deteriorates due to changes in the relative positions of the wireless power transmission and receiving apparatuses, leading to potential power interruptions and heat generation in the receiving apparatus.
Innovation Solution
A method and apparatus that detect movement of the receiving apparatus during power transmission using magnetic inductive coupling, and dynamically switch between multiple primary coils to maintain optimal power transfer by selecting the resonance circuit based on signal strength messages, ensuring stable power delivery without efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single primary coil is used for power transmission, then the device complexity is reduced, but power transmission efficiency deteriorates when relative positions change
Solution Approach 1:
The transmitting apparatus is divided into multiple primary coils (first primary coil and second primary coil) that can be independently controlled. This segmentation allows the system to switch between different coils based on the receiving apparatus position, maintaining high transmission efficiency without requiring a single complex adaptive coil structure.
Solution Approach 2:
The system dynamically switches between different primary coils based on real-time detection of receiving apparatus position and magnetic inductive coupling strength. This dynamic adaptation allows the system to maintain optimal power transmission efficiency as the receiving apparatus moves, rather than using a fixed single-coil configuration.
2Device complexity
If the primary coil is fixed after initial recognition, then the control complexity is reduced, but power transmission stability deteriorates when the receiving apparatus moves
Solution Approach 1:
The system continuously monitors the magnetic inductive coupling between the primary coils and the receiving apparatus, using this feedback to determine when to switch between primary coils. This feedback mechanism ensures stable power transmission by adapting to position changes while maintaining manageable control complexity through automated decision-making based on coupling strength thresholds.
3Loss of energy
If magnetic inductive coupling is performed with multiple primary coils continuously, then power transmission efficiency is maintained, but energy consumption increases
Solution Approach 1:
The system performs magnetic inductive coupling tests with multiple primary coils only when movement is detected, rather than continuously monitoring all coils at full power. This partial action approach maintains transmission efficiency when needed while reducing energy consumption during stable positioning, balancing efficiency and energy use.
4Adaptability or versatility
If the receiving apparatus moves during power transmission, then adaptability is improved, but power transmission efficiency deteriorates
Solution Approach 1:
The system dynamically detects receiving apparatus movement and switches between primary coils to maintain optimal magnetic inductive coupling. This dynamic adaptation allows the system to accommodate position changes (improving adaptability) while maintaining high transmission efficiency by always using the most appropriate primary coil for the current position.
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 stabilizes power transmission and prevents excessive heat generation by adaptively selecting the most efficient primary coil, maintaining high efficiency even when the relative positions of the apparatuses change, thus ensuring reliable and efficient wireless power transfer.
Implementation Method 1
wirelessly transmitting the power to the receiving apparatus through magnetic inductive coupling
Implementation Method 2
an inverter for converting DC power into AC power
Data Source
AI summary
Disclosed are an apparatus and a method for transmitting power wirelessly. The method for transmitting power wirelessly includes: detecting whether a receiving apparatus moves while wirelessly transmitting the power to the receiving apparatus through magnetic inductive coupling; performing the magnetic inductive coupling with the receiving apparatus for each of two or more primary coils when it is detected that the receiving apparatus moves; and determining whether to change the primary coil connected with the receiving apparatus based on a result of the magnetic inductive coupling. A signal strength message received from the receiving apparatus is received and stored every primary coil magnetically inductively coupled with the receiving apparatus, and it is determined that the received apparatus is connected through a primary coil corresponding to a largest value among signal strength values included in the signal strength message.