Adaptive Wireless Power Transfer Using Dynamic Transmitter Coil Control
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Solution Overview
Problem
Current wireless power transfer systems are limited by the need for precise alignment and fixed distances between charging pads and devices, and they struggle to adapt to changing configurations of receivers, such as varying numbers, locations, and loads, which can disrupt optimal power transfer.
Innovation Solution
A method for adaptive wireless power transfer using multiple controlled transmitter coils that continuously monitor and adjust their excitation based on the changing configuration of receiver coils, including their location, load, and magnetic coupling, without requiring communication between transmitters and receivers, ensuring optimal or near-optimal power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transfer uses fixed transmitter coils with static configuration, then the system structure is simple, but it cannot adapt to changing receiver locations, numbers, and loads
Solution Approach 1:
The patent implements dynamic control of transmitter coils by continuously adjusting their excitation states based on real-time detection of receiver configurations. The system transitions from static to dynamic operation by monitoring changes in receiver number, location, and load, and相应地 adjusting which transmitter coils are active and their excitation parameters, thereby achieving adaptability without requiring complex mechanical reconfiguration
Solution Approach 2:
The system employs feedback mechanisms where the response of transmitter coils to periodic excitation is measured and used to update data characterizing the electrical effect of receiver coils. This closed-loop feedback enables the system to detect changes in receiver configuration and adapt its power transfer strategy accordingly, resolving the contradiction between simplicity and adaptability
2Productivity
If the system continuously monitors and adjusts transmitter coil excitation to maintain optimal power transfer, then power transfer efficiency is maximized, but computational and control complexity increases
Solution Approach 1:
Rather than continuously adjusting all transmitter coils at full complexity, the system applies partial action by selectively exciting only the necessary subset of transmitter coils based on current receiver needs. The control complexity is reduced by applying excitation only where and when needed, maintaining high power transfer efficiency while avoiding unnecessary computational overhead
Solution Approach 2:
The system optimizes power transfer by changing parameters such as the excitation frequency, amplitude, and phase of transmitter coils based on detected receiver conditions. By dynamically adjusting these parameters rather than maintaining fixed operation, the system achieves high efficiency while the parameter-based control framework keeps computational complexity manageable
3Adaptability or versatility
If multiple transmitter coils are used to serve multiple receivers, then the system can handle varying receiver configurations, but the difficulty of detecting and measuring system state increases
Solution Approach 1:
The patent divides the wireless power transfer system into multiple independent transmitter coils, each capable of being individually controlled and monitored. This segmentation allows the system to handle multiple receivers simultaneously while simplifying detection by treating each coil-receiver interaction as a separate, manageable unit rather than a complex coupled system
Solution Approach 2:
The system uses the electrical response of transmitter coils as an intermediary indicator of receiver presence and state. By measuring the electrical effect (such as impedance changes or current response) of each transmitter coil, the system can indirectly detect receiver configuration without requiring direct communication or complex sensing mechanisms, thus reducing measurement difficulty
4Reliability
If the system adapts to changing load conditions of receivers, then power distribution fairness is improved, but the response time and control complexity increase
Solution Approach 1:
The system maintains continuous monitoring and adjustment of transmitter coil excitation to track changing receiver load conditions. By operating continuously rather than in discrete steps, the system ensures fair power distribution is maintained at all times while minimizing response delays. The continuous adaptation process prevents power distribution inequities from developing, thereby achieving fairness without significant time loss
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 allows for continuous and fair power transfer to multiple receivers, prioritizing devices with lower battery levels, while maintaining efficiency and adaptability to changing geometries and loads, without the need for explicit communication or interruption of power delivery.
Implementation Method 1
Power is transferred using magnetic fields generated in transmitting coils in the charging pad and received at a receiving coil in the device being charged
Implementation Method 2
Power is transferred using magnetic fields generated in transmitting coils in the charging pad and received at a receiving coil in the device being charged
Data Source
AI summary
A method for wireless power transfer adapts to changing configuration of receivers, including changes in number of, location and/or orientiation of, magnetic coupling to, and load of circuits (e.g., battery charging circuits) of one or more receivers. The adaptation can be performed without interrupting optimal or near-optimal power transfer to the receivers, and can provide a measure of fairness among multiple receivers.