Wireless Charging Power Contract Using Coupling Factor Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies in power delivery due to varying degrees of electromagnetic coupling between transmitters and receivers, leading to inaccuracies in power estimation and potential controller instability, especially when devices are misaligned or have different operating conditions.
Innovation Solution
A wireless power transmitter system that computes a coupling factor using rectifier voltage and inverter input voltage, and negotiates a power contract with the receiver based on this factor, ensuring stable power delivery by adjusting power transfer levels according to the computed coupling coefficient and stored constants specific to each receiver type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transfer is performed with varying electromagnetic coupling conditions, then power delivery can be provided to different devices, but power estimation accuracy deteriorates and controller instability occurs
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter measures the actual voltage received by the receiver and uses this information to compute the coupling factor. This feedback loop allows the system to adapt to varying coupling conditions by continuously monitoring and adjusting based on actual performance, thereby maintaining power estimation accuracy across different device configurations
Solution Approach 2:
The system dynamically changes operating parameters based on the computed coupling factor. By adjusting power delivery parameters according to the measured coupling conditions, the system maintains optimal performance across varying electromagnetic coupling scenarios while preventing controller instability
2Adaptability or versatility
If devices are misaligned or have different operating conditions, then wireless power transfer flexibility is improved, but power transfer accuracy deteriorates
Solution Approach 1:
The patent employs dynamic adjustment of power transfer parameters based on real-time coupling factor measurements. This allows the system to adapt to misalignment and varying operating conditions by continuously optimizing the power delivery parameters, thereby maintaining power transfer accuracy despite changes in device positioning or configuration
3Device complexity
If coupling factor is not computed, then system complexity is reduced, but power delivery stability deteriorates
Solution Approach 1:
The computation of coupling factor serves as a feedback mechanism that provides critical information about the electromagnetic coupling conditions. This feedback enables the controller to make informed decisions about power delivery, ensuring stability by preventing operation under suboptimal coupling conditions and allowing dynamic adjustment when conditions change
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 enhances power transfer accuracy and stability by directly measuring the coupling factor, reducing inaccuracies in power estimation and preventing controller instability, even under varying alignment and operating conditions, thus ensuring reliable power delivery to wireless devices.
Implementation Method 1
a transmitter coil that magnetically couples to the receiver coil
Data Source
AI summary
A wireless power transmitter can include an inverter that receives input power and generates an AC output voltage, a wireless power transmitter coil coupled to the AC output that magnetically couples to a corresponding coil of a wireless power receiver, and a controller and communication module. The controller and communication module can receive identifying information from the wireless power receiver, receive voltage information from the wireless power receiver, compute a coupling factor with the wireless power receiver based at least in part on the received identifying information and the received voltage information, computes a power transfer level based on the computed coupling factor, and negotiate a power contract with the wireless power receiver based at least in part on the computed power transfer level.