Auxiliary Circuits for Multi-Frequency Wireless Power Transfer
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Solution Overview
Problem
Current multi-frequency wireless power transfer systems face limitations in controlling power transfer rates at different frequencies, leading to cross interference and reduced efficiency due to high quality factors and the need for widely separated frequencies, which increases costs and technical constraints.
Innovation Solution
Incorporating auxiliary circuits with band-pass and/or band-stop filters into receiver and relay circuits to selectively enhance power transfer to targeted loads while minimizing cross interference, allowing non-targeted receivers to act as relay resonators and utilize indirect power paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-frequency wireless power transfer is implemented without auxiliary filtering circuits, then power transfer rate is enhanced, but cross interference between non-targeted receivers increases
Solution Approach 1:
Band-pass and band-stop filtering circuits are introduced as intermediary elements in the receiver circuits to selectively pass or block specific frequency components. These filtering circuits act as mediators that allow the multi-frequency power transfer to proceed while preventing cross interference between differently tuned receivers, thus resolving the contradiction between enhanced power transfer and reduced interference.
2Object-affected harmful factors
If widely separated frequencies are used for multi-frequency power transfer, then cross interference is reduced, but technical and cost constraints on transmitter and coil resonator design increase
Solution Approach 1:
Filtering circuits are introduced as intermediary elements that enable the use of closely spaced frequencies by selectively passing or blocking specific frequency components. This eliminates the need for widely separated frequencies, thereby reducing technical and cost constraints on transmitter and resonator design while still preventing cross interference.
Solution Approach 2:
The invention changes the frequency selection parameters by allowing closely spaced frequencies to be used instead of widely separated ones. The filtering circuits enable this parameter change by providing frequency selectivity, thus allowing the system to operate with more flexible and less constrained frequency choices.
3Object-affected harmful factors
If high quality factors are used in resonators to reduce cross interference, then power transfer efficiency improves, but system cost increases
Solution Approach 1:
Filtering circuits are introduced as cost-effective intermediary elements that provide frequency selectivity without requiring extremely high quality factor resonators. These filtering circuits achieve cross interference reduction through selective frequency passing and blocking, thereby reducing system cost while maintaining power transfer efficiency.
4Ease of operation
If independent control of power transfer rates at different frequencies is required, then selective power transfer to targeted receivers is achieved, but system complexity increases
Solution Approach 1:
The power transfer control is segmented into frequency-specific channels with dedicated filtering circuits for each receiver. Each receiver circuit includes filtering elements that are tuned to specific frequencies, enabling independent control of power transfer rates at different frequencies. This segmentation approach achieves selective control while keeping each control channel relatively simple.
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 enables simultaneous multi-frequency power transfer to multiple targeted loads with reduced cross interference and improved efficiency, allowing for the use of closer operating frequencies and optimizing power transfer paths, thereby enhancing overall system performance.
Implementation Method 1
wireless power transfer technology has re-emerged as a viable technology for domestic and industrial applications
Implementation Method 2
multi-resonant tanks are used at the transmitter and receiver to amplify and extract power at multiple frequencies
Implementation Method 3
Incorporating auxiliary circuits with band-pass and/or band-stop filters into receiver and relay circuits to selectively enhance power transfer
Data Source
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Figure 5~6D
AI summary
This invention is related to a novel method and apparatus that provides selective and enhanced power flow in wireless power transfer systems with multiple receivers. Auxiliary circuits are introduced in the receiver circuits (and relay circuits if applicable) so as to ensure proper frequency-selective wireless power flow to the appropriate targeted receivers, with the pickup power by the non-targeted receivers substantially reduced even if the chosen tuned frequencies for different receivers are not widely apart.