Wireless Charging Coil Frequency Sweeping for Misalignment
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Solution Overview
Problem
Conventional wireless power systems face limitations due to the need for close proximity and precise alignment of coils, as well as inefficiencies caused by static resonant frequencies, which restrict their applicability and increase production costs.
Innovation Solution
The implementation of an active driving frequency sweeping and impedance tuning system (ADFS) that dynamically adjusts the operating frequency to maximize energy transfer efficiency, using feedback mechanisms to compensate for varying loads, temperatures, and misalignments between coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static resonant frequency is used in conventional wireless power systems, then the system design is simplified, but energy transfer efficiency severely degrades when distance or alignment varies
Solution Approach 1:
The patent implements dynamic frequency tuning by continuously adjusting the resonant frequency of the transmitter coil to match the receiver coil's frequency. This dynamic adaptation allows the system to maintain optimal energy transfer efficiency across varying distances and alignments, resolving the contradiction between simplified static design and efficient dynamic operation
Solution Approach 2:
The system employs feedback mechanisms where the receiver coil communicates its resonant frequency and coupling status back to the transmitter. This feedback enables real-time frequency adjustment and impedance matching, ensuring maximum energy transfer efficiency while maintaining relatively simple system architecture
2Loss of energy
If precise alignment and close proximity are required between coils, then energy transfer efficiency is maximized, but the system's applicability and flexibility are severely limited
Solution Approach 1:
The patent uses dynamic frequency adjustment and impedance matching to maintain optimal coupling conditions across varying distances and alignments. By continuously adapting the transmitter's resonant frequency and impedance parameters, the system achieves high efficiency over extended ranges and with misaligned coils, thereby expanding applicability without sacrificing energy transfer efficiency
Solution Approach 2:
The system dynamically changes key parameters including resonant frequency, impedance, and coupling coefficients to optimize energy transfer under varying conditions. This parameter adaptation enables the system to maintain high efficiency across different distances, orientations, and load conditions, significantly improving versatility while preserving energy transfer performance
3Loss of energy
If high-Q factor coils are used in magnetic resonant coupling, then energy transfer efficiency depends heavily on frequency matching, but production costs increase to maintain precise static natural frequencies
Solution Approach 1:
The patent replaces the need for precisely manufactured static high-Q coils with dynamically tunable coils that can adjust their resonant frequency electronically. This dynamic approach allows the use of more manufacturable coils with broader frequency ranges, reducing production costs while maintaining high energy transfer efficiency through real-time frequency matching
Solution Approach 2:
The system changes the resonant frequency parameter dynamically through electronic control rather than relying on precise mechanical manufacturing tolerances. This parameter modulation approach enables the use of cost-effective coils that can be tuned to match frequencies, significantly reducing production costs while preserving the high efficiency benefits of magnetic resonant coupling
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 the efficiency and flexibility of wireless energy transfer systems, allowing for more efficient power delivery across a range of conditions and distances without the need for precise static resonant frequencies, thus expanding their applicability and reducing production costs.
Implementation Method 1
A control adjusts an operating parameter of the transmitter coil to compensate for changes in a coupling between the transmitter coil and the receiver coil
Implementation Method 2
In magnetic resonant coupling based wireless charging systems, energy transfer efficiency heavily depends on how the driving frequency, the transmitter resonant frequency and the receiver resonant frequency match each other
Data Source
AI summary
A system includes at least one active energy transfer coil and a first passive energy transfer coil. The active energy transfer coil is configured to couple with a power supply. The at least one active energy transfer coil has an active coupling range. The first passive energy transfer coil is magnetically coupled to the active energy transfer coil and is located within the active coupling range. The first passive energy transfer coil has a passive coupling range. The first passive energy transfer coil is configured to provide energy to a first device located within the passive coupling range and based on energy received from the at least one active energy transfer coil.