Wireless Power Transfer via Near-Field Resonance
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Solution Overview
Problem
Existing wireless charging technologies face challenges in efficiently charging multiple devices over reasonable distances and minimizing interference, with far-field radiation losing power quickly with distance and inductive coupling requiring close antenna spacing, limiting charging area and efficiency.
Innovation Solution
A wireless power transfer system utilizing near-field resonance between loop antennas, allowing for efficient energy transfer over larger distances and multiple device charging by matching resonant frequencies and using load sensing and communication protocols to optimize energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If plane wave radiation coupling is used for wireless charging, then charging distance can be extended beyond very close proximity, but power coupling efficiency drops quickly with distance and unintentional radiation interference occurs
Solution Approach 1:
The patent changes the operating parameters by using resonant frequency matching between transmit and receive antennas. This resonance condition creates strong magnetic coupling that maintains high power transfer efficiency over distances significantly greater than traditional inductive coupling, directly resolving the contradiction between extended charging distance and maintained power coupling efficiency
Solution Approach 2:
The patent employs electromagnetic resonance, which is analogous to mechanical vibration principles, where the transmit and receive antennas are tuned to the same resonant frequency. This resonant oscillation creates enhanced magnetic field coupling that overcomes the rapid efficiency drop-off characteristic of non-resonant plane wave radiation, enabling efficient power transfer at extended distances
2Length of stationary object
If plane wave radiation is used for wireless charging, then charging distance is extended, but unintentional radiation interference with other systems occurs
Solution Approach 1:
The patent confines the electromagnetic energy transfer to a localized near-field region through resonant coupling. The evanescent magnetic fields are concentrated between the resonant antennas rather than radiating outward as plane waves, creating a localized charging zone that eliminates broad-spectrum radiation interference with other electronic systems while maintaining extended charging distance
3Quantity of substance
If inductive coupling between transmit antenna and receive antenna is used, then multiple devices can be charged simultaneously, but spacing between antennas must be very close and charging area is limited
Solution Approach 1:
The patent changes the coupling mechanism from near-field inductive coupling to resonant magnetic coupling at matched frequencies. This parameter change enables the system to charge multiple devices simultaneously at extended distances from the transmit antenna, as the resonant condition maintains strong coupling over much larger spatial separations than traditional inductive methods
Solution Approach 2:
The resonant charging system provides multi-functionality by simultaneously supporting charging of multiple devices at various positions and orientations within the extended charging area. The system can adapt to different device types and locations while maintaining efficient power transfer, making the charging solution universally applicable across diverse scenarios
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
Enables efficient wireless charging of multiple devices over larger areas with reduced interference, optimizing energy transfer and charging efficiency through near-field resonance and adaptive power management.
Implementation Method 1
A wireless power transfer system utilizing near-field resonance between loop antennas, allowing for efficient energy transfer over larger distances
Implementation Method 2
Other approaches are based on inductive coupling between a transmit antenna embedded, for example, in a 'charging' mat or surface and a receive antenna plus rectifying circuit embedded in the host device to be charged
Data Source
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AI summary
Exemplary embodiments are directed to wireless power. A method may comprise detecting one or more transmit elements positioned within an associated charging region. The method may further comprise selecting at least one transmit element of the detected one or more transmit elements to receive wireless power therefrom to enable for optimal charging of a charging device.