Wireless Power Transfer Using Repeater Antennas
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Solution Overview
Problem
Current wireless charging technologies face challenges in efficiently charging multiple devices over reasonable distances due to rapid power coupling decline with distance and interference issues, and they require precise placement and orientation of antennas, limiting flexibility and scalability.
Innovation Solution
The development of a wireless power transfer system using loop antennas with near-field coupling, where a large transmit antenna with repeater antennas enhances coupling efficiency and flexibility by reshaping the coupling mode region, allowing for efficient energy transfer over larger areas and varied device placements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If plane wave radiation coupling is used between transmit and receive antennas, then wireless power transmission can be achieved, but power coupling efficiency drops quickly with distance
Solution Approach 1:
The patent introduces a repeater antenna as an intermediary element between the transmit antenna and receive antenna. The repeater antenna receives power wirelessly from the transmit antenna and re-transmits it to the receive antenna, enabling power transmission over extended distances while maintaining coupling efficiency. This mediator approach allows the system to overcome the rapid efficiency drop that occurs with direct long-distance coupling.
2Quantity of substance
If inductive coupling between transmit and receive antennas is used, then multiple devices can be charged simultaneously, but the spacing between antennas must be very close
Solution Approach 1:
The patent divides the wireless power transmission system into segmented components: a transmit antenna, one or more repeater antennas, and receive antennas. Each segment operates at optimized spacing distances, with the repeater antenna positioned to maintain strong coupling with both the transmit antenna and receive antenna. This segmentation allows multiple devices to be charged simultaneously at practical distances rather than requiring extremely close spacing.
3Loss of energy
If resonant length antennas are used to improve coupling efficiency, then unintentional radiation can interfere with other systems
Solution Approach 1:
The patent employs loop antennas with specific geometric configurations and dimensions optimized for near-field coupling rather than far-field radiation. The loop antenna structure creates concentrated magnetic fields in the near-field region, providing strong coupling efficiency over short distances while minimizing far-field radiation. This local field concentration approach maintains efficiency without generating harmful interference to other systems.
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 solution achieves high coupling efficiency and flexibility, enabling wireless charging of multiple devices at larger distances and varied orientations, reducing the need for precise placement and increasing the charging area, while also integrating renewable energy sources for power generation.
Implementation Method 1
a transmit antenna is configured to wirelessly transmit power to a receive antenna within an associated near-field
Implementation Method 2
one or more repeater antennas are disposed within a perimeter of the transmit antenna and are coupled to the transmit antenna
Data Source
AI summary
Exemplary embodiments are directed to wireless charging. A charging system may comprise at least one power generation system configured to convert renewable energy to another form of energy and convey the another form of energy. The charging system may further include at least one transmit antenna coupled to the at least one power generation system and configured to receive the another form of energy from the at least one power generation system. Further, the at least one transmit antenna is configured to wirelessly transmit energy to at least one other antenna positioned within an associated coupling-mode region.