Resonant Wireless Power Transfer for Multi-Device Charging
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Solution Overview
Problem
Existing wireless power transmission methods face challenges in providing a steady power supply to multiple devices over reasonable distances without interference, as they either suffer from distance limitations or require close antenna spacing, leading to incomplete or inaccurate charging.
Innovation Solution
The use of near-field magnetic coupling between loop antennas, with a transmitter and receiver configured in a mutual resonant relationship, allows for efficient energy transfer over larger distances and simultaneous charging of multiple devices within a defined area, using a system that includes a transmitter with a power amplifier and matching circuit, and a receiver with a rectifier and switching circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
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 changes the operating parameters by using resonant frequency matching between transmit and receive antennas. This resonance condition creates strong magnetic coupling that maintains efficient power transfer over distances much greater than traditional inductive coupling, directly resolving the contradiction between wireless transmission capability and 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 maintains energy transfer efficiency over extended distances, overcoming the rapid efficiency drop-off of non-resonant approaches
2Quantity of substance
If inductive coupling between transmit and receive antennas is used, then multiple devices can be charged simultaneously, but antenna spacing must be very close
Solution Approach 1:
The patent uses resonant frequency matching to enhance the magnetic coupling coefficient between antennas. This parameter change allows the system to maintain strong coupling over larger distances, enabling multiple devices to be charged simultaneously at practical spacing distances rather than requiring millimeter-scale proximity
Solution Approach 2:
By tuning both transmit and receive antennas to the same resonant frequency, the system creates a strongly coupled oscillating magnetic field that extends over a larger volume. This resonant enhancement allows multiple devices to be positioned within the enhanced magnetic field region and charged simultaneously at reasonable distances from the transmitter
3Length of moving object
If plane wave radiation is used for wireless power transmission, then charging distance can be extended, but unintentional radiation interferes with other systems
Solution Approach 1:
The patent creates a localized evanescent magnetic field through resonant coupling that is confined to the near-field region between the transmit and receive antennas. This localized field concentration enables extended charging distance while preventing far-field radiation that would interfere with other systems, as the magnetic field energy remains trapped in the near-field coupling region
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 reliable and efficient wireless charging of multiple devices by maintaining a stable power supply and accurate state-of-charge measurements, even at distances greater than 1-2 meters, while minimizing interference and ensuring simultaneous charging within a defined area.
Implementation Method 1
The use of near-field magnetic coupling between loop antennas, with a transmitter and receiver configured in a mutual resonant relationship
Implementation Method 2
with a transmitter and receiver configured in a mutual resonant relationship
Data Source
AI summary
Exemplary embodiments are directed to wireless power. A method may comprise receiving wireless power with a receiver and charging an accumulator with energy from the received wireless power. The method may further include conveying energy from the accumulator to an energy storage device upon a charging level of the accumulator reaching a threshold level.