Wireless Power Receiver Resonant Coupling
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Solution Overview
Problem
Conventional wireless power transfer methods face inefficiencies due to rapid power coupling decline with distance and interference issues in far-field radiation, and limited charging area and close antenna spacing in inductive coupling approaches, necessitating enhanced methods for effective energy transfer to loads.
Innovation Solution
The implementation of a wireless power transfer system utilizing a near-field coupling mode between a transmitter and receiver, featuring loop antennas with resonant frequencies matched for efficient energy transfer, and a receiver circuit with a rectifier and switching elements to generate DC power, potentially eliminating the need for additional voltage regulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If plane wave radiation coupling is used between transmit and receive antennas, then wireless power transfer can be achieved, but power coupling efficiency deteriorates rapidly with distance
Solution Approach 1:
The patent changes the operating parameters by using resonant frequency matching between transmit and receive loop antennas. This resonance condition creates strong magnetic coupling that maintains efficient power transfer over distances much larger than traditional inductive coupling, directly addressing the efficiency-distance tradeoff
Solution Approach 2:
The patent employs electromagnetic resonance analogous to mechanical vibration principles, where the loop antennas are tuned to resonate at the same frequency. This resonant oscillation enhances the magnetic field coupling between antennas, allowing energy to be transferred efficiently across larger gaps compared to non-resonant approaches
2Length of stationary object
If plane wave radiation is used for wireless power transfer, then power can be transmitted over distance, but unintentional radiation causes interference with other systems
Solution Approach 1:
The patent confines the electromagnetic energy transfer to a localized near-field region using magnetic coupling between resonant loop antennas. The evanescent magnetic fields are concentrated between the transmit and receive antennas, preventing far-field radiation and interference with other electronic systems while maintaining transmission capability
3Adaptability or versatility
If inductive coupling between transmit and receive antennas is used, then multiple devices can be charged simultaneously, but antenna spacing must be very close and charging area is limited
Solution Approach 1:
The patent changes the coupling parameter from near-field inductive coupling to resonant magnetic coupling. This parameter change allows the system to maintain strong coupling over larger distances, enabling multiple devices to be charged simultaneously across a larger spatial area without requiring very close antenna proximity
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 wireless power transfer efficiency by maintaining energy coupling over larger distances and reducing interference, while potentially reducing component count and board area, thereby improving overall power delivery to loads.
Implementation Method 1
a near-field coupling mode between a transmitter and receiver
Implementation Method 2
loop antennas with resonant frequencies matched for efficient energy transfer
Implementation Method 3
a receiver circuit with a rectifier and switching elements to generate DC power
Data Source
AI summary
Exemplary embodiments are directed to conveying wireless power received at a receive antenna to a load. A method may include coupling each terminal of the antenna to a ground voltage during a charging phase for storing energy within the antenna. The method may further include coupling at least one terminal of the antenna to an output during an output phase for transferring energy from the antenna to the output.