Resonant Condition Determination for Multi-Device Wireless Power Transfer
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Solution Overview
Problem
Current wireless power transfer systems, particularly the magnetic resonance type, face challenges in determining and maintaining a resonant condition for multi-transmitter/receiver systems due to complex mutual coupling effects and varying power requirements, leading to inefficiencies in power transfer when the resonant condition is not met.
Innovation Solution
A method using a computer apparatus and program to determine and adjust the resonant condition through numerical methods, specifically by varying the operating frequency, inductance, and compensation capacitance, to maximize power transfer efficiency and meet individual receiver power requirements in multi-transmitter/receiver systems, even when system configurations change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic induction type wireless power transfer is used, then power transfer efficiency is improved through strong coupling effect, but transmission distance is limited due to significant airgap restriction
Solution Approach 1:
The patent transitions from magnetic induction type to magnetic resonance type wireless power transfer, changing the operating parameters from relying on strong coupling with minimal airgap to utilizing resonant frequency matching that allows large airgaps. This parameter change enables extended transmission distance while maintaining acceptable power transfer efficiency through resonance phenomenon.
2Length of moving object
If magnetic resonance type wireless power transfer is used, then transmission distance is improved through resonance phenomenon, but power transfer efficiency varies greatly depending on resonant condition
Solution Approach 1:
The patent implements dynamic adjustment mechanisms for inductance and capacitance values in the magnetic resonance wireless power transfer system. By dynamically tuning these parameters based on real-time coupling conditions and load requirements, the system maintains optimal resonant state across varying transmission distances and loads, thereby stabilizing power transfer efficiency while preserving extended transmission capability.
Solution Approach 2:
The patent incorporates feedback control mechanisms that monitor the resonant condition and power transfer efficiency, then adjust the inductance and capacitance parameters accordingly. This feedback loop ensures the system operates at or near optimal resonance point, compensating for variations in airgap, misalignment, and load changes to maintain consistent efficiency over extended transmission distances.
3Adaptability or versatility
If resonant condition is changed due to system configuration changes, then adaptability is improved, but power transfer efficiency drops sharply unless resonance compensation is performed
Solution Approach 1:
The patent employs dynamic parameter adjustment mechanisms that automatically adapt inductance and capacitance values in response to system configuration changes such as variations in the number of transmitters/receivers, their relative positions, and load conditions. This dynamic adaptation maintains resonant condition despite configuration changes, preventing efficiency drops while preserving system versatility.
Solution Approach 2:
The patent implements feedback control systems that detect changes in system configuration and resonant condition, then automatically adjust operating parameters to compensate. This feedback mechanism ensures continuous operation at optimal resonance point regardless of configuration variations, maintaining power transfer efficiency while enabling flexible system adaptation.
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 effectively determines and maintains optimal resonant conditions for multi-transmitter/receiver systems, ensuring stable and efficient power transfer across varying configurations and environments, thereby enhancing power transfer efficiency and flexibility.
Implementation Method 1
wireless power transfer refers to a noncontact power transfer technique in which electric energy supplied to a primary coil, for example, a transmitter, induces magnetic field energy and the induced magnetic field energy induces the electric energy again in a secondary coil
Implementation Method 2
In the case of the magnetic resonance type wireless power transfer, a power transfer efficiency may be enhanced by maximizing a coupling effect through a magnetic resonance effect although a coupling state between transmitting and receiving coils is loose
Data Source
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AI summary
Disclosed is a method of determining a magnetic resonant condition for a multi-device wireless power transfer system. A magnetic resonant condition determining method may determine a resonant condition based on a charge state, for example, a number of charging devices and a relative position between charging devices, for a multi-transmitter/receiver of a wireless power transfer system.