Cavity Resonator Wireless Power Transfer With Stable Resonance
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in maintaining efficiency and resonance frequency stability due to varying arrangements and objects within cavity resonators, leading to reduced power transmission and reception efficiency.
Innovation Solution
A wireless power transfer system with a structure surrounded by an electromagnetic wave shielding member, incorporating series-connected resonators and resonant networks, including capacitors and LC parallel resonators, to maintain efficiency and broaden the frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a cavity resonator is used for wireless power transfer, then power transmission efficiency is improved, but resonance frequency stability deteriorates when objects are placed inside the cavity
Solution Approach 1:
The patent applies dynamics by making the resonant network adjustable and adaptable to changing conditions. The resonant network includes variable capacitors or tunable elements that allow the resonance frequency to be dynamically adjusted when objects are placed inside the cavity, maintaining both power transmission efficiency and frequency stability through active adaptation rather than fixed parameters.
Solution Approach 2:
The patent changes the parameter of resonance frequency dynamically by incorporating a resonant network with adjustable capacitance or inductance values. This allows the system to adapt the resonance frequency based on the presence and position of objects within the cavity, resolving the contradiction between maintaining efficiency and ensuring frequency stability under varying conditions.
2Loss of energy
If the resonance frequency is predetermined for power transmission, then power transmission efficiency is improved, but adaptability to varying environments deteriorates
Solution Approach 1:
The system transitions from static predetermined resonance frequency to dynamic adjustable resonance frequency through the resonant network. This allows the system to maintain high power transmission efficiency while adapting to varying environmental conditions, object placements, and cavity configurations by tuning the resonance frequency in real-time.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the actual resonance conditions within the cavity and adjust the resonant network parameters accordingly. This feedback loop enables the system to maintain optimal power transmission efficiency while adapting to changing environmental factors, object positions, and cavity loading conditions.
3Device complexity
If conductor line dimensions are reduced, then device complexity is reduced, but frequency band width deteriorates
Solution Approach 1:
The patent employs composite resonant structures combining multiple resonant elements (LC parallel resonators, series resonators) that work together to achieve broad frequency band coverage. This composite approach allows the use of compact conductor lines while maintaining wide frequency band width through the synergistic interaction of multiple resonant modes and frequency-selective networks.
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
The system achieves stable power transmission and reception efficiency by broadening the frequency band and reducing conductor line dimensions, adapting to varying environments and objects within cavity resonators.
Implementation Method 1
a structure surrounded by an electromagnetic wave shielding member
Implementation Method 2
N (N≥2) resonators including a cavity resonator are connected in series via an inverter on a power transmission route
Implementation Method 3
LC parallel resonators
Implementation Method 4
including capacitors and LC parallel resonators
Data Source
AI summary
A wireless power transfer system includes a cavity resonator entirely surrounded by an electromagnetic wave shielding member having appropriate conductivity and frequency selectivity; at least one power reception unit; at least one power transmission unit; and at least one resonator (e.g., a resonant network). In an equivalent circuit of the wireless power transfer system from a power transmission circuit of the power transmission unit to a power reception circuit of the power reception unit, N (N≥2) resonators including the cavity resonator are connected in series via an inverter on a power transmission route from the power transmission circuit to the power reception circuit.