Wireless Power Transmission Resonance Circuit Impedance Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless power transmission systems face inefficiencies when the distance between power transmission and reception electrodes is large or when no high-permittivity dielectric material is present, leading to impedance matching issues and reduced power transmission efficiency.
Innovation Solution
The system incorporates a combination of series and parallel resonance circuits in both the power transmission and reception apparatus, with series resonance circuits on the power supply side and parallel resonance circuits near the electrodes, allowing for effective impedance matching even at higher impedances and without the need for a high-permittivity dielectric material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between power transmission electrodes and power reception electrodes is increased, then the versatility and applicability of the wireless power transmission system is improved, but the power transmission efficiency deteriorates due to impedance mismatching
Solution Approach 1:
The patent changes the electrical parameters of the system by introducing resonance circuits that can operate at different frequencies. By adjusting the resonance frequency and impedance characteristics of the series and parallel resonance circuits, the system can maintain efficient power transmission across varying distances between electrodes, resolving the contradiction between distance adaptability and transmission efficiency.
Solution Approach 2:
The patent employs dynamically adjustable resonance circuits that can adapt their impedance characteristics based on the operating conditions and distance between electrodes. This dynamic adjustment allows the system to maintain optimal power transmission efficiency regardless of the electrode separation distance, enabling both versatility and efficiency.
2Loss of energy
If a dielectric material with high relative permittivity is provided between power transmission electrodes and power reception electrodes, then the power transmission efficiency is improved, but the device complexity and requirement for special materials increases
Solution Approach 1:
The patent replaces the need for dielectric materials with an electrical solution using resonance circuits. Instead of relying on physical dielectric materials with high relative permittivity to enhance capacitance and improve transmission efficiency, the system uses series and parallel resonance circuits to achieve impedance matching and maintain efficiency without additional material requirements, thereby reducing device complexity.
Solution Approach 2:
The resonance circuits act as intermediary elements between the power transmission and reception electrodes. These circuits provide the necessary impedance transformation and matching functions that would otherwise require dielectric materials, serving as an electrical mediator that simplifies the overall system configuration while maintaining high transmission efficiency.
3Loss of energy
If series resonance circuits are disposed on the power supply side and parallel resonance circuits near the electrodes, then the impedance matching capability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the resonance circuits into distinct series and parallel configurations, with series resonance circuits positioned on the power supply side and parallel resonance circuits positioned near the electrodes. This segmentation allows each circuit type to perform its specific impedance matching function optimally, improving overall power transmission efficiency while organizing the complexity into manageable, functionally distinct modules.
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 configuration enhances power transmission efficiency by achieving impedance matching and maintaining high efficiency even with large electrode distances and air gaps, surpassing conventional methods.
Implementation Method 1
a transmission-side series resonance circuit including a first coil and a first capacitor disposed between the first coil and the power transmission circuit, and a transmission-side parallel resonance circuit including a second coil and a second capacitor
Implementation Method 2
a second coil inductively coupled to the first coil
Implementation Method 3
two power reception electrodes disposed opposing the two power transmission electrodes so as to be capacitively coupled with the two power transmission electrodes to contactlessly receive the transmitted AC power
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In an embodiment, a wireless power transmission system includes at least one of the following combinations: i) a transmission-side series resonance circuit including the first coil and a first capacitor disposed between the first coil and a power transmission circuit, and ii) a transmission-side parallel resonance circuit including the second coil and a second capacitor disposed between the second coil and the two power transmission electrodes, and a combination of i) a reception-side parallel resonance circuit including a third coil and a third capacitor disposed between the third coil and two power reception electrodes, and ii) a reception-side series resonance circuit including a fourth coil and a fourth capacitor disposed between the fourth coil and a power reception circuit.