Wireless Feeding System Resonator Segmentation for Bandwidth
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Solution Overview
Problem
Magnetic field resonance type wireless feeding systems face limitations in transmission distance due to the trade-off between high Q-value for sharp resonance and narrow bandwidth, leading to decreased energy transfer efficiency and complexity when frequency shifts occur, especially with changes in environment or temperature.
Innovation Solution
Incorporating a frequency characteristic correcting circuit that expands the frequency characteristic while maintaining a high Q-value, allowing for a wider band and improved transmission efficiency by using an LC resonant circuit and matching circuit to adjust impedance and coupling strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the Q-value of the resonator is increased to achieve longer transmission distance, then the transmission distance is extended, but the bandwidth becomes narrower and frequency shift susceptibility increases
Solution Approach 1:
The resonator is divided into multiple resonant elements (first resonant element and second resonant element) with different resonance frequencies. This segmentation allows the system to operate across a wider frequency bandwidth while maintaining high Q-values for each individual element, thus extending transmission distance without sacrificing bandwidth adaptability.
Solution Approach 2:
The patent employs a composite resonator structure combining multiple resonant elements with different characteristics. This composite approach enables the system to achieve both long transmission distance (through high Q-value elements) and wide bandwidth (through diverse resonance frequencies), resolving the contradiction between these two parameters.
2Loss of energy
If the Q-value is increased to maintain sharp resonance, then transmission efficiency at resonance frequency is improved, but the system becomes highly sensitive to frequency shifts due to environmental changes
Solution Approach 1:
By segmenting the resonator into multiple elements with different resonance frequencies, the system maintains high transmission efficiency at each resonant frequency while providing redundancy against frequency shifts. If one resonant element's frequency shifts due to environmental changes, others can compensate, improving overall reliability.
Solution Approach 2:
The patent changes the resonance frequency parameter across different resonant elements rather than maintaining a single fixed frequency. This parameter diversification allows the system to adapt to environmental frequency shifts while maintaining high efficiency through the element whose resonance frequency matches the operating conditions.
3Device complexity
If a single resonant frequency is used to simplify the system, then the design becomes simpler, but the system cannot transmit power at frequencies other than the set resonance point
Solution Approach 1:
The resonator is segmented into multiple resonant elements, each capable of operating at different frequencies. This segmentation provides frequency versatility without requiring complex frequency tuning mechanisms, as each element naturally resonates at its designated frequency.
Solution Approach 2:
The composite resonator structure serves multiple frequency functions simultaneously. Each resonant element can handle different frequency requirements, making the system universally applicable across a broader frequency range while maintaining relatively simple individual element designs.
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 solution enables longer transmission distances with stable resonance frequency, reduced susceptibility to frequency shifts, and enhanced data transmission rates, while maintaining high efficiency and simplicity in system design.
Implementation Method 1
a magnetic flux needs to be shared between a feeding source and a feeding destination (power receiving side), the feeding source and the feeding destination need to be disposed in very close proximity to each other to transmit power efficiently
Implementation Method 2
a wireless feeding and charging system using a system referred to as a magnetic field resonance system utilizing an electromagnetic resonance phenomenon has recently been drawing attention
Implementation Method 3
a magnetic field resonance type wireless feeding system transmits power with a high degree of efficiency by picking up a magnetic flux generated from a transmitting coil (resonant coil) forming a resonator by a coupling coil on a receiving side
Data Source
AI summary
The present disclosure provides a wireless feeding system including: a feeding device; and a power receiving device receiving power transmitted from the feeding device; wherein the feeding device includes a power generating section generating the power to be fed, and a resonant element fed with the power generated by the power generating section, the power receiving device includes a power receiving element receiving the power transmitted from the feeding device, and supplies power according to the received power to a load, and at least one of a power propagation path to the resonant element in the feeding device and a received power propagation path in the power receiving device has a frequency characteristic correcting circuit achieving a wider band by expanding a frequency characteristic while maintaining a Q-value as high sharpness of resonance of the power.