Coil Apparatus Resonance Frequency Divergence Control
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Solution Overview
Problem
Existing non-contact magnetic resonance power transmission systems face efficiency declines due to divergence in resonance frequencies and potential reductions in the Quality Factor (Q value) when coils with high Q values are brought close together, requiring frequent re-adjustment and risking performance degradation.
Innovation Solution
Incorporating a second resonance circuit magnetically coupled to the first resonance circuit, comprising a control coil and a variable capacitor, allows for adjustment of resonance frequencies without modifying the excitation or transmission coils, thereby stabilizing power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a variable capacitor is added externally to adjust resonance frequency, then resonance frequency matching is improved, but device complexity increases
Solution Approach 1:
A third coil (control coil) is introduced as an intermediary element that magnetically couples with both the power transmission coil and power receiver coil. By adjusting the resonance frequency of this control coil, the resonance frequencies of the transmission and receiver coils are indirectly controlled, achieving frequency matching without directly modifying the main power transmission components.
2Productivity
If coils with high Q values are brought close together for efficient power transmission, then power transmission efficiency is improved, but resonance frequency divergence occurs
Solution Approach 1:
The control coil forms a feedback mechanism where its resonance frequency is adjusted in response to the positional relationship between transmission and receiver coils. This feedback control compensates for frequency divergence caused by mutual coupling, maintaining stable resonance conditions even when coils are positioned close together for efficient power transfer.
3Reliability
If resonance frequency is adjusted by modifying transmission coil, then frequency matching is improved, but Q value decreases
Solution Approach 1:
The system is segmented into three independent coil components: power transmission coil, power receiver coil, and control coil. The resonance frequency adjustment function is separated from the main power transmission coils and assigned to the dedicated control coil. This segmentation allows frequency tuning without compromising the high Q values of the primary power transmission path.
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 effectively corrects resonance frequency divergence and enhances power transmission efficiency by allowing for easy adjustment without affecting the Q value, ensuring stable performance across varying positional relationships.
Implementation Method 1
a second resonance circuit together with a second capacitance element, and which is magnetically coupled to the first winding section
Implementation Method 2
Magnetic resonance type power transmission which is capable of supplying power with high efficiency over relatively moderate distances by matching the resonance frequencies
Data Source
AI summary
A coil apparatus and a non-contact power transmission apparatus having improved power transmission efficiency are provided.A power transmission side coil apparatus comprises: an excitation coil (second winding section) which transmits AC power supplied from a power source to a transmission coil; a resonance circuit (first resonance circuit) which is formed by a capacitor (first capacitance element) and a transmission coil (first winding section) which is connected to this capacitor and which transmits AC power from the excitation coil to a power receive side coil apparatus; and a resonance circuit (second resonance circuit) which is formed by a variable capacitor (second capacitance element) and a control coil (third winding section) which is connected to this variable capacitor and which resonates with the transmission coil.