Switchable Coil Resonance Circuit for Non-Contact Power Transmission
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Solution Overview
Problem
Existing non-contact power transmission systems using magnetic resonance face challenges in maintaining efficient power transmission due to deviations in resonance frequency caused by changes in coil distance and metal influences, leading to reduced transmission efficiency and potential interference with other devices.
Innovation Solution
The electric power transmitting device employs a resonance circuit with a switchable coil that connects or disconnects to adjust the resonance frequency, allowing for precise control of the resonance frequency to match the transmission frequency, thereby improving transmission efficiency and reducing circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a variable impedance circuit is used to match resonance frequency, then transmission efficiency is improved, but circuit scale increases and transmission efficiency degrades due to additional losses
Solution Approach 1:
The patent extracts the impedance matching function from a separate variable impedance circuit and integrates it directly into the resonance coil structure. By making the resonance coil itself variable (through switchable turns or adjustable geometry), the matching circuit is eliminated as a separate component, thus reducing circuit scale while maintaining transmission efficiency.
Solution Approach 2:
The patent merges the resonance coil and impedance matching circuit into a single integrated structure. The resonance coil is designed with adjustable parameters (such as switchable turns or variable geometry) that allow it to perform both resonance generation and impedance matching functions simultaneously, eliminating the need for separate matching components.
2Reliability
If resonance frequency is adjusted to match transmission frequency, then transmission efficiency is improved, but the narrow bandwidth causes frequency deviation due to parasitic capacitance changes and metal influences
Solution Approach 1:
The patent implements dynamic adjustment of the resonance coil parameters (such as switching between different numbers of turns or adjusting coil geometry) to adapt to changing operating conditions. This dynamic capability allows the system to maintain optimal resonance frequency despite variations in parasitic capacitance, coil distance, or metal influences, thereby improving both transmission efficiency and frequency stability.
Solution Approach 2:
The patent changes physical parameters of the resonance coil (such as inductance through turn switching or geometry adjustment) to compensate for frequency deviations. By dynamically adjusting these parameters in response to detected frequency shifts, the system maintains stable operation across varying conditions without requiring a wide fixed bandwidth.
3Adaptability or versatility
If the distance between transmission coil and reception coil changes, then transmission flexibility is improved, but resonance frequency deviates due to parasitic capacitance changes
Solution Approach 1:
The patent implements a feedback mechanism that detects changes in resonance frequency caused by varying coil distances and automatically adjusts the resonance coil parameters (such as switching turns or modifying geometry) to compensate for the deviation. This closed-loop control maintains stable resonance frequency across different transmission distances, enabling flexible operation without sacrificing frequency stability.
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 enhances transmission efficiency by stabilizing the resonance frequency, minimizing circuit complexity, and reducing interference, while allowing for flexible adjustment to accommodate changes in the receiving device's position.
Implementation Method 1
a resonance circuit including a resonance capacity (107) and a resonance coil (106) acting as a transmitting antenna... transmits electric power in a non-contact manner with the use of resonant coupling of the resonance circuit
Implementation Method 2
a first coil (108) arranged magnetically coupled with the resonance coil (106)... controls the first coil to connect or disconnect both ends thereof so as to bring a resonance frequency of the resonance circuit close to a frequency of an electric power transmission signal
Data Source
AI summary
A non-contact power supply system is provided employing an electric power transmitting device which can improve the transmission efficiency of electric power, suppressing the circuit scale. The electric power transmitting device is configured with a resonance circuit including a resonance capacity and a resonance coil acting as a transmitting antenna, and a first coil arranged magnetically coupled with the resonance coil. The electric power transmitting device transmits electric power in a non-contact manner using resonant coupling of the resonance circuit. When transmitting the electric power, the electric power transmitting device controls the first coil to connect or disconnect both ends thereof so as to bring a resonance frequency of the resonance circuit close to a frequency of an electric power transmission signal outputted as the electric power to be transmitted.