Space-Adaptive Wireless Power Transfer Using Evanescent Field Resonance
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Solution Overview
Problem
Existing wireless power transfer systems using magnetic induction face limitations in power transfer efficiency and distance due to directional constraints, particularly when coils are not aligned, and struggle with spatial adaptability, making it difficult to apply in various real-world scenarios.
Innovation Solution
A space-adaptive magnetic resonance wireless power transfer system that uses magnetically-coupled resonance with coils arranged at a right angle or specific inclination, allowing for efficient power transfer regardless of directionality, by employing resonant coils with the same frequency and incorporating an intermediate coil for enhanced energy transmission, and utilizing impedance matching and capacitive tuning to maintain high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If magnetic induction method is used for wireless power transfer, then power can be transmitted wirelessly, but power transfer distance is limited to a few centimeters and efficiency is very low when coil arrangements are not identical
Solution Approach 1:
The patent applies resonance phenomenon to the electromagnetic field by tuning the resonant frequencies of Tx and Rx coils to match, creating oscillating magnetic fields that enhance coupling. This resonance-based approach transforms the static magnetic induction into a dynamic oscillating field system, enabling efficient energy transfer over extended distances without significant efficiency loss
Solution Approach 2:
The patent changes the operating parameters by using resonant frequencies matched between Tx and Rx coils, and by allowing flexible coil arrangements (parallel, perpendicular, or inclined) rather than requiring identical orientations. This parameter flexibility resolves the contradiction by maintaining efficiency across various spatial configurations
2Length of stationary object
If LC resonance is used with variable capacitor to increase power receiving distance, then transmission distance and efficiency are improved, but it is difficult to precisely adjust the variable capacitor to match resonant frequency
Solution Approach 1:
The patent introduces a coupling coefficient as an intermediary parameter that quantifies the magnetic coupling between Tx and Rx coils. By using this intermediary measure, the system can optimize power transfer by adjusting coil orientations and positions to achieve desired coupling levels, providing a practical approach to frequency and spatial matching
Solution Approach 2:
The patent employs dynamic adjustment capabilities where the resonant frequencies of both Tx and Rx coils can be tuned independently to achieve matching conditions. This dynamic tuning approach allows the system to adapt to varying distances and orientations, maintaining precise frequency alignment without relying solely on fixed capacitor adjustments
3Loss of energy
If resonant coils are arranged in parallel configuration, then coupling constant is maximized, but spatial adaptability is limited and practical application in various scenarios is difficult
Solution Approach 1:
The patent creates a universal power transfer system that functions effectively across multiple spatial configurations. By designing the resonant coupling mechanism to be orientation-independent, the same basic system architecture can operate in parallel, perpendicular, or inclined arrangements, making it universally applicable to diverse practical scenarios without requiring configuration-specific design modifications
Solution Approach 2:
The patent embraces asymmetric coil arrangements (perpendicular or inclined configurations) as equally effective as symmetric parallel arrangements. This asymmetric approach breaks the conventional requirement for identical coil orientations, allowing the system to adapt to asymmetric spatial constraints in real-world applications while maintaining efficient power transfer
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 approach overcomes the limitations of traditional parallel coil arrangements, enabling greater effective power transmission distance and improved efficiency, even in non-parallel configurations, and allows for flexible placement of resonant coils, enhancing practical applicability.
Implementation Method 1
magnetically-coupled resonance of the evanescent field which is generated around a wireless power transmitting coil
Implementation Method 2
magnetically-coupled resonance of the evanescent field which is generated around a wireless power transmitting coil
Implementation Method 3
the resonant coil of a power receiving unit and the resonant coil of a power transmitting unit are configured to have the same resonant frequency so that magnetic field is coupled between the transmitting (Tx) resonant coil and the receiving (Rx) resonant coil
Implementation Method 4
a method is used of performing LC resonance using a variable capacitor in a solenoid-type coil
Implementation Method 5
the resonant frequencies of the Tx and Rx power resonant coils are tuned using the variable capacitor
Implementation Method 6
an induction coil is wound on a magnetic body to increase magnetic flux
Data Source
AI summary
A magnetic resonance wireless power transfer method according to an aspect of the present invention includes transmitting power from a source coil to the Tx resonant coil using a magnetic induction method, transmitting the power from the Tx resonant coil to an Rx resonant coil, having a resonant frequency identical with that of the Tx resonant coil, via magnetically-coupled resonance, and transmitting the power from the Rx resonant coil to the device coil of an electronic device using the magnetic induction method. The Tx resonant coil and the Rx resonant coil are arranged at a right angle or a specific angle of inclination relative to each other.