Relay Resonance Coil for Misaligned Wireless Power Transfer
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Solution Overview
Problem
The existing wireless power supply systems using magnetic field resonance mode face inefficiencies due to misalignment of coils, resulting in weak magnetic field coupling and reduced power transmission, especially when the coil axes are not coaxial.
Innovation Solution
Incorporating one or more relay resonance coils with the same resonance frequency as the power sending and receiving coils, positioned to optimize the crossing angles of magnetic lines between them, enhancing energy transfer efficiency by aligning the magnetic field action closer to perpendicularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the coil axis of the power sending side coil and the coil axis of the power receiving side coil are misaligned (crossed, parallel, or twisted positional relationship), then the distance between apparatuses can be relatively large, but the magnetic field coupling state becomes weak and power transmission efficiency deteriorates
Solution Approach 1:
The patent introduces a relay resonance coil as an intermediary component between the power sending resonance coil and the power receiving resonance coil. This relay coil mediates the magnetic field coupling when the sending and receiving coils are misaligned, enabling efficient power transmission over larger distances by establishing a multi-hop magnetic coupling path that compensates for the weak direct coupling between misaligned coils.
2Loss of energy
If relay resonance coils are added to enable power transmission with misaligned coils, then power transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The relay resonance coil serves as a mediating element that bridges the gap between misaligned sending and receiving coils. By positioning the relay coil at an optimal location where it can effectively couple with both the sending and receiving coils, the system achieves improved energy transfer efficiency without requiring complex alignment mechanisms or active control systems.
Solution Approach 2:
The patent employs resonance frequency synchronization as a dynamic mechanism to maintain effective magnetic coupling between the relay resonance coil and the sending/receiving coils. By keeping all coils at the same resonance frequency, the system dynamically adapts to positional variations and maintains efficient power transmission despite the added complexity of multiple coils.
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 allows for efficient power transmission even with misaligned coils, generating a strong magnetic field resonance mode and improving energy transfer efficiency by relaying power through the relay resonance coil, overcoming the limitations of direct coil alignment.
Implementation Method 1
a resonator having a resonance angle frequency ω1 is provided in the power sending apparatus, and a resonator having a resonance angle frequency ω2 is provided in the power receiving apparatus. By synchronizing these resonance angle frequencies ω1 and ω2 and adjusting the size and alignment of the resonators appropriately, a magnetic field coupling state where energy transfer by the magnetic field resonance mode can be performed is generated between the power sending apparatus and the power receiving apparatus
Implementation Method 2
a resonance circuit in which a coil and condenser are connected is utilized. By synchronizing these resonance angle frequencies ω1 and ω2 and adjusting the size and alignment of the resonators appropriately, a magnetic field coupling state where energy transfer by the magnetic field resonance mode can be performed
Implementation Method 3
The relay resonance coil has the same resonance frequency characteristic as the power sending resonance coil and the power receiving resonance coil, and relay power from the power sending resonance coil to the power receiving resonance coil wirelessly with the magnetic field resonance mode generated by synchronization of the resonance frequency with them
Data Source
AI summary
A wireless power supply system has a power sending resonance coil, a power receiving resonance coil, and a relay resonance coil. The power sending resonance coil has a predetermined resonance frequency characteristic, and transmits power wirelessly. The power receiving resonance coil has the same resonance frequency characteristic as the power sending resonance coil, and receives power wirelessly with a magnetic field resonance mode generated by synchronization of the resonance frequency. The relay resonance coil has the same resonance frequency characteristic as the power sending resonance coil and the power receiving resonance coil, and relay power from the power sending resonance coil to the power receiving resonance coil wirelessly with the magnetic field resonance mode generated by synchronization of the resonance frequency with them.