Asymmetric Annular Resonator Geometry for Reduced Current Crowding
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Solution Overview
Problem
Annular resonators in wireless power transmission devices experience current crowding and increased resistance due to non-uniform magnetic field alignment, leading to efficiency degradation.
Innovation Solution
The curvature of the inner and outer surfaces of the annular resonator is aligned with the magnetic field curvature, ensuring a uniform electric current flow and reducing resistance, thereby enhancing transmission efficiency and increasing the Q-factor and transmission distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner and outer surfaces of the annular resonator are formed in a symmetric structure, then the manufacturing is simplified, but current crowding increases and resistance increases, degrading resonator efficiency
Solution Approach 1:
The patent applies asymmetry by making the inner surface curvature radius different from the outer surface curvature radius of the annular resonator. Specifically, the inner surface has a smaller curvature radius than the outer surface, creating an asymmetric structure that aligns with the magnetic field distribution. This asymmetric design reduces current crowding and resistance, thereby improving resonator efficiency while maintaining manufacturing feasibility.
2Ease of manufacture
If the inner and outer surfaces of the annular resonator are formed in a symmetric structure, then the manufacturing is simplified, but resistance increases due to non-uniform current flow
Solution Approach 1:
The patent applies asymmetry by making the inner surface curvature radius different from the outer surface curvature radius of the annular resonator. Specifically, the inner surface has a smaller curvature radius than the outer surface, creating an asymmetric structure that aligns with the magnetic field distribution. This asymmetric design reduces current crowding and resistance, thereby improving resonator efficiency while maintaining manufacturing feasibility.
3Device complexity
If the curvature of the inner and outer surfaces is not aligned with the magnetic field curvature, then the resonator structure is simpler, but wireless power transmission efficiency degrades
Solution Approach 1:
The patent applies local quality by optimizing the curvature radius at different locations of the resonator. The inner surface is designed with a smaller curvature radius than the outer surface, creating location-specific geometric properties that match the local magnetic field distribution. This local optimization improves wireless power transmission efficiency by reducing current crowding and aligning the resonator structure with the magnetic field curvature, while maintaining overall structural simplicity.
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 alignment improves wireless power transmission efficiency, reduces current crowding, and increases the Q-factor and transmission distance in wireless power transmission devices.
Implementation Method 1
A PTU or wireless power transmission device may include a resonator or coil capable of generating an inductive magnetic field if an electric current flows according to the resonance type or induction type
Implementation Method 2
the battery of the PRU may be charged by a method such as electromagnetic induction or electromagnetic resonance between the transmitting coil or resonator of the PTU and the receiving coil or resonator of the PRU
Data Source
AI summary
Disclosed is an annular resonator including a conductor formed on a surface of an annular shaped structure and having a first end and a second end opposite to the first end, and a capacitor having a first end and a second end opposite to the first end, wherein a radius of curvature of a first side facing a center portion of the annular shaped structure is smaller than a radius of curvature of a second side facing an outer periphery of the annular shaped structure, and wherein the first end and the second end of the conductor are electrically connected to the first end and the second end of the capacitor, respectively.