Wireless Power Coil Layout for Stable Coupling at Larger Gaps
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Solution Overview
Problem
The coupling coefficient between power transmission and reception coils in wireless power transmission systems decreases with increasing separation distance, leading to reduced power reception and potential operational failures in movable objects.
Innovation Solution
The wireless power transmission apparatus includes power transmission coils with specific conductor width configurations and adjusted separation distances or overlapping sections to maintain a high coupling coefficient, even with larger heights and separation distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the separation distance between adjacent power transmission coils is increased, then the ease of installation and manufacturing is improved, but the coupling coefficient between power transmission and reception coils decreases
Solution Approach 1:
The power transmission coils are designed with non-uniform conductor widths, where specific portions have different widths to optimize the magnetic field distribution. This local variation in conductor width allows the coils to maintain high coupling coefficients even at larger separation distances, resolving the contradiction between ease of installation and coupling coefficient maintenance.
Solution Approach 2:
The invention changes the physical parameters of the power transmission coils by varying the conductor widths in different portions. By adjusting these geometric parameters, the magnetic field characteristics are optimized to maintain effective coupling over larger distances, thus allowing greater separation without compromising power transmission reliability.
2Power
If the conductor width of power transmission coils is increased, then the power transmission capability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The power transmission coils are segmented into multiple portions along the moving direction, with each portion having a specific conductor width. This segmentation allows the system to achieve high power transmission capability through optimized magnetic field distribution while keeping the overall structure manageable and not excessively complex.
Solution Approach 2:
Different portions of the coil have different conductor widths tailored to their specific functional requirements. This local optimization ensures that power transmission capability is enhanced where needed while avoiding unnecessary complexity in other regions, thus resolving the contradiction between power capability and device complexity.
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 prevents a decrease in the coupling coefficient, ensuring stable power transmission to movable objects by optimizing conductor widths and separation/overlapping arrangements.
Implementation Method 1
a power reception coil mounted on the movable object moves parallel to and in close proximity to a power transmission coil installed along a moving route of the movable object, so that the power is wirelessly fed from the power transmission coil
Data Source
AI summary
A wireless power transmission apparatus includes a first power transmission coil configured to transmit power to a power reception coil, and including a portion with a first conductor width and a portion with a second conductor width, and a second power transmission coil configured to transmit power to the power reception coil, and including a portion with a third conductor width and a portion with a fourth conductor width. The first and second power transmission coils are adjacent at the portion with the second conductor width and the portion with the fourth conductor width with a predetermined separation distance. A sum of the second conductor width and the fourth conductor width is smaller than a sum of the first conductor width and the third conductor width. The predetermined separation distance is smaller than or equal to a smaller one of the second conductor width and the fourth conductor width.