Dual-Coil Wireless Power Transmission for Uniform Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power charging systems face inefficiencies and increased costs due to varying coupling coefficients and limited chargeable regions, as the power transmission efficiency changes with the position of the wireless power reception device.
Innovation Solution
A wireless power transmission device with a dual-coil configuration, comprising an outer transmission coil and an inner transmission coil, where the inner coil has a radius less than the outer coil and is positioned between 20 mm to 30 mm away from it, ensuring a bilaterally symmetrical magnetic field and uniform coupling coefficient across positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transmission coil is used in the wireless power charging system, then the device structure is simple, but the coupling coefficient varies with position and the chargeable region is limited
Solution Approach 1:
The single transmission coil is divided into multiple independent coils (first transmission coil and second transmission coil) with different radii. Each coil segment contributes to the overall magnetic field in a specific spatial region, enabling extended chargeable region while maintaining manageable structural complexity through modular design
2Area of stationary object
If the transmission coil radius is increased to expand the chargeable region, then the coverage area increases, but the coupling coefficient becomes non-uniform across different positions
Solution Approach 1:
Different transmission coils with different radii are positioned at specific locations to create locally optimized magnetic field distributions. The first transmission coil with larger radius covers outer regions while the second transmission coil with smaller radius covers inner regions, ensuring uniform coupling coefficient across the entire chargeable region through spatially differentiated coil characteristics
3Productivity
If multiple transmission coils with different radii are used to achieve uniform coupling coefficient, then the power transmission efficiency improves, but the device structure and manufacturing complexity increase
Solution Approach 1:
The second transmission coil with smaller radius is positioned within or adjacent to the first transmission coil with larger radius, creating a nested or concentric configuration. This nesting approach maximizes space utilization, simplifies the overall device footprint, and facilitates manufacturing by reducing the number of discrete components that need to be assembled
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 stabilizes the coupling coefficient, reduces power transmission variations, decreases implementation costs, and enhances the efficiency and expandability of the wireless power charging system by maintaining a consistent chargeable region.
Implementation Method 1
The wireless power transmission device wirelessly transmits power and the wireless power reception device wirelessly receives power
Implementation Method 2
The wireless power reception device wirelessly receives power
Data Source
AI summary
A wireless power transmission device includes a mounting member, first and second terminals mounted on the mounting member and a transmission coil connected to the first and second terminals. The transmission coil includes an outer transmission coil and an inner transmission coil extending from the outer transmission coil and having a radius less than that of the outer transmission coil, and a distance between the outer transmission coil and the inner transmission coil is in a range from 20 mm to 30 mm.