Inductive Power Transmitter With Non-Uniform Coil Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inductive power transfer systems face inefficiencies due to non-uniform magnetic fields, particularly weaker towards the center, which requires precise alignment and increased power on the primary side, leading to increased losses and decreased efficiency.
Innovation Solution
A transmitter with a coil arrangement that varies in density along the height of the side walls, increasing and then decreasing, and the inclusion of magnetically permeable layers to enhance the uniformity of the magnetic field within the enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large coil covering the entire surface area is used, then more freedom in device placement is achieved, but the magnetic field becomes non-uniform and weaker towards the centre
Solution Approach 1:
The patent applies local quality by varying the coil density distribution across different regions of the transmitter. Specifically, the coil density is increased towards the center region and decreased towards the edges, creating non-uniform local characteristics that compensate for the natural field weakness at the center. This allows the magnetic field to maintain adequate strength and uniformity across the entire surface area, enabling free device placement while preserving field quality.
2Reliability
If power on the primary side is increased to ensure sufficient power transfer to the centre, then power transfer reliability is improved, but losses increase and efficiency decreases
Solution Approach 1:
The patent implements local quality by creating regions of different coil densities across the transmitter surface. The center region has higher coil density to generate stronger magnetic flux, while edge regions have lower density. This localized optimization ensures that sufficient power is delivered to devices placed at the center without requiring excessive overall power input, thereby reducing energy losses and improving efficiency.
Solution Approach 2:
The patent applies parameter changes by varying the physical density parameter of the coil arrangement across different spatial locations. By changing the coil density parameter from uniform to non-uniform distribution, the system optimizes magnetic field strength in different regions, ensuring reliable power transfer to center-placed devices while minimizing total energy consumption and losses.
3Loss of energy
If precise alignment of transmitter and receiver coils is required, then power transfer efficiency is improved, but user convenience deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality through non-uniform coil density distribution. The enhanced center region density compensates for misalignment scenarios, allowing the system to maintain good power transfer efficiency even when devices are not precisely positioned. This eliminates the need for strict alignment requirements while preserving efficiency, greatly improving user convenience.
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
The solution results in a more uniform magnetic field across the enclosure, ensuring efficient power transfer to devices regardless of their location, reducing inefficiencies and parasitic heating.
Implementation Method 1
one or more coils comprising a series of loops of wire wound about the enclosure, for generating an alternating magnetic field within the enclosure
Implementation Method 2
a layer/core made of a material of high magnetic permeability (such as ferrite) can be included in the transmitter or receiver to improve the transfer of energy over the magnetic field
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
An inductive power transfer transmitter that includes an enclosure for accommodating devices to be energised. The enclosure has one or more side walls and one or more coils for generating an alternating magnetic field within the enclosure. The density of the one or more coils varies with distance from an end of the one or more sidewalls.