Ferrite Hollow Structure for Compact Wireless Power Reception
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Solution Overview
Problem
Existing wireless charging systems face challenges in minimizing the physical size of power reception and transmission devices due to the incorporation of filters, which generate noise and require additional space.
Innovation Solution
Incorporating a filter coil within a ferrite structure that includes a hollow portion on the back surface, allowing the filter coil to be contained within the device without increasing its size, and using an inductor core to reduce magnetic flux resistance and the number of turns, thereby suppressing magnetic coupling and allowing for compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is incorporated into the power reception device to suppress noise emission, then noise suppression is improved, but the physical size of the device increases
Solution Approach 1:
The filter coil is nested within the hollow portion formed in the back surface of the ferrite, allowing the filter to be incorporated into the existing ferrite structure without increasing the overall device volume. The filter coil is positioned inside the hollow space, effectively utilizing the existing structural volume.
Solution Approach 2:
The ferrite serves multiple functions: it provides magnetic coupling for the power reception coil and simultaneously houses the filter coil within its hollow portion. This multi-functionality allows the same ferrite component to support both power reception and noise filtering operations.
2Object-affected harmful factors
If a filter coil is added to the power reception device, then noise suppression is improved, but the device complexity increases
Solution Approach 1:
The filter coil is merged with the ferrite structure by positioning it within the hollow portion formed in the ferrite's back surface. This integration combines the filter function with the existing ferrite component, reducing the number of separate parts and simplifying the overall device structure.
Solution Approach 2:
The filter coil is nested within the hollow portion of the ferrite, allowing the filter to be incorporated into the existing ferrite structure without increasing the overall device volume. The filter coil is positioned inside the hollow space, effectively utilizing the existing structural volume.
3Volume of moving object
If the filter coil is positioned close to the power reception coil, then space is saved, but magnetic coupling between the coils increases
Solution Approach 1:
The hollow portion in the ferrite's back surface provides a localized space for the filter coil that is spatially separated from the power reception coil on the facing surface. This local structural modification allows the filter coil to be positioned close to the power reception coil in terms of overall device size while maintaining magnetic isolation through the ferrite structure.
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 effectively suppresses size increases in both power reception and transmission devices while maintaining efficient noise suppression and magnetic coupling reduction, enabling the integration of additional devices within the same space.
Implementation Method 1
a ferrite on which the power reception coil and the filter coil are disposed
Implementation Method 2
receiving electric power from an externally provided power transmission device in a wireless manner
Implementation Method 3
In order to suppress the emission of the noise to the outside through the coil of the coil unit, a filter is disposed between the coil and the frequency converter
Data Source
AI summary
In a power reception device, a ferrite includes an annular coil mount on which a power reception coil is disposed at the facing surface side, and a projection projecting in a power reception direction from a portion of the coil mount located on an inner side of the power reception coil, a back surface of the ferrite is provided with a hollow portion formed of the projection and the coil mount, the power reception coil is provided at the outer peripheral surface side of the projection, and a filter coil is provided along an inner peripheral surface of the hollow portion.