Wireless Power Antenna Core with Variable Cross-Section
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Solution Overview
Problem
Conventional wireless power transfer modules with solenoid-type antenna cores have limited space utilization and lower transmission efficiency due to uniform thickness and coil protrusion, which restricts the distance between receiving and transmitting coils and affects magnetic field generation.
Innovation Solution
A wireless power transfer antenna core with a conductive member wound multiple times along a longitudinal direction, featuring a first portion with a smaller cross-sectional area and a second portion with a larger cross-sectional area, allowing for increased magnetic field induction and reduced overall thickness, enhancing space utilization and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an antenna core is formed with uniform thickness over its entire length, then the structure is simple to manufacture, but the overall thickness becomes thick due to coil protrusion and space utilization is limited
Solution Approach 1:
The antenna core is designed with different cross-sectional areas at different locations along its longitudinal direction. Specifically, the core has a first cross-sectional area at the first end and a second cross-sectional area at the second end, where the areas are different from each other. This local variation in geometry allows the coil to be wound more efficiently without uniform protrusion, reducing the overall thickness while maintaining manufacturability.
2Ease of manufacture
If the antenna core thickness is increased to accommodate coil winding, then the coil can be properly formed, but transmission efficiency decreases compared to magnetic induction method
Solution Approach 1:
The invention changes the geometric parameters of the antenna core, specifically varying the cross-sectional area along the longitudinal direction. This parameter change optimizes the magnetic field distribution and coupling between coils, improving transmission efficiency while still accommodating proper coil winding. The non-uniform cross-section creates better magnetic flux concentration compared to uniform thickness designs.
3Loss of energy
If the distance between receiving antenna core and transfer antenna core is reduced, then transmission efficiency improves, but the overall size constraint becomes more challenging
Solution Approach 1:
By creating local variations in the antenna core geometry with different cross-sectional areas at different ends, the magnetic field is concentrated more effectively in the regions where coupling occurs. This allows for reduced distance between transmitting and receiving cores while maintaining compact overall dimensions, as the enhanced local field strength compensates for the reduced separation distance.
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 configuration increases the coupling coefficient between wireless power receiving and transmitting antennas, improving transmission efficiency and allowing for closer coil spacing, resulting in a more efficient and aesthetically pleasing wireless power transfer system.
Implementation Method 1
a magnetic resonance method in which a magnetic field is generated so as to allow resonance to occur between a transmitting coil and a receiving coil
Implementation Method 2
a magnetic resonance method in which a magnetic field is generated so as to allow resonance to occur between a transmitting coil and a receiving coil in a predetermined frequency band
Data Source
AI summary
Provided is a wireless power transfer antenna core. In the wireless power transfer antenna core according to an exemplary embodiment of the present invention, a conductive member configured to serve as an antenna for transmitting or receiving wireless power is wound multiple times along a longitudinal direction. The wireless power transfer antenna core is made of a magnetic body and comprises: a first portion having a first cross-sectional area; and a second portion extending with a predetermined length from an end of the first portion and second cross-sectional area that is relatively larger than the first cross-sectional area, wherein the conductive member is wound multiple times on the first portion.