Modular Ferrite Shielding for EV Wireless Power Coils
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Solution Overview
Problem
Conventional ferrite-based shielding sheets for wireless power transfer modules in electric vehicles are heavy, increasing the overall weight and reducing fuel efficiency, while maintaining power transmission efficiency.
Innovation Solution
A magnetic field shielding module for electric vehicles comprising a shielding layer made of multiple unit blocks of ferrite material with recessed grooves to accommodate a planar coil, allowing for a large-area implementation with reduced weight and enhanced mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-area ferrite shielding sheet is used to shield the magnetic field in wireless power transfer modules for electric vehicles, then the power transmission efficiency is satisfied, but the overall weight of the module increases significantly
Solution Approach 1:
The large-area ferrite shielding sheet is divided into multiple smaller unit blocks that can be arranged in a modular fashion. This segmentation maintains the required shielding area and power transmission efficiency while reducing the overall weight by using only the necessary shielding coverage rather than a continuous large sheet.
Solution Approach 2:
Instead of uniformly shielding the entire large area, the invention applies ferrite unit blocks only in specific locations where magnetic field shielding is most needed. The unit blocks are strategically positioned to target the strongest magnetic field regions, providing effective shielding while minimizing the total amount of ferrite material used and thus reducing weight.
2Reliability
If a large-area shielding sheet is implemented to ensure adequate magnetic field coverage, then the shielding effectiveness is maintained, but the mass production rate decreases
Solution Approach 1:
The shielding system is segmented into standardized unit blocks that can be independently manufactured and then assembled into various configurations. This modular approach enables parallel production of multiple unit blocks, significantly increasing mass production rate while maintaining shielding effectiveness through proper arrangement of the blocks.
Solution Approach 2:
The ferrite unit blocks are designed with universal dimensions and mounting features that allow them to be used in multiple positions and configurations. This universality simplifies the manufacturing process and assembly operations, enabling faster mass production while ensuring consistent shielding performance across different applications.
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 maintains power transmission efficiency and reduces weight, enhancing mass production capabilities by using a modular design with ferrite-based unit blocks and recessed grooves.
Implementation Method 1
a shielding layer including a plurality of unit blocks made of a ferrite material to shield a magnetic field generated from a planar coil
Data Source
AI summary
Provided is a magnetic field shielding module for an electric vehicle. The magnetic field shielding module for an electric vehicle according to an embodiment of the present invention is utilized in a wireless power transmission module for an electric vehicle, and comprises: a shielding layer including a plurality of unit blocks which are made of ferrite materials so as to be able to block a magnetic field generated from a flat coil in which a conductive member is wound multiple times; and a coil accommodation groove recessed to a certain depth from one surface of the shielding layer so as to be able to accommodate the thickness of the flat coil. The shielding layer is formed in a plate shape having a certain area by arranging the plurality of unit blocks adjacent to each other.