Shielded Magnetic Device Conductive Layer EMI Reduction
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Solution Overview
Problem
Conventional magnetic devices face significant electromagnetic interference (EMI) issues due to magnetic field leakage, particularly with folded metal casings that are costly, large, and prone to gaps, which exacerbate the problem as electronic circuits become more miniaturized and operate at higher frequencies.
Innovation Solution
A magnetic device with a shielding layer made of high conductivity metals like Cu and high permeability metals like Fe and Ni, applied through electroplating, sputtering, or as a conductive adhesive material, to cover the body and prevent magnetic field leakage, ensuring continuous coverage without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a folded metal casing is used to shield a magnetic device, then the shielding effectiveness is improved, but the device size and cost increase
Solution Approach 1:
The patent applies a thin conductive shielding layer (metal film or conductive coating) directly on the magnetic device body instead of using a thick folded metal casing. This thin film approach provides effective EMI shielding while maintaining a compact device size, eliminating the need for bulky folded plate structures.
Solution Approach 2:
The shielding layer is integrated directly onto the magnetic device body, nesting the shielding function within the device structure itself rather than adding an external casing. This integration reduces overall device volume while maintaining shielding effectiveness.
2Object-affected harmful factors
If a folded metal casing is used to shield a magnetic device, then the shielding structure is provided, but gaps appear at corners causing magnetic field leakage
Solution Approach 1:
The flexible thin film shielding layer can conform to the device contours and corners without creating gaps, providing continuous coverage that prevents magnetic field leakage at corners and edges where folded plates would have gaps.
Solution Approach 2:
Instead of using a rigid external casing that must be assembled with joints and seams, the patent inverts the approach by applying a conformal coating or deposited film directly on the device surface, ensuring continuous coverage without gaps.
3Object-affected harmful factors
If a folded metal casing is used to shield a magnetic device, then shielding is provided, but the manufacturing cost increases
Solution Approach 1:
The thin film shielding layer can be applied through cost-effective processes such as electroplating, sputtering, or conductive adhesive coating, eliminating the need for expensive precision fabrication and assembly of folded metal casings.
Solution Approach 2:
The patent replaces the mechanical folded plate structure with a deposited or coated shielding layer, substituting complex mechanical assembly with simpler deposition or coating processes that reduce manufacturing cost.
4Productivity
If electronic circuits are miniaturized and operated at higher frequencies, then the system integration is improved, but the EMI problem becomes more serious
Solution Approach 1:
The thin film shielding layer provides effective EMI protection for miniaturized high-frequency circuits without adding significant size, enabling continued circuit miniaturization and high-frequency operation while controlling EMI.
Solution Approach 2:
The patent uses composite shielding structures combining different materials (such as copper layer for conductivity and magnetic material layer for permeability) to provide effective EMI shielding across different frequency ranges, addressing the EMI challenges of miniaturized high-frequency systems.
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 effectively reduces EMI across both high and low operating frequencies by creating a seamless shielding layer, minimizing magnetic field leakage and addressing the size and cost concerns of conventional solutions.
Implementation Method 1
the shielding layer made of metal with a high conductivity, such as Cu, is good for shielding high-frequency magnetic field
Implementation Method 2
the shielding layer made of metal with a high conductivity, such as Cu, is good for shielding high-frequency magnetic field
Implementation Method 3
the shielding layer made of metal with a high permeability, such as Fe and Ni, is good for shielding low-frequency magnetic field
Implementation Method 4
the at least conductive layer is made of metal that is electroplated on the body for shielding the magnetic device
Implementation Method 5
the at least conductive layer is made of metal that is sputtered on the body for shielding the magnetic device
Data Source
AI summary
At least one shielding layer made of conductive material is formed on a body of a magnetic device to prevent magnetic fields from leaking to the outside of the magnetic device so as to reduce EMI and the size of the magnetic device.