Multi-column graphite-over-foam assembly for EMI shielding and thermal conduction
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Solution Overview
Problem
Conventional thermal interface materials (TIMs) fail to provide effective electromagnetic interference (EMI) or electromagnetic compatibility (EMC) shielding, leading to design complexity and high costs due to their limited thermal management capabilities, particularly in computing components like CPUs and ICs, where they do not adequately dissipate heat or absorb EMI.
Innovation Solution
A multi-column graphite-over-foam (GOF) assembly is introduced, comprising foam columns individually wrapped in graphite sheets, with an additional graphite layer and an electrically conductive outer layer. This configuration reduces heat conduction resistance by distributing heat over a larger surface area and absorbs EMI, allowing for efficient thermal management and EMC shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional thermal interface materials are used, then thermal management is provided, but EMI/EMC shielding is not provided, leading to design complexity and high cost
Solution Approach 1:
The patent combines multiple functions (thermal management, EMI shielding, and EMC grounding) into a single multi-column graphite-over-foam assembly. The graphite layers provide both thermal conduction and EMI shielding, while the conductive outer layer provides EMI absorption and grounding, eliminating the need for separate heatsinks, EMI shields, and TIMs
Solution Approach 2:
The multi-column GOF assembly serves multiple purposes simultaneously: the graphite sheets conduct heat away from heat sources, the graphite layers provide EMI shielding, and the electrically conductive outer layer absorbs EMI and provides grounding. This multi-functional component replaces several traditional separate components
2Temperature
If conventional thermal interface materials are used, then thermal conduction is provided, but heat dissipation effectiveness is limited, requiring additional components
Solution Approach 1:
The assembly is divided into multiple foam columns, each individually wrapped in graphite sheets. This segmentation creates multiple parallel thermal conduction paths from the heat source to the heatsink, increasing the overall heat dissipation capacity compared to a single monolithic structure
Solution Approach 2:
The patent transitions from conventional 2D thermal interface materials to a 3D multi-column structure with graphite layers wrapped around foam columns. This dimensional change increases the surface area for thermal conduction and creates multiple thermal pathways, significantly improving heat dissipation effectiveness
3Object-affected harmful factors
If EMI shielding is added to thermal management, then EMC performance is improved, but design complexity and cost increase
Solution Approach 1:
The patent merges EMI shielding and thermal management functions into the same multi-column GOF assembly. The graphite layers serve dual purposes: conducting heat away from heat sources and shielding against EMI, while the conductive outer layer provides both EMI absorption and thermal conduction pathways
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 multi-column GOF assembly significantly reduces heat conduction resistance and effectively shields EMI, improving thermal efficiency and EMC performance while potentially replacing multiple components like heatsinks and EMC shields, thus offering a cost-effective solution.
Implementation Method 1
the graphite layer is configured to thermally couple the electrically conductive outer layer to the plurality of foam columns
Implementation Method 2
the electrically conductive outer layer is configured to absorb electromagnetic interference (EMI)
Data Source
AI summary
A multi-column graphite-over-foam (GOF) assembly includes a plurality of foam columns wherein each foam column of the plurality of foam columns are individually wrapped in a graphite sheet. A graphite layer surrounds the plurality of foam columns and an electrically conductive outer layer surrounding the graphite layer. The graphite layer is configured to thermally couple the electrically conductive outer layer to the plurality of foam columns, and the electrically conductive outer layer is configured to absorb electromagnetic interference (EMI).