Composite Conduction Rails for Circuit Card Thermal Management
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Solution Overview
Problem
Conventional conduction cooling techniques fail to effectively manage heat in high-power, densely packed circuit card applications, leading to overheating issues within card cages.
Innovation Solution
The implementation of a composite structure comprising an inner core with enhanced thermal conductivity and a lightweight outer structural layer to form conduction rails and other enclosure components, which provides a high thermal conductivity path while maintaining structural integrity, allowing for efficient heat dissipation from circuit cards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional conduction cooling techniques are used with solid aluminum components, then structural integrity is maintained, but thermal conductivity is insufficient for high-power applications
Solution Approach 1:
The patent applies composite materials by combining a thermally conductive core material (such as graphite or copper) with a structural material (such as aluminum or aluminum alloy) to form a composite conduction component. The core material provides enhanced thermal conductivity for efficient heat removal, while the structural material provides mechanical strength and structural integrity. This composite structure resolves the contradiction by achieving both high thermal conductivity and adequate structural strength without requiring completely new component designs.
2Temperature
If conventional aluminum conduction components are used, then ease of manufacture is maintained, but thermal conductivity is insufficient to remove heat from densely packed circuit cards
Solution Approach 1:
The composite conduction components are manufactured by first forming the core material into the desired shape, then bonding or encapsulating it with the structural material. This process, while more complex than machining solid aluminum, is still relatively straightforward and can be automated. The manufacturing complexity is justified by the significant improvement in heat removal efficiency, as the high thermal conductivity core material enables effective cooling of densely packed high-power circuit cards that conventional aluminum cannot handle.
3Productivity
If card cages are densely packed with high-power circuit cards, then productivity is improved, but heat accumulation occurs that cannot be sufficiently removed
Solution Approach 1:
The composite conduction components enable higher card density by providing sufficient heat removal capacity for multiple high-power circuit cards packed closely together. The high thermal conductivity core material efficiently conducts heat away from each card's hot spots, preventing heat accumulation even in densely packed configurations. This allows the system to maintain both high productivity through increased card density and acceptable temperature levels.
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 solution effectively maintains a suitable operating temperature in densely packed circuit card enclosures by efficiently transferring heat generated by high-power components to an external environment, outperforming conventional systems in thermal management.
Implementation Method 1
heat can be transferred away from the circuit card by conduction paths between the circuit card and the card cage chassis
Implementation Method 2
a composite structure comprising the inner core and outer structural layer can be used to form integrated cardguide conduction rails, a base, or other components of an enclosure system. These components offer high thermal conductivity and low thermal resistance.
Data Source
AI summary
A circuit card enclosure comprises a backplane including a plurality of connectors. First and second conduction rails are thermally coupled to a heat exchanger, the first and second conduction rails each comprising an inner body at least partially encapsulated by an outer body. The inner body comprises a thermally conductive material. The outer body comprises a structural material. Card slots of the circuit card enclosure are defined between opposed card channels of the first and second conduction rails. Each card slot is constructed and arranged to register an inserted circuit card with at least one of the connectors, the card channels including a thermally conductive region constructed and arranged to thermally interface with a thermal frame of an inserted circuit card, the thermally conductive region of the card channels being thermally coupled to the inner body of the conduction rail.