Shielded Connector Cage with Central Air Plenum for Heat Dissipation
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Solution Overview
Problem
High-speed data transmission in shielded pluggable connectors leads to increased heat dissipation challenges due to poor airflow, particularly in stacked configurations where the lower connector is sandwiched between an insulating circuit board and a heat-generating module, making cooling difficult and complicating module orientation and interface with the circuit board.
Innovation Solution
A cage design with a hollow enclosure divided into upper and lower bays and a central portion, featuring apertures for air intake and exit, allowing for convective heat transfer and airflow through the central plenum, which can be ganged for increased airflow rates and efficient cooling without altering module orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a continuous cage is used to provide EMI shielding, then electromagnetic interference protection is improved, but airflow over the module deteriorates
Solution Approach 1:
The cage is segmented into multiple sections with discrete walls instead of being continuous. The front wall, rear wall, and side walls are separated by spacers, creating gaps that allow airflow while maintaining EMI shielding through the distributed structure. This segmentation resolves the contradiction by enabling both shielding and cooling functions simultaneously.
Solution Approach 2:
Air is introduced as an intermediary cooling medium that flows through the cage structure. The spacers and wall gaps act as channels for this intermediary substance, allowing heat to be carried away from the module without compromising the EMI shielding provided by the cage walls.
2Temperature
If connectors are mounted belly to belly with heat sinks on opposite sides, then heat dissipation is improved, but module insertion complexity increases
Solution Approach 1:
The cage design uses asymmetric wall configurations where the front and rear walls have different structures. The front wall provides a flat interface for module insertion while the rear wall is optimized for heat dissipation. This asymmetry allows modules to be inserted in a single orientation without requiring belly-to-belly mounting, resolving the contradiction between heat dissipation and ease of operation.
Solution Approach 2:
The cooling function is moved from the vertical dimension (heat sinks on top and bottom) to the horizontal dimension (airflow channels through the cage walls). This dimensional shift allows heat dissipation to occur through the side walls without affecting module orientation or insertion complexity.
3Volume of moving object
If the lower connector is sandwiched between circuit board and module, then space utilization is improved, but cooling capability deteriorates
Solution Approach 1:
The cage walls are designed with different local qualities - the front and rear walls have apertures for airflow while the side walls provide structural support and additional cooling paths. The spacers between walls create localized channels that direct airflow specifically to the lower connector, enabling cooling in the sandwiched configuration without compromising space utilization.
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 design enhances cooling efficiency by facilitating air flow through the connector assembly, effectively managing heat loads up to three watts while maintaining a stacked configuration and preserving module orientation, ensuring reliable operation in high-data-rate applications.
Implementation Method 1
The side walls include apertures aligned with the center portion so that air can be drawn out of the center portion. In this manner, when the cage is positioned in an enclosure that has a negative internal pressure, air will flow through the apertures in the front face and out the apertures in the side wall so as to provide cooling.
Implementation Method 2
when the cage is positioned in an enclosure that has a negative internal pressure, air will flow through the apertures
Data Source
AI summary
A connector includes a cage that has two side walls, a top cover and a rear wall that are combined to form a hollow enclosure. The enclosure is separated into two module-receiving bays by at least one spacer with a top and bottom wall that extends between the sidewalls to form a central portion between a top and bottom bay, the central portion acting as an air passage between a front face and the sides of the connectors. Air openings are formed in the sidewalls of the cage assembly and they communicate with the central portion. The bottom wall of the spacer is provided with a large opening that extends a substantial distance of module-receiving bay and provides an air flow path from the air openings to the bottom module-receiving bay. An insert with apertures in communication with the central portion can be positioned.