Heat Sink Lifting Elements for Optical Module TIM Protection
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Solution Overview
Problem
The challenge of preventing damage to the thermal interface material (TIM) during the online insertion and removal (OIR) of QSFP-DD optical transceiver modules, which is exacerbated by the high power density and increasing cooling demands in compact form factors, leading to potential performance issues and equipment malfunction.
Innovation Solution
The implementation of lifting elements, such as wedge or ball elements, on the heat sink that create a gap between the TIM and the optical module during insertion or removal, which snap into recesses on the module when fully inserted to ensure direct contact and prevent damage, allowing for passive operation without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal interface material (TIM) is introduced between the heat sink and optical module to improve cooling efficiency, then heat transfer performance is improved, but the TIM is at risk of damage during module online insertion and removal (OIR)
Solution Approach 1:
The lifting elements (wedges or balls) are designed to be movable rather than fixed, allowing them to dynamically adjust their position between protruding (during insertion/removal to prevent TIM contact) and retracted (during normal operation for thermal contact) states. This dynamic behavior resolves the contradiction by enabling the system to switch between protection mode and thermal contact mode.
Solution Approach 2:
The lifting elements are positioned in advance on the heat sink before module insertion begins. During the insertion process, they proactively create the gap and prevent TIM contact before damage can occur. The spring mechanism ensures they are ready to act immediately upon module insertion, performing the protective action beforehand rather than reactively.
2Reliability
If lifting elements are added to prevent TIM damage during OIR, then TIM protection is improved, but device complexity increases
Solution Approach 1:
Rather than making the entire heat sink complex, the lifting elements are applied locally at specific contact points where the module interacts with the heat sink during insertion. Only the necessary lifting features (wedges or balls with springs) are added at these critical locations, while the rest of the heat sink structure remains simple and unchanged.
Solution Approach 2:
The spring-loaded lifting elements are self-actuating and require no external control mechanism. The spring force automatically pushes the lifting elements into the protruding position during insertion, and the module's own weight and positioning automatically cause the elements to retract when properly seated. This self-service mechanism eliminates the need for motors, sensors, or control circuits.
3Ease of manufacture
If wedge elements are used as lifting elements, then ease of manufacture is improved, but friction during insertion increases
Solution Approach 1:
Ball elements are used instead of wedge elements. The spherical shape of the balls allows them to roll rather than slide during insertion, dramatically reducing friction. The balls are spring-loaded to maintain contact and provide the lifting action, but their curved surface enables rolling motion that requires minimal force compared to the sliding friction of wedges.
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 prevents TIM damage during OIR, enhancing thermal management and module reliability while maintaining cost-effectiveness and compatibility with standard designs, ensuring efficient heat transfer and maintaining equipment functionality.
Implementation Method 1
a plurality of lifting elements extending from the surface of the heat sink. The lifting elements are configured to create a gap between the thermal interface material and the optical module during insertion of the optical module into the optical module cage or removal of the optical module from the optical module cage
Implementation Method 2
a thermal interface material attached to a surface of the heat sink for thermal contact with the optical module
Data Source
AI summary
In one embodiment, an apparatus includes a heat sink for attachment to an optical module cage configured for receiving an optical module, a thermal interface material attached to a surface of the heat sink for thermal contact with the optical module, and a plurality of lifting elements extending from the surface of the heat sink. The lifting elements are configured to create a gap between the thermal interface material and the optical module during insertion of the optical module into the optical module cage or removal of the optical module from the optical module cage, the plurality of lifting elements positioned for insertion into aligned recesses in the optical module when the optical module is fully inserted into the optical module cage to eliminate the gap and provide contact between the optical module and the thermal interface material.