Inverted Circuit Board Cooling with Chassis-Attached Heat Sink
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Solution Overview
Problem
Aggressive packaging and functional performance in electronic systems lead to increased risk of damage to electronic boards and connections due to the inverted mounting of semiconductor chips, which is exacerbated by the use of larger mass heat sinks that can torque or bend the boards during assembly and movement.
Innovation Solution
The implementation of a chassis-attached suspended heat sink (CASH) design where heat sinks are initially mounted to the chassis, allowing the electronic board to be securely fastened without the heat sinks attached to the semiconductor chips, preventing torque and movement that could damage the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat sinks are attached to semiconductor chips in inverted mounting configuration, then thermal efficiency is improved, but the electronic board is subjected to torque and bending that can cause damage
Solution Approach 1:
The system is divided into separate functional modules: the heat sink is detached from the semiconductor chip and instead attached to the chassis, while the semiconductor chip remains mounted on the electronic board. This segmentation eliminates the direct mechanical connection between the heavy heat sink and the board, preventing torque and bending while maintaining thermal management functionality through chassis-mounted heat dissipation structures.
Solution Approach 2:
The chassis serves as an intermediary structure that supports the heat sink independently of the electronic board. By introducing the chassis as a mediating support element, the system achieves thermal efficiency without transmitting mechanical loads to the board, thus resolving the contradiction between thermal performance and board integrity.
2Temperature
If larger mass heat sinks are used to improve cooling performance, then thermal management is enhanced, but the risk of damaging the electronic board during assembly and movement increases
Solution Approach 1:
The heavy heat sink mass is separated from the electronic board assembly and repositioned as a chassis-mounted component. This segmentation allows the use of larger, more effective heat sinks for improved cooling performance while the chassis structure bears the mechanical loads during assembly and movement, preventing damage to the electronic board and maintaining assembly reliability.
Solution Approach 2:
The heat sink is pre-mounted to the chassis structure before the electronic board assembly is installed. This preliminary action establishes a stable, load-bearing support structure that prevents damage during subsequent assembly operations and movement, allowing the use of larger heat sinks without compromising assembly reliability.
3Productivity
If inverted mounting of semiconductor chips is implemented to increase functional density, then system packaging efficiency is improved, but the stability of connections and board structure deteriorates
Solution Approach 1:
The system architecture is segmented into independent support structures: the electronic board maintains its inverted mounting configuration for packaging efficiency, while the heat sink is separated and mounted to the chassis. This segmentation stabilizes the connection structure by eliminating the torque path from the heat sink to the board, ensuring connection stability despite the inverted configuration.
Solution Approach 2:
The chassis acts as an intermediary support that stabilizes the inverted mounting configuration. By providing a rigid external support structure for the heat sink, the chassis compensates for the inherent instability of inverted mounting, maintaining connection stability while preserving the packaging efficiency benefits of the inverted configuration.
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 effectively prevents damage to the electronic board and connections by immobilizing the heat sinks relative to the chassis, ensuring stable assembly and operation while maintaining thermal efficiency through secure attachment and flexible mounting options.
Implementation Method 1
maintaining thermal efficiency through secure attachment
Implementation Method 2
heat sinks are initially mounted to the chassis... ensuring stable assembly and operation while maintaining thermal efficiency
Data Source
AI summary
An apparatus is described. The apparatus includes an electronic system. The electronic system includes a chassis. The electronic system includes a semiconductor chip cooling component that is rigidly fixed to the chassis. The electronic system includes a packaged semiconductor chip having a lid that is contact with the semiconductor chip cooling component. The electronic system includes an electronic circuit board. The packaged semiconductor chip is electro-mechanically attached to the electronic circuit board.