Elastically Deformable Heat Sink for RF Amplifier Thermal Management
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Solution Overview
Problem
High-energy-density electronic components, such as radiofrequency power amplifiers, face challenges in heat dissipation due to electromagnetic interference and inefficiencies in existing cooling methods, which can lead to component failure and reduced circuit performance.
Innovation Solution
A localized heat extraction system using a finned heat sink, an elastically deformable and thermally conductive layer, and a frame with sliding drains that maintain contact with the amplifiers regardless of thickness variations, effectively evacuating heat without electromagnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal pad is used to evacuate heat from amplifiers, then heat dissipation is improved, but electromagnetic coupling between input and output increases and circuit efficiency decreases
Solution Approach 1:
The patent divides the heat evacuation function into multiple localized drains positioned at specific locations on the amplifiers, rather than using a single large thermal pad. This segmentation allows heat to be extracted at multiple points while minimizing the total surface area in contact with the amplifiers, thereby reducing electromagnetic coupling while maintaining effective heat dissipation.
Solution Approach 2:
The patent implements localized heat extraction through multiple small drains positioned at specific high-heat-generation areas on the amplifiers. Each drain is strategically placed to target local hot spots, providing focused thermal management where needed most while leaving other areas untouched, thus avoiding unnecessary electromagnetic interference in low-heat zones.
2Reliability
If a large thermal pad is used to compensate for positioning drifts, then heat dissipation reliability is improved, but electromagnetic coupling increases and circuit efficiency decreases
Solution Approach 1:
The patent employs elastically deformable drains that can dynamically adjust their contact pressure and position in response to amplifier positioning variations. This dynamic adaptation allows the drains to maintain reliable thermal contact despite manufacturing tolerances and assembly variations, eliminating the need for oversized thermal pads while ensuring consistent heat evacuation.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the drain elements by making them elastically deformable. This parameter change allows the drains to flex and conform to the actual position of the amplifiers, maintaining reliable thermal contact across varying conditions without requiring excessive contact area that would cause electromagnetic coupling.
3Device complexity
If heat is evacuated only through the electronic card base, then device complexity is reduced, but heat evacuation efficiency decreases due to heat recirculation
Solution Approach 1:
The patent extracts the heat evacuation function from the electronic card base and implements it directly on the amplifiers through attached drains. By taking the cooling function out of the card structure and placing it directly on the heat-generating components, the system achieves more efficient heat removal at the source before heat can recirculate through the card, improving thermal management effectiveness.
4Temperature
If a rigid heat sink is used, then heat dissipation is improved, but adaptability to thickness variations and positioning drifts decreases
Solution Approach 1:
The patent replaces rigid heat sink structures with elastically deformable drains that can dynamically adapt to variations in amplifier thickness and positioning. These flexible drains maintain consistent thermal contact despite manufacturing tolerances and assembly variations, providing reliable heat dissipation across different component specifications without requiring complex adjustment mechanisms.
Solution Approach 2:
The patent uses elastically deformable drain elements that function similarly to flexible thermal interfaces. These compliant structures can bend and conform to the actual geometry of the amplifiers, ensuring maintained thermal contact across thickness variations and positioning drifts, unlike rigid heat sinks that would lose contact under such conditions.
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 solution provides robust and efficient heat dissipation, reducing amplifier temperatures by 40°C and surrounding temperatures by 10°C, while preventing electromagnetic interference, thus enhancing the reliability and performance of electronic equipment.
Implementation Method 1
un elastomere thermiquement conducteur
Implementation Method 2
un elastomere
Implementation Method 3
heat sink ailette
Implementation Method 4
heat sink
Data Source
Figure 1~2
Figure 3a~5
Figure 6~8
AI summary
Removing device including: a heat exchanger (16) that is mounted on a platen (14) so that the exchanger lies above and a distance away from an electronic component; a chassis (17) that lies between the electronic component and the platen, and means for fastening the chassis to the platen or to the electronic board; a rigid heat sink (18) that is mounted on the chassis in order to slide perpendicularly to the electronic board (12) and that has a first end making contact with the component and a second end in abutment against a thermally conductive layer (19) that is fastened to the platen in order to elastically return the rigid heat sink (18) into abutment against the electronic component (11) whatever the thickness of the electronic component. Electronic equipment comprising such a removing device.