Angled-Arm Stiffener Plates for Uniform Thermal Interface Pressure
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Solution Overview
Problem
Uneven pressure distribution across the thermal interface material (TIM) between an electronic component and a heat sink due to asymmetrical arrangements of components on the printed circuit board leads to variations in bond line thickness, resulting in thermal impedance and hotspot formation, which affects cooling efficiency and mechanical reliability.
Innovation Solution
A stiffener plate with angled arms is coupled to the printed circuit board to apply uniform pressure across the TIM by compensating for uneven pressure from the heat sink, using selective angling of arms to generate varying forces that adjust pressure distribution and maintain consistent bond line thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat sink is coupled to the printed circuit board to cool electronic components, then heat dissipation is improved, but uneven pressure distribution occurs across the thermal interface material due to asymmetrical component arrangements
Solution Approach 1:
The stiffener plate is designed with asymmetrical arm configurations where each arm has a different bend angle tailored to the specific asymmetrical arrangement of electronic components on the PCB. This intentional asymmetry compensates for the uneven pressure distribution caused by the heat sink, transforming the harmful asymmetrical pressure into a beneficial compensated pressure distribution that achieves uniform contact across the thermal interface material.
Solution Approach 2:
The patent modifies the geometric parameters of the stiffener plate arms by adjusting their bend angles to specific values that correspond to the locations and weights of electronic components. By changing these angular parameters, the stiffener plate generates varying forces that counterbalance the uneven pressure from the heat sink, thereby achieving uniform pressure distribution across the thermal interface material.
2Reliability
If the thermal interface material is compressed to reduce bond line thickness and thermal impedance, then heat transfer efficiency is improved, but uneven compression leads to hotspot formation and reduced reliability
Solution Approach 1:
The stiffener plate employs asymmetrical arm designs with different bend angles positioned according to the asymmetrical distribution of electronic components. This asymmetrical configuration enables the stiffener plate to apply differentiated compensating forces to various regions of the thermal interface material, ensuring uniform compression despite the uneven pressure from the heat sink, thereby preventing hotspots and improving thermal interface reliability.
Solution Approach 2:
Each arm of the stiffener plate is designed with a specific bend angle tailored to the local requirements of different regions on the PCB. This local customization of arm geometry allows the stiffener plate to apply precisely the right amount of compensating force to each area, ensuring that the thermal interface material is uniformly compressed across its entire surface, which prevents localized hotspots and enhances overall reliability.
3Stress or pressure
If a stiffener plate with bent arms is used to compensate for uneven pressure, then pressure distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The stiffener plate is segmented into multiple arms, each with a specific bend angle, rather than using a single uniform structure. This segmentation allows each arm to independently compensate for pressure unevenness in its specific region, achieving overall uniform pressure distribution. The segmented design is more complex than a simple flat plate but remains manufacturable and provides significant performance benefits.
Data Source
AI summary
Stiffener plates for electronic components are disclosed. An example stiffener plate for an electronic circuit board includes a body; and a first arm extending from the body, the first arm disposed at a first bend angle relative to the body, the first bend angle to change responsive to coupling of the first arm to the printed circuit board.