Variable Thermal Interface for Localized IC Hot-Spot Cooling
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Solution Overview
Problem
Conventional thermal management techniques for integrated circuits often result in unnecessary over-cooling, as they cool the entire circuit rather than targeting localized hot spots.
Innovation Solution
A thermal management system that uses a thermal interface material with thermally conductive particles suspended in a fluid, and applies an electric field to align these particles, creating a high thermal conductivity path specifically between hot spots and a heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermal management techniques cool the entire integrated circuit product, then the overall temperature is reduced, but unnecessary over-cooling occurs in non-hot-spot areas
Solution Approach 1:
The patent applies local quality by making different regions of the thermal interface material have different thermal conductivities. Specifically, the thermal interface material includes a first region with higher thermal conductivity targeted at hot-spot areas and a second region with lower thermal conductivity for non-hot-spot areas. This allows efficient heat removal from hot spots while minimizing energy waste from cooling unnecessary regions.
Solution Approach 2:
The thermal interface material is segmented into multiple regions with different thermal properties. The material is divided into a first region corresponding to hot-spot locations with enhanced thermal conductivity and a second region for non-hot-spot areas with standard thermal conductivity. This segmentation enables differentiated thermal management across the integrated circuit substrate.
2Temperature
If the thermal interface material uses uniformly distributed thermally conductive particles, then manufacturing is simple, but thermal resistance in hot-spot areas is not sufficiently reduced
Solution Approach 1:
The thermal interface material implements local quality by concentrating thermally conductive particles in the first region that corresponds to hot-spot locations on the integrated circuit substrate. This non-uniform particle distribution creates higher thermal conductivity specifically where needed, rather than uniform distribution throughout the entire material.
Solution Approach 2:
The thermal interface material is a composite material consisting of a matrix material and suspended thermally conductive particles. The composite structure allows tailored thermal properties by controlling particle concentration and distribution, enabling high thermal conductivity in specific regions while maintaining manageable complexity in manufacturing.
3Loss of energy
If localized cooling of hot spots is implemented, then energy waste from over-cooling is reduced, but thermal management system complexity increases
Solution Approach 1:
The thermal management system achieves localized cooling by incorporating a thermal interface material with spatially varying thermal conductivity. The material has a first region with higher thermal conductivity aligned with hot-spot locations and a second region with lower thermal conductivity, enabling energy-efficient targeted cooling without requiring complex active control systems.
Solution Approach 2:
The thermal interface material utilizes parameter changes by varying the concentration and distribution of thermally conductive particles to create regions of different thermal conductivity. This passive parameter variation achieves localized thermal management functionality without adding complex active control mechanisms.
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 approach reduces thermal resistance in localized areas, effectively cooling hot spots without over-cooling the rest of the integrated circuit, thereby improving thermal management efficiency.
Implementation Method 1
The control circuit is configured to apply an electric field to the thermal interface material using a first electrode of the first set of electrodes and a second electrode of the second set of electrodes to excite at least some of the thermally conductive particles between the first electrode and the second electrode
Implementation Method 2
a thermal interface material including thermally conductive particles suspended in a fluid. The thermal interface material is disposed between the backside of the integrated circuit and the surface of the heat exchanger
Data Source
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AI summary
A thermal management system includes an integrated circuit having an active side including a control circuit and a backside including a first set of electrodes distributed across the backside. The thermal management system includes a heat exchanger having a surface including a second set of electrodes. The thermal management system includes a thermal interface material including thermally conductive particles suspended in a fluid. The thermal interface material is disposed between the backside of the integrated circuit and the surface of the heat exchanger. The control circuit is configured to apply an electric field to the thermal interface material using a first electrode of the first set of electrodes and a second electrode of the second set of electrodes to excite at least some of the thermally conductive particles between the first electrode and the second electrode.