Nested Channel Arrays for Localized Thermal Conductivity
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Solution Overview
Problem
Current methods to reduce thermal resistance between an integrated circuit chip and a heat sink require complex modifications or expensive water cooling solutions, failing to effectively manage hot-spot temperatures without altering the microprocessor fabrication process.
Innovation Solution
Creating regions of higher thermal conductivity in the interface between the chip and heat sink by using nested channel arrays in the heat sink opposite hot spots on the chip, with a thermally conductive composition containing a higher concentration of conductive particles that flow into these channels during bondline formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If complex modifications to package lids, caps, or heat sink are made (such as mechanical cap standoffs or patterned surfaces), then thermal resistance is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating non-uniform particle concentration in the thermal interface material, with higher concentrations of thermally conductive particles specifically positioned at locations corresponding to chip hot spots. This localized enhancement of thermal conductivity directly addresses the temperature problem without requiring complex structural modifications throughout the entire package assembly.
2Loss of energy
If direct water cooling with pumps, fluidic interconnects, and heat exchangers is implemented, then heat dissipation is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential cooling function from complex water cooling systems by using a simplified thermal interface material that provides enhanced heat transfer through optimized particle distribution. This eliminates the need for pumps, fluidic interconnects, and heat exchangers while maintaining effective heat dissipation from chip hot spots.
3Temperature
If thermal paste or adhesive with thermally conductive particles is used, then thermal resistance is reduced, but manufacturing precision is compromised due to tolerance variations
Solution Approach 1:
The patent applies preliminary action by pre-positioning thermally conductive particles in specific concentration gradients within the thermal interface material before application. This pre-arranged particle distribution compensates for subsequent manufacturing variations and tolerance accumulations, ensuring consistent thermal performance despite variations in assembly processes.
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 effectively reduces chip hot-spot temperatures by optimizing particle packing and thermal conductivity at specific locations, minimizing thermal resistance without requiring changes to the microprocessor fabrication process or adding complex components.
Implementation Method 1
creating regions of higher thermal conductivity in the interface between the chip and heat sink or heat spreader during bondline formation
Implementation Method 2
a thermally conductive composition containing thermally conductive particles located between the heat sink and integrated circuit chip and containing higher concentration of conductive particles in the nested channel arrays
Data Source
AI summary
Integrated circuit-chip hot spot temperatures are reduced by providing localized regions of higher thermal conductivity in the conductive material interface at pre-designed locations by controlling how particles in the thermal paste stack- or pile-up during the pressing or squeezing of excess material from the interface. Nested channels are used to efficiently decrease the thermal resistance in the interface, by both allowing for the thermally conductive material with a higher particle volumetric fill to be used and by creating localized regions of densely packed particles between two surfaces.