Embedded Oscillating Heat Pipe Cooling for 3D IC Hot Spots
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Solution Overview
Problem
Integrated circuits face challenges in managing heat generated due to increasing transistor density, particularly in three-dimensional structures where heat is buried within layers with poor thermal conductivity, making it difficult for traditional thermal management systems to effectively control small and inaccessible hot spots.
Innovation Solution
The integration of miniaturized oscillating heat pipes (OHPs) within the integrated circuit using silicon fabrication techniques to transfer high local heat fluxes to more accessible locations for efficient heat dissipation, utilizing meandering channels filled with a working fluid that undergoes evaporation and condensation to create pressure imbalances and facilitate heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistor density is increased to improve circuit functionality, then productivity is improved, but heat generation increases causing thermal management difficulties
Solution Approach 1:
The patent segments the heat removal function by creating separate micro-channel pathways embedded within the IC substrate that directly conduct heat from specific hot spot regions to heat sink areas, rather than relying on bulk thermal conduction through the entire substrate
Solution Approach 2:
The patent transitions from two-dimensional surface cooling to three-dimensional internal cooling by embedding micro-channels within the substrate volume, allowing heat to be removed from internally generated hot spots that are inaccessible to traditional surface-mounted heat sinks
2Temperature
If traditional heat sinks are used for cooling, then heat dissipation is achieved, but they cannot effectively access buried hot spots in three-dimensional IC structures
Solution Approach 1:
The patent nests the micro-channel cooling system within the IC substrate itself, with channels embedded inside the substrate material and interconnected to external heat sinks, creating a hierarchical structure where the cooling system is integrated at multiple scales
Solution Approach 2:
The patent introduces micro-channels as an intermediary medium that bridges the gap between internally generated heat and externally applied heat sinks, allowing thermal energy to be transported from inaccessible buried regions to accessible cooling surfaces
3Temperature
If pumped fluid systems are implemented for active cooling, then heat transfer efficiency is improved, but system complexity and pressure requirements increase
Solution Approach 1:
The patent enables the cooling system to be self-regulating through passive convection mechanisms, where natural density differences between heated and cooled fluid regions drive circulation without requiring external pumps or complex control systems
Solution Approach 2:
The patent replaces active mechanical pumping systems with passive thermal convection mechanisms, eliminating the need for motors, seals, and pressure control systems while maintaining effective heat transfer through natural buoyancy-driven fluid circulation
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 transfers heat from localized hot spots to more accessible areas within the IC, enabling efficient heat dissipation and reducing operating temperatures, thus addressing the limitations of traditional thermal management systems in managing high heat fluxes in dense IC structures.
Implementation Method 1
utilizing meandering channels filled with a working fluid that undergoes evaporation and condensation to create pressure imbalances and facilitate heat transfer
Implementation Method 2
utilizing meandering channels filled with a working fluid that undergoes evaporation and condensation to create pressure imbalances and facilitate heat transfer
Implementation Method 3
Other known cooling techniques have attempted to use passive fluid cooling of integrated circuit (IC) devices using pulsating or oscillating heat pipes modularly built and added to the IC devices
Data Source
AI summary
A miniaturized oscillating heat pipe (OHP) embedded within an integrated circuit (IC) is provided. The miniaturized oscillating heat pipe (OHP) integrally formed within an integrated circuit (IC) is fabricated to form a monolithic IC device using silicon (or similar future semiconductors) fabrication techniques. The OHP is operable to transfer high local heat fluxes within the IC device to more accessible locations on the IC device for heat rejection to an available heat sink.