Microfluidic Cable Cooling with Liquid Metal
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Solution Overview
Problem
Conventional heatsinks for electronic devices are bulky and costly due to their large size, and they do not efficiently dissipate heat from high-power semiconductor components, leading to inefficiencies in cooling and increased weight.
Innovation Solution
The implementation of microfluidic channels filled with liquid metal, which are actively pumped through to enhance heat transfer and distribution, allowing for more precise cooling of circuit boards and high-current applications, thereby reducing the need for oversized heatsinks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heatsinks are used to dissipate heat from electronic devices, then heat dissipation function is provided, but the device size and weight increase significantly
Solution Approach 1:
The patent applies hydraulic cooling by pumping liquid metal through microfluidic channels formed within the circuit board substrate. This replaces conventional solid heatsinks with a fluid-based thermal management system, achieving superior heat dissipation efficiency while dramatically reducing device weight and size. The liquid metal flows through channels in direct contact with heat-generating components, providing efficient heat transfer without requiring large external heatsink structures.
Solution Approach 2:
The patent transitions from three-dimensional external heatsink structures to two-dimensional microfluidic channels embedded within the circuit board substrate. This dimensional integration allows the cooling system to be built into the board itself rather than adding external components, reducing overall device footprint and weight while maintaining effective heat dissipation from high-power semiconductor devices.
2Temperature
If conventional heatsinks are used for cooling, then heat dissipation is achieved, but the cost and material usage increase
Solution Approach 1:
The patent integrates microfluidic channels directly into the circuit board substrate, transitioning from external three-dimensional heatsink structures to embedded two-dimensional channel networks. This integration eliminates the need for separate heatsink components and reduces overall material consumption while providing effective cooling through the liquid metal flowing through the substrate channels.
Solution Approach 2:
By using liquid metal flowing through microfluidic channels, the system replaces bulky solid heatsink materials with a compact fluid-based thermal management solution. This hydraulic approach achieves superior heat dissipation with significantly reduced material usage, as the liquid metal can be circulated through efficiently designed channel paths within the substrate.
3Productivity
If larger heatsinks are used to improve cooling efficiency, then heat dissipation increases, but device complexity and size increase
Solution Approach 1:
The patent embeds microfluidic channels within the circuit board substrate, transforming the cooling system from external three-dimensional structures to integrated two-dimensional channel networks. This integration simplifies the overall device architecture by combining the cooling function within the existing board structure rather than adding separate complex cooling assemblies.
Solution Approach 2:
The circuit board substrate serves multiple functions: it provides mechanical support for components, electrical connectivity through traces, and thermal management through embedded microfluidic channels. This multi-functionality eliminates the need for separate dedicated cooling components, reducing device complexity while maintaining high cooling efficiency through the liquid metal circulation system.
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 solution effectively reduces the weight and size of cooling systems by actively moving liquid metal through microfluidic channels to dissipate heat efficiently, maintaining component longevity and safety while minimizing material usage.
Implementation Method 1
Motion of liquid metal through the fluidic channel dissipates heat away from the conductor
Data Source
AI summary
Fluidic channels and pumps for active cooling of cables are described. One cable assembly includes a conductor having a length between a first end of the cable and a second end of the cable and a fluidic channel structure that at least partially surrounds the conductor along the length of the conductor. A first pump connector is coupled to a first end of the fluidic channel structure and a second pump connector is coupled to a second end of the fluidic channel structure. Motion of liquid metal, when pumped through the fluidic channel structure, distributes heat away from the conductor.