Heat Spreader Design for Thermal Management of Electronic Components
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Solution Overview
Problem
Existing thermal interface materials (TIMs) used in heat-generating electronic components have poor thermal conductivity and require thick layers to compensate for manufacturing tolerances, leading to increased thermal resistance and higher component temperatures.
Innovation Solution
A design featuring a heat spreader with an area at least 4 times greater than the heat-generating component, directly in thermal contact without a dielectric layer, and a heat sink with increased mass and area, utilizing a dielectric TIM layer only at the interface with the heat sink, to enhance heat conduction and reduce thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick TIM layer is used to compensate for manufacturing tolerances, then electrical insulation is improved, but thermal conductivity deteriorates
Solution Approach 1:
The thermal management system is divided into two separate interfaces: a first non-dielectric interface between the heat-generating component and heat spreader for optimal thermal conduction, and a second dielectric interface between the heat spreader and heat sink for electrical insulation. This segmentation allows each interface to be optimized for its specific function without compromise.
Solution Approach 2:
A heat spreader is introduced as an intermediary component between the heat-generating component and heat sink. The heat spreader serves as a thermal bridge that conducts heat efficiently from the component while providing a separate interface for dielectric insulation, thus mediating between the conflicting requirements of thermal conduction and electrical insulation.
2Manufacturing precision
If the TIM layer thickness is increased, then manufacturing tolerance compensation is improved, but thermal resistance increases
Solution Approach 1:
The thermal path is segmented into two interfaces with different characteristics. The first interface (component to heat spreader) is non-dielectric with minimal thickness for optimal thermal conduction. The second interface (heat spreader to heat sink) is dielectric and handles the tolerance compensation requirement. This segmentation prevents the TIM layer thickness from being increased unnecessarily.
Solution Approach 2:
The invention changes the parameter of TIM layer thickness at different interfaces. At the first interface, the TIM layer is minimized or eliminated to maintain low thermal resistance. At the second interface, the TIM layer thickness can be increased to compensate for manufacturing tolerances. This parameter change allows optimization of both thermal conduction and tolerance compensation.
3Temperature
If a heat spreader with larger area is used, then heat distribution is improved, but device complexity increases
Solution Approach 1:
The heat spreader serves multiple functions simultaneously: it acts as a thermal bridge for heat conduction, provides a large area for heat distribution to the heat sink, and serves as a mounting platform for the heat-generating component. This multi-functionality justifies the additional component by consolidating several thermal management functions into one element.
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 configuration significantly reduces the temperature of the heat-generating component by increasing heat transfer efficiency, with a potential temperature reduction of up to 20°C, by spreading heat effectively through the larger interface area and thinner TIM layer.
Implementation Method 1
the first surface of the heat spreader is in thermal contact with the first surface of the heat-generating component along a first interface
Implementation Method 2
a layer of dielectric TIM (thermal interface material) provided at the second interface and in direct contact with the second surface of the heat spreader and the first surface of the heat sink
Implementation Method 3
a heat sink having a first surface and an opposite second surface, wherein the heat sink has a greater mass than the heat spreader and comprises one or more layers of thermally conductive metal or non-metal
Data Source
AI summary
An electronic device includes a heat-generating electronic component, a heat spreader and a heat sink. The heat spreader has an area at least about 4 times greater than the heat-generating component. A first surface of the heat spreader is in thermal contact with the first surface of the heat-generating component along a first, non-dielectric interface. The heat sink has greater mass than the heat spreader and comprises one or more layers of thermally conductive material. A first surface of the heat sink is in thermal contact with the second surface of the heat spreader along a second interface having greater area than the first interface. Dielectric thermal interface material is provided at the second interface in direct contact with the heat spreader and the heat sink, such that the second interface is dielectric.