Thermally Conductive Polymer Heat Sink for LED Encapsulation
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Solution Overview
Problem
Current thermal management materials for electronic devices, such as LED lamps, require additional components like potting compounds and separate housings, which increase production complexity and costs, and do not adequately address thermal conductivity and mechanical interlocking needs.
Innovation Solution
A thermally conductive amorphous thermoplastic polymer heat sink combined with reaction injection molded (RIM) polyurethane forms a single assembly that encapsulates electronic components, eliminating the need for potting compounds and separate housings, and provides enhanced thermal management and mechanical interlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional thermal management materials are used with separate housings and potting compounds, then thermal management function is provided, but device complexity and production cost increase
Solution Approach 1:
The patent combines the housing, thermal management function, and potting compound into a single integrated polymer component. The thermally conductive polymer composition serves multiple functions simultaneously: structural housing, thermal pathway for LED heat dissipation, and encapsulation for electronic components, eliminating the need for separate parts and reducing production complexity
Solution Approach 2:
The polymer composition is designed to perform multiple functions within a single material system. It provides structural support as a housing, thermal conduction for heat management, electrical insulation, and mechanical encapsulation for potting, making one component serve universal roles that traditionally required multiple separate components
2Reliability
If traditional separate housing and potting compound assembly is used, then encapsulation is provided, but manufacturing steps increase
Solution Approach 1:
The patent incorporates the potting compound function directly into the housing material itself, so the encapsulation of electronic components is achieved during the primary molding process rather than requiring a separate subsequent potting step. This preliminary integration of functions reduces the total number of manufacturing steps
Solution Approach 2:
The housing and potting compound are merged into a single integrated component made from the same thermally conductive polymer composition. This eliminates the need for separate assembly steps where a potting compound would be applied after housing assembly, streamlining the manufacturing process
3Temperature
If thermally conductive materials are added to polymer matrix, then thermal conductivity is improved, but material homogeneity may be compromised
Solution Approach 1:
The patent uses a composite polymer composition consisting of a base polymer matrix (such as polycarbonate or polybutylene terephthalate) combined with thermally conductive fillers (such as aluminum oxide, aluminum nitride, or boron nitride). This composite structure achieves high thermal conductivity while maintaining material homogeneity through proper dispersion of fillers in the polymer matrix
Solution Approach 2:
The patent optimizes the concentration, size, and distribution parameters of the thermally conductive filler particles within the polymer matrix. By controlling these parameters, the material achieves enhanced thermal conductivity while maintaining sufficient homogeneity and structural integrity for manufacturing
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 simplifies production, improves thermal management, and integrates mechanical interlocking, extending the service life of electronic devices by maintaining operating temperatures within critical limits.
Implementation Method 1
a heat sink comprising a thermally conductive thermoplastic polymer composition
Implementation Method 2
the polyurethane is reaction injection molded partially or fully surrounds the heat sink and one or more additional electronic components
Data Source
AI summary
The present invention provides an assembly comprising a thermally conductive thermoplastic polymer as a heat sink to provide thermal management for an electrical/electronic component and a reaction injection molded (RIM) polyurethane to replace the potting compound typically used in such assemblies. In addition to replacing the potting compound, the cured polyurethane forms the part, such as the base of the LED bulb, which heretofore has been a separate component, thus reducing the number of components and saving a production step.