Thermally Conductive Plastic Cooling Fins for LED Heat Management
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Solution Overview
Problem
Conventional lighting armatures with metal housings and internal forced air cooling face challenges such as increased complexity, weight, and safety risks due to the risk of short circuitry and dielectric breakdown, especially in compact multi-LED systems used for domestic lighting, where effective heat management and safety are critical.
Innovation Solution
A lighting armature with a housing featuring cooling fins made from a plastic composition with an orientationally averaged thermal conductivity of 2.0-15 W/m.K, incorporating glass fibers and/or boron nitride, which enhances heat dissipation without the need for internal forced air cooling, thereby improving safety and reducing weight while increasing the threshold values for short circuitry and dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a metal housing with cooling fins is used, then heat dissipation is improved, but weight increases and safety risks increase due to short circuitry and dielectric breakdown
Solution Approach 1:
The patent uses a composite material consisting of a thermally conductive polymer matrix combined with aluminum oxide particles. This composite provides both thermal conductivity for heat dissipation and electrical insulation for safety, eliminating the need for metal housings while maintaining cooling effectiveness and preventing short circuitry risks
Solution Approach 2:
The patent changes the material parameter from metallic to polymer-based with controlled thermal conductivity (0.5-5 W/mK). This parameter change allows the housing to maintain heat dissipation capabilities while simultaneously providing electrical insulation properties that prevent dielectric breakdown and short circuitry
2Temperature
If internal forced air cooling with a fan is implemented, then heat management is improved, but device complexity increases
Solution Approach 1:
The patent implements passive heat dissipation where the thermally conductive polymer housing itself serves as the cooling mechanism. The material naturally conducts heat away from LED components without requiring external active cooling systems like fans, thereby simplifying the device construction while maintaining effective heat management
Solution Approach 2:
The patent removes the fan component entirely from the lighting armature design. By extracting the active cooling mechanism and replacing it with passive thermal conduction through the polymer housing, the device complexity is reduced while heat management functionality is preserved
3Illumination intensity
If compacted multi-LED systems are used, then lighting performance is improved, but heat buildup increases affecting performance and lifetime
Solution Approach 1:
The patent applies local thermal management by incorporating the thermally conductive polymer material directly in contact with heat-generating LED components. This localized approach ensures efficient heat extraction from critical areas while maintaining compact design, preventing temperature-related performance degradation and extending component lifetime
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
The use of thermally conductive plastic cooling fins effectively reduces heat buildup, eliminates the need for internal fans, and enhances safety by allowing the lighting armature to be handled without touching the electrically conductive metal shield, while maintaining high thermal conductivity and mechanical stability.
Implementation Method 1
the housing has cooling fins and wherein the cooling fins and the housing are made of a plastic composition having an orientation averaged thermal conductivity in the range 2.0 - 15 W/m.K
Implementation Method 2
the housing has cooling fins
Data Source
AI summary
The invention relates to a lighting armature or light generator, comprising a housing, a light source and drive electronics for driving the light source, wherein the having cooling fins made of a plastic composition having an orientation averaged thermal conductivity of at least 2.0 W/m.K.