Light Engine Assembly Thermal Interface for LED Heat Dissipation
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Solution Overview
Problem
Conventional lighting systems, particularly those using incandescent bulbs, are inefficient and have short lifespans, requiring frequent replacements and posing challenges in thermal management for solid-state light emitters like LEDs, which are critical for maintaining performance and longevity in recessed lighting applications.
Innovation Solution
The design of a light engine assembly that includes a trim element, a light engine housing with a thermal interface or fins for effective heat dissipation, ensuring the external surface of the light engine housing is in contact with the internal surface of the trim element to manage heat effectively, thereby maintaining optimal operating conditions for solid-state light emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solid state light emitters like LEDs are used to replace incandescent bulbs, then energy efficiency and lifespan are improved, but thermal management becomes more critical and complex
Solution Approach 1:
The patent introduces a thermal interface element as an intermediary component between the LED and the housing. This thermal interface material facilitates efficient heat transfer from the LED junction to the housing, enabling effective thermal management without complicating the overall device structure. The intermediary element bridges the thermal gap between the light emitter and the heat dissipation pathway.
Solution Approach 2:
The patent extracts the thermal management function from the housing structure itself and implements it through a separate, dedicated thermal interface element. By taking out the thermal interface function as a distinct component, the design achieves specialized heat dissipation while keeping the housing structure simple and focused on its primary lighting function.
2Illumination intensity
If LEDs are operated at high temperatures to maintain brightness, then illumination intensity is improved, but device lifespan and performance deteriorate
Solution Approach 1:
The patent converts the harmful effect of heat generation by LEDs into a beneficial thermal management opportunity. By implementing effective thermal interface elements and heat dissipation pathways, the design allows the LED to operate at optimal temperatures for high brightness while simultaneously preventing overheating that would reduce lifespan. The heat that would normally be harmful is channeled through controlled pathways for dissipation.
3Adaptability or versatility
If conventional lighting fixtures are installed in difficult-to-access locations, then installation flexibility is improved, but maintenance and replacement become more difficult
Solution Approach 1:
The patent segments the lighting assembly into modular components including the LED engine, housing, and trim elements. This segmentation allows for easier maintenance and replacement by enabling access to individual components without requiring disassembly of the entire fixture. The modular design maintains installation flexibility in difficult locations while simplifying future maintenance operations.
4Loss of energy
If heat is not dissipated from LED junctions, then energy efficiency is improved, but lamp life and performance are compromised
Solution Approach 1:
The thermal interface element serves as an intermediary that enables efficient heat transfer from the LED junction to the housing. This intermediary component allows the LED to operate at temperatures that maintain energy efficiency while simultaneously providing a pathway for heat dissipation that protects lifespan. The thermal interface material mediates between the conflicting requirements of heat retention for efficiency and heat dissipation for longevity.
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 enhances the thermal management of LEDs, extending their lifespan and performance by ensuring heat dissipation, reducing the need for frequent replacements and improving energy efficiency in lighting systems.
Implementation Method 1
at least one thermal interface element, the thermal interface element being positioned between and in contact with each of an external surface of the light engine housing and an internal surface of the trim element
Implementation Method 2
a plurality of light engine housing fins; each of the light engine housing fins being: in contact with an external surface of the light engine housing, in contact with an internal surface of the trim element
Data Source
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AI summary
A light engine assembly (10), comprising at least one trim element (11), a light engine housing (12), and a light engine (13) comprising at least one solid state light emitter (16). In some embodiments, an external surface of the light engine housing (12) is in contact with an internal surface of the trim element (11), in some embodiments, the light engine assembly (10) further comprises at least one thermal interface element (34)positioned between and in contact with the light engine housing (12)and the trim element (11). In some embodiments, the light engine assembly (10) further comprises light engine housing fins (34) which are in contact with the light engine housing (12) and the trim element (11).