Troffer LED Fixture Heat Dissipation and Color Mixing
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Solution Overview
Problem
Troffer-style lighting fixtures face challenges in heat management and color uniformity when using high power LEDs, with traditional designs often requiring dedicated heat sinks and experiencing optical losses due to diffusive elements for color mixing.
Innovation Solution
The design incorporates a light engine with a shell and internal reflector, where emitters are mounted directly on the shell or internal reflector, eliminating the need for a dedicated heat sink and using a unique junction box configuration, and a lens is secured between the light engine and reflector rims without visible connectors, enhancing heat dissipation and color mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional troffer designs use dedicated heat sinks for high power LEDs, then heat management is improved, but device complexity and weight increase
Solution Approach 1:
The patent combines the heat sink function with the existing fixture housing structure. The housing is designed to directly contact and conduct heat away from the LED modules, eliminating the need for separate dedicated heat sinks. This merging of functions reduces component count and simplifies the overall fixture design while maintaining effective thermal management.
Solution Approach 2:
The fixture housing serves multiple functions simultaneously: it provides structural support, enables heat dissipation through thermal conduction, and houses the LED modules. By making the housing multi-functional, the patent eliminates the need for additional dedicated heat sink components, thereby reducing device complexity.
2Stability of the object's composition
If diffusive elements are used for color mixing in LED troffers, then color uniformity is improved, but optical losses increase
Solution Approach 1:
The patent introduces a reflective surface as an intermediary between the LED sources and the output. This reflective surface redirects light from multiple LED positions to create uniform color distribution without requiring diffusive materials. The reflection process maintains optical efficiency while achieving color mixing, thus avoiding the optical losses associated with diffusers.
3Temperature
If emitters are mounted directly on shell or internal reflector, then heat dissipation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the emitter mounting into modular LED modules that can be independently manufactured and then assembled onto the fixture. This segmentation allows for standardized mounting interfaces and simplifies the overall manufacturing process, reducing the precision requirements compared to directly mounting individual emitters on the shell or reflector.
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 reduces the weight and cost of the fixture, improves luminous uniformity, and achieves high lumen output per kilogram while minimizing optical losses, allowing for efficient heat dissipation and effective color mixing.
Implementation Method 1
LEDs are solid state devices that convert electric energy to light and generally comprise one or more active regions of semiconductor material interposed between oppositely doped semiconductor layers. When a bias is applied across the doped layers, holes and electrons are injected into the active region where they recombine to generate light.
Implementation Method 2
The surrounding phosphor material 'downconverts' some of the blue light, changing it to yellow light.
Implementation Method 3
a reflector with a first portion and a second rim
Implementation Method 4
A lens can be between the rims
Implementation Method 5
elements of the troffer on the back side dissipate heat generated by the light source into the plenum where air can be circulated to facilitate the cooling mechanism
Data Source
AI summary
The present invention relates to different embodiments of lighting fixtures, such as troffers. A lens can be placed between a light engine and a reflector and secured in place by crimping portions of the light engine, reflector, or both to prevent the lens from moving. Troffers according to the present invention can lack a dedicated heat sink, instead sufficiently dissipating heat through the light engine. This can significantly reduce the weight of the troffer. Emitter panels can be directly mounted on a light engine inner surface, or on an internal reflector within the light engine.