LED Light Engine Thermal Management for Low-Profile Fixtures
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Solution Overview
Problem
Conventional lighting fixtures are bulky and require significant overhead space due to their depth, which is not suitable for low-profile installations, and they often lack efficient heat management systems for LED light engines.
Innovation Solution
The integration of both convective and conductive heat transfer components in LED light engines, including thermal pads and fins, allows for efficient heat dissipation in various fixture shapes and depths, providing a reliable thermal connection through a single connection system that minimizes fixture depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lighting fixtures are designed to retain incandescent or fluorescent lighting, then they can accommodate traditional bulb types, but they require significant overhead space and are bulky due to their depth
Solution Approach 1:
The patent changes the fundamental parameters of heat management by transitioning from passive convection-dependent designs to active dual-path thermal conduction systems. This enables the fixture to maintain effective heat dissipation while reducing depth from several inches to under two inches, resolving the contradiction between adaptability and compactness
Solution Approach 2:
The heat management system is segmented into distinct conductive and convective paths with separate components. The conductive path uses thermal pads and heat sinks with fixed heat transfer coefficients, while the convective path handles variable heat dissipation. This segmentation allows independent optimization of each path, enabling compact fixture design while maintaining compatibility with various bulb types
2Temperature
If conventional lighting fixtures are designed with sufficient depth for heat dissipation, then they can manage thermal loads effectively, but they become bulky and require significant overhead space
Solution Approach 1:
The patent transitions from relying solely on vertical convective heat dissipation (depth-dependent) to implementing horizontal thermal conduction paths through thermal pads and heat sinks. This dimensional shift in heat transfer strategy allows effective thermal management in shallow fixtures with depth under two inches, eliminating the need for several inches of depth while maintaining heat dissipation efficiency
Solution Approach 2:
Thermal pads serve as intermediary components between the bulb base and heat sink, providing high thermal conductivity contact in a thin profile. These intermediaries enable efficient conductive heat transfer without requiring the vertical space needed for conventional convective cooling, thus reducing fixture depth while maintaining temperature control
3Length of stationary object
If lighting fixtures are designed with reduced depth for low-profile installations, then they can be installed in false ceilings with minimal overhead space, but they lack sufficient space for effective heat management
Solution Approach 1:
The patent merges conductive and convective heat transfer mechanisms into a unified dual-path thermal management system. The conductive path (thermal pads + heat sinks) and convective path (airflow channels) work together in parallel within the reduced depth space, providing robust thermal management capability that would be impossible with either mechanism alone in such a compact configuration
Solution Approach 2:
The heat management system uses composite material structures combining thermally conductive materials (metal heat sinks, thermal pads) with thermally insulating or convectively-active materials. This composite approach enables efficient heat extraction from the bulb while maintaining the shallow profile required for low-profile installations in false ceilings
4Length of stationary object
If lighting fixtures are made compact to reduce overhead space, then they are suitable for low-profile installations, but they increase the weight density requiring direct securement to structural members
Solution Approach 1:
The patent changes the material composition parameters by using high-strength, low-density materials in the heat sink and structural components. This allows the fixture to maintain compact depth while reducing overall weight density, enabling installation on lighter ceiling materials without requiring direct securement to structural members despite the concentrated mass in a small volume
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 enables the use of LED light engines in both conventional and low-profile fixtures, ensuring effective heat management and reducing the size of lighting fixtures while maintaining efficient thermal performance.
Implementation Method 1
a transfer surface configured to provide a conductive heat path away from the LED when the light engine is installed within a light fixture such that the transfer surface is configured to abut a portion of the light fixture
Implementation Method 2
a convective heat transfer component configured to provide a convective thermal path away from the LED
Implementation Method 3
the convective heat transfer component can include a plurality of thermal fins, rods, and/or pins disposed radially outward of at least a portion of the transfer surface
Implementation Method 4
the convective heat transfer component can include a plurality of thermal fins, rods, and/or pins disposed radially outward of at least a portion of the transfer surface
Data Source
AI summary
This disclosure provides systems, methods and apparatus for low-profile lighting systems. In one aspect, an LED-based light engine, which may be thinner and/or lighter than conventional light engines, may be retained in both conventionally-dimensioned and low-profile light fixtures. In another aspect, a light engine can include both convective and conductive heat transfer components, the efficacy of which will vary based on the dimensions of a light fixture in which the light engine is installed.