Heat Pipe Thermal Management for LED Light Units
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Solution Overview
Problem
High heat concentration in LED light units due to large numbers of LEDs packed in small spaces leads to reduced lifetimes and potential failure, especially in applications like beacon lights where high light output is required, necessitating effective heat management to maintain optimal operating temperatures.
Innovation Solution
The use of heat pipes integrated with thermally conductive support plates and a heat collector system that employs evaporative cooling to efficiently transfer heat away from the LEDs, utilizing a working fluid with a capillary structure to enhance heat dissipation, and strategically placing heat pipes directly beneath the LED arrays to minimize thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of LEDs are packaged in a small space to achieve high light output, then illumination intensity is improved, but heat concentration increases leading to reduced reliability
Solution Approach 1:
The patent extracts heat from the LED assembly by introducing heat pipes that draw thermal energy away from the LED die and board. The heat pipes are positioned to contact the LED board and extract heat, transferring it to a heat sink structure, thereby removing the harmful thermal accumulation that would otherwise reduce LED reliability and lifetime.
Solution Approach 2:
The patent introduces heat pipes as an intermediary thermal management component between the LED board and the heat sink. The heat pipes act as a mediator that efficiently transfers heat from the concentrated LED sources through a phase-change mechanism, providing effective thermal coupling without direct thermal contact between the LED die and the heat sink structure.
2Loss of energy
If heat pipes are positioned directly beneath LED arrays to minimize thermal resistance, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the heat pipe structure with the support plate or housing structure of the LED assembly. The heat pipes are integrated into the existing structural components rather than being separate add-on elements, allowing thermal management functionality to be combined with mechanical support functions, thereby reducing overall device complexity while maintaining effective heat dissipation.
Solution Approach 2:
The heat pipe structure serves multiple functions: it provides thermal management by conducting heat away from LEDs, acts as a structural support element for mounting LEDs, and serves as a mounting surface for the LED board. This multi-functionality reduces the number of separate components needed, simplifying the overall device structure while achieving effective heat dissipation.
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 effectively extends the lifespan of LEDs by efficiently dissipating heat, reducing maintenance needs, and ensuring the LEDs operate within optimal temperature ranges, even in challenging environments like radio transmission towers and wind turbine generators.
Implementation Method 1
at least one heat pipe coupled to said LED board
Implementation Method 2
employs evaporative cooling to efficiently transfer heat away from the LEDs
Implementation Method 3
utilizing a working fluid with a capillary structure to enhance heat dissipation
Data Source
AI summary
A light emitting diode (LED) light unit is disclosed. For example, the LED light unit includes at least one support plate having one or more inner openings. At least one LED array may be coupled to an LED board. The LED light unit also includes at least one heat pipe coupled to the LED board, wherein said LED board is coupled to the at least one support plate.