Variable Height Heatsink Fins for LED Thermal Management
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Solution Overview
Problem
LED units in post-top luminaires face challenges in efficiently dissipating heat generated by LEDs, which can lead to reduced performance and lifespan due to inadequate thermal management.
Innovation Solution
The design incorporates a heatsink with variable height heat fins made from aluminum or aluminum alloys, which are thermally connected to the LED printed circuit boards and feature arcuate shapes to enhance heat dissipation through natural and forced convection, reducing heat reabsorption and optimizing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used in post-top luminaires, then energy efficiency and lifespan are improved, but heat generation increases causing reduced performance and lifespan
Solution Approach 1:
The heatsink divides the heat dissipation surface into multiple segments through heat fins of varying heights. This segmentation increases the total surface area for heat exchange and creates multiple convection pathways, allowing more efficient heat removal from the LED components without requiring a single large flat surface.
Solution Approach 2:
The patent transitions from traditional flat or uniformly finned heatsink surfaces to a three-dimensional structure with variable height fins arranged in specific patterns. This dimensional complexity creates channels and zones that enhance natural convection currents and improve heat transfer efficiency in multiple directions simultaneously.
2Ease of manufacture
If traditional heatsinks are used, then manufacturing is simpler, but heat dissipation efficiency is insufficient leading to reduced LED lifespan
Solution Approach 1:
The heatsink employs variable fin heights as a parameter change strategy. By varying the height parameter across different zones of the heatsink, the design optimizes heat dissipation in different thermal zones without fundamentally changing the manufacturing process. The fins can still be produced using standard extrusion or casting techniques, maintaining ease of manufacture while significantly improving heat transfer efficiency.
3Ease of manufacture
If uniform heat fins are used, then manufacturing is easier, but heat reabsorption occurs reducing cooling efficiency
Solution Approach 1:
The patent implements asymmetric fin heights arranged in specific patterns across the heatsink surface. This asymmetry prevents hot air from stagnating and being reabsorbed by uniform surfaces, as the varying heights create continuous upward flow paths and eliminate dead zones where heat could be reabsorbed. The asymmetric design maintains compatibility with standard manufacturing processes while effectively eliminating heat reabsorption issues.
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 heatsink effectively dissipates heat generated by LEDs, improving the performance and lifespan of LED units by reducing thermal reabsorption and enhancing cooling efficiency, allowing for flexible light distribution and luminosity adjustments.
Implementation Method 1
enhance heat dissipation through natural and forced convection
Implementation Method 2
heatsink with variable height heat fins made from aluminum or aluminum alloys, which are thermally connected to the LED printed circuit boards
Data Source
AI summary
A heatsink for cooling at least one LED may have a longitudinally extending channel flanked on each side by a longitudinally extending column of heat fins.