Concentric Segmented Fin Heat Sink for LED Thermal Isolation
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Solution Overview
Problem
LED light fixtures face challenges in thermal management, leading to reduced reliability and lifespan due to inefficient heat dissipation and potential heat transfer between light emitters and driver circuits, as well as limited optical redirection for uniform illumination.
Innovation Solution
A heat dissipation structure with concentric fin sets and a reflector system that thermally couples light emitters and driver circuits to specific fin sets, minimizing heat transfer and redirecting light emissions for improved thermal management and optical distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light emitters and driver circuits are mounted on the same circuit board without thermal separation, then device complexity is reduced, but heat transfer between components increases causing reduced reliability
Solution Approach 1:
The heat dissipation structure is segmented into multiple independent heat dissipation regions, each with dedicated fin sets. Light emitters are thermally coupled to first heat dissipation regions with first fin sets, while driver circuits are thermally coupled to second heat dissipation regions with second fin sets. This segmentation creates thermal isolation between components while maintaining structural integration on a single circuit board.
Solution Approach 2:
Different regions of the circuit board are赋予 different thermal properties through localized heat dissipation structures. The first and second heat dissipation regions have different thermal characteristics optimized for their respective components (light emitters vs. driver circuits), allowing each component to operate in its optimal thermal environment while using the same base circuit board.
2Ease of manufacture
If conventional heat dissipation structures are used without concentric fin segmentation, then manufacturing is simpler, but heat dissipation efficiency decreases leading to increased temperature
Solution Approach 1:
The heat dissipation structure employs concentric fin sets arranged in multiple segments radiating from a central axis. Each fin set extends radially outward and is positioned to maximize surface area exposure to ambient air. This segmented concentric arrangement significantly increases the effective heat dissipation surface area compared to conventional single-block heat sinks, enabling more efficient thermal management.
Solution Approach 2:
The heat dissipation structure transitions from conventional planar or simple three-dimensional forms to a radial concentric configuration. The fins extend in multiple dimensions from the circuit board surface, creating a three-dimensional heat dissipation architecture that maximizes surface area-to-volume ratio and enhances convective heat transfer to surrounding air.
3Device complexity
If light emitters are positioned without optical redirection, then optical system complexity is reduced, but illumination uniformity decreases
Solution Approach 1:
The reflector is formed with a curved reflective surface that redirects light emissions from the light emitters. The curvature of the reflector is designed to distribute light rays uniformly across the target area, transforming the directional light output of the emitters into a more uniform illumination pattern. This curved geometry enables effective light redirection without adding complex optical components.
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
Enhances thermal dissipation, increases component reliability, and provides uniform illumination by minimizing heat transfer between light emitters and driver circuits while optimizing light redirection.
Implementation Method 1
a plurality of concentric fin sets extending from a first side of the first housing member... first and second sets of an adjacent concentric pair of the plurality of concentric fin sets defining a first open channel therebetween
Implementation Method 2
heat dissipation structure defining a first housing member... thermally coupled to a side of the first housing member
Implementation Method 3
A reflector spans between the circuit board and a second housing member... redirect light emission to a first direction perpendicular to the first side of the first housing member
Data Source
AI summary
An LED light fixture includes a heat dissipation structure defining a first housing member and a plurality of concentric fin sets. A circuit board is thermally coupled to a side of the first housing member opposite the concentric fin sets, a plurality of light emitters is thermally coupled and mounted to a region of the circuit board overlying a first set of concentric fins, and a driver circuit is coupled and mounted to a region of the circuit board overlying a second set of concentric fins. A reflector spans between the circuit board and a second housing member, and a lens spans between the first and second housing member and provides light transmission therethrough.