Heat Sink With Offset Driver Zone For LED Thermal Management
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Solution Overview
Problem
Traditional LED-based lamps face challenges with high thermal resistance, insufficient space for the driver assembly, and inadequate protection of thermally sensitive components due to the compact design and arrangement of heat sinks, which limits their power and light output.
Innovation Solution
The design features a heat sink with extended radial sections to create a 'cold spot' for the driver electronics, providing more space for heat dissipating fins and separating thermally sensitive components, along with an asymmetrical fin arrangement for enhanced cooling and optical components for optimized light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact heat sink design is used, then the lamp size is reduced, but the thermal resistance increases and heat dissipation becomes insufficient
Solution Approach 1:
The heat sink is divided into multiple functional zones: a first region with a plurality of fins for primary heat dissipation, and a second region with different fin characteristics for secondary heat dissipation. This segmentation allows optimized heat transfer paths while maintaining compact overall dimensions, resolving the contradiction between small size and effective heat dissipation.
Solution Approach 2:
Different regions of the heat sink are designed with locally optimized properties: the first region has fins with specific spacing and orientation for high-heat areas near the LED, while the second region has differently configured fins for lower-heat areas. This local quality optimization enables effective heat dissipation in a compact form factor.
2Length of moving object
If the driver assembly is positioned close to the light source, then the thermal path is shortened, but thermally sensitive components are exposed to high temperatures
Solution Approach 1:
The driver assembly is extracted from the high-temperature zone near the light source and positioned in a separate location within the lamp housing. This spatial separation removes the thermally sensitive driver components from the harmful thermal environment while maintaining reasonable electrical connection lengths, resolving the contradiction between short thermal paths and temperature protection.
Solution Approach 2:
A thermally conductive but electrically isolating interface is introduced between the light source mounting area and the driver assembly mounting area. This intermediary structure allows thermal management while protecting sensitive electronic components from direct heat exposure, enabling both short thermal paths and temperature protection.
3Volume of stationary object
If the central aperture of the heat sink is large, then the driver assembly has more space, but the volume for heat dissipating fins is reduced
Solution Approach 1:
The heat sink design transitions from a traditional centralized aperture layout to a distributed fin structure where fins extend in multiple directions from a reduced central aperture. This dimensional reorganization provides both adequate driver assembly space and sufficient fin volume for heat dissipation by utilizing three-dimensional space more efficiently.
Solution Approach 2:
The driver assembly is nested within the heat sink structure in a manner that utilizes the space around and between the fin structures. The compact driver housing is positioned to fit within the overall heat sink envelope without significantly compromising the fin volume, allowing both adequate driver space and 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 configuration improves thermal resistance by over 20%, increases the space for the driver assembly, and effectively protects sensitive components from high temperatures, allowing for higher power operation and enhanced light output.
Implementation Method 1
a heat sink (2), the heat sink comprising a top side (25) and a bottom side (24)... a plurality of fins (21) adapted for dissipating heat are extending on opposite sides of the central space
Implementation Method 2
a plurality of fins (21) adapted for dissipating heat are extending on opposite sides of the central space... resulting in an insufficient air flow
Data Source
AI summary
A lamp comprising a driver assembly, the driver assembly including a driver board with driver electronics, at least one point light source and a heat sink, the heat sink including a top side and a bottom side, a central space extending from the bottom side to the top side and adapted for receiving the driver board of the driver assembly, a zone provided at the top side and adapted for receiving the at least one point light source, wherein a plurality of fins adapted for dissipating heat are extending on opposite sides of the central space, and an extension of the central space in at least one radial direction of the heat sink is larger than an extension of the zone in the radial direction of the heat sink such that the central space is provided with at least one section arranged offset from and radially adjacent to the zone.