Lighting Device Thermal Management via Driver Heat Sink Separation
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Solution Overview
Problem
Current LED-based lighting devices face thermal performance issues due to the proximity of LEDs and drivers to a shared heat sink, which degrades the driver components and requires expensive thermal potting materials, complicating assembly and recycling.
Innovation Solution
The lighting device separates the driver and light source thermally and spatially by placing the heat sink away from the driver, reducing heat transfer and eliminating the need for thermal potting material, while exposing a portion of the connecting wire to resemble an incandescent filament, enhancing thermal performance and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the driver is fixed in a cavity of the heat sink by thermal glue (or thermal potting material), then heat dissipation from the driver is enhanced, but assembly and recycling become more cumbersome and material costs increase
Solution Approach 1:
The driver is extracted from the heat sink cavity and placed on the base, eliminating the need for thermal glue or potting material. This extraction resolves the contradiction by removing the harmful thermal contact while simplifying assembly and recycling processes, as the driver can now be easily removed without adhesive removal.
2Device complexity
If the LEDs and driver are arranged in proximity and connected to the same heat sink, then device structure is simplified, but the driver components degrade over time due to heat exposure
Solution Approach 1:
The thermal management system is segmented into separate heat sinks: one for the LEDs (in the upper portion) and one for the driver (on the base). This segmentation resolves the contradiction by physically separating the heat sources, allowing each component to be cooled independently without thermal interference, thereby improving driver reliability while maintaining structural simplicity.
Solution Approach 2:
A thermally insulating reflector is introduced as an intermediary between the upper portion containing LEDs and the base containing the driver. This reflector prevents heat transfer from the LED heat sink to the driver, resolving the contradiction by blocking thermal pathways while maintaining a compact structure.
3Temperature
If the wire connecting LED to driver is completely covered by the reflector, then thermal insulation is improved, but the lighting device fails to resemble incandescent lighting devices
Solution Approach 1:
The reflector is designed with local quality variation: it covers most of the wire for thermal insulation, but deliberately leaves a portion exposed. This local differentiation resolves the contradiction by maintaining thermal insulation where needed while creating a visible filament-like structure that provides aesthetic resemblance to incandescent bulbs.
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 performance, increases the light source's input power, reduces material costs, and enhances the resemblance to incandescent lighting devices, increasing the adoption of LED-based replacements by improving their aesthetic and functional similarity.
Implementation Method 1
Heat from the light source is dissipated via the heat sink
Implementation Method 2
A portion of the wire extending from the base to the portion of the lighting device is arranged to be exposed to light from the light source
Data Source
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AI summary
A lighting device (1) comprising a driver (7) arranged at a base (2) of the lighting device (1), a heat sink (14) arranged at a portion (3) of the lighting device (1), separate from the driver (7), a light source (13) mounted to the heat sink (14), and a wire (10) arranged to electrically connect the light source (13) to the driver (7), wherein a portion of the wire (10) extending from the base (2) to the portion of the lighting device (1) is arranged to be exposed to light from the light source (13). The present embodiment is advantageous in that the thermal performance is improved and the lifetime of the lighting device (1) is increased. Further, the exposed wire (10) may be illuminated by the light source (13) and visible from outside the lighting device (1), thereby having the appearance of a filament.