Hollow Heat-Transfer Member for LED Thermal Management
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Solution Overview
Problem
Conventional LED lighting apparatuses face challenges in enhancing heat transfer performance without increasing the size of the apparatus, which leads to deteriorated performance due to heat generation affecting LEDs and circuit components.
Innovation Solution
The design incorporates a hollow heat-transfer member with a light guiding member that covers the heat-transfer member, allowing for efficient heat transfer through a large surface area, including a spherical head portion and a circular truncated cone body, with materials like aluminum for thermal conductivity and polycarbonate for thermal resistance, and strategically positions the light source to enhance natural convection cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the surface area of the heat transfer surface is increased to enhance heat transfer performance, then the heat transfer performance is improved, but the size of the lighting apparatus increases
Solution Approach 1:
The light guiding member is nested within the hollow heat-transfer member, with the light source positioned inside the hollow structure. This nested configuration allows the light guiding member to utilize the internal space of the heat-transfer member, enabling the light source to be disposed on the inner surface while maintaining compact overall dimensions. The nested structure effectively increases heat transfer surface area without proportionally increasing the external size of the apparatus.
Solution Approach 2:
The invention transitions from a conventional planar heat transfer surface to a three-dimensional hollow spherical structure. By forming the heat-transfer member as a hollow sphere with the light source positioned on its inner surface, the heat transfer occurs across the entire inner surface area of the sphere, effectively utilizing spatial dimensions to maximize heat transfer surface area within a compact volume.
2Illumination intensity
If LEDs with higher luminance are used to increase total luminous flux, then the luminous output is improved, but the heat generation increases causing deteriorated performance
Solution Approach 1:
The invention converts the harmful heat generated by high-luminance LEDs into a beneficial feature by positioning the light source on the inner surface of the hollow heat-transfer member. The heat is efficiently transferred through the member's walls to the surrounding environment, allowing the use of high-power LEDs that generate more light while simultaneously managing the heat through the dedicated heat transfer structure.
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 effectively enhances heat transfer performance, maintains luminous flux comparable to incandescent bulbs, and prevents overheating of the power circuit, ensuring efficient cooling and uniform luminance distribution without enlarging the apparatus.
Implementation Method 1
a light guiding member 12 that guides light from the light source 13 through total internal reflection to transmit the light to an outer surface
Implementation Method 2
a hollow heat-transfer member 11 that transfers heat from the light source 13 to an outer surface
Implementation Method 3
transfers the heat to the outside from another surface (heat transfer surface) of the base, which is held in contact with the ambient air
Data Source
AI summary
A lighting apparatus, comprising: a light source that emits light; a hollow heat-transfer member including an outer surface on which the light source is disposed; and a light guiding member that covers the light source and at least part of the outer surface along the outer surface.