LED Lamp Heat Sink Layout With Dual Channels for High-Power Cooling
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Solution Overview
Problem
High-power LED lamps face significant challenges with heat dissipation, leading to reduced lighting efficiency and a shorter lifespan due to ineffective waste heat management.
Innovation Solution
The LED lamp design incorporates a passive heat dissipating element with a heat sink featuring fins and a base, along with two heat dissipating channels for air flow to facilitate natural convection and radiation, ensuring efficient heat transfer from the power source and LED chips to the exterior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power LED lamps are used to increase luminous flux, then lighting efficiency and brightness are improved, but heat generation increases leading to reduced lifespan and lighting efficiency
Solution Approach 1:
The heat dissipation system is segmented into two independent channels: first channel for power source heat dissipation and second channel for LED chip heat dissipation. Each channel has dedicated air intake and exhaust paths, allowing separate optimization of heat removal for each heat-generating component without thermal interference
Solution Approach 2:
The heat sink acts as an intermediary thermal management component between the LED chips and the external environment. It features a base that contacts the LED chips and fins that extend outward for heat dissipation, mediating the heat transfer process through conduction from chips to base and convection/radiation from fins to air
2Reliability
If heat dissipation structure is added to manage waste heat, then lifespan and lighting efficiency are improved, but device complexity and weight increase
Solution Approach 1:
The heat sink combines multiple functions into a single component: it serves as both the thermal management element (with base and fins for heat dissipation) and part of the air flow channel structure (with defined intake and exhaust paths). This merging reduces the need for separate heat dissipation components and simplifies the overall design
Solution Approach 2:
The heat dissipation system operates passively using natural convection currents created by temperature differences. Hot air rises through the exhaust channels and cooler air is drawn in through intake channels without requiring active fans or pumps, making the system self-regulating and reducing mechanical complexity
3Loss of energy
If heat sink with fins is used to increase heat dissipation area, then heat dissipation efficiency is improved, but volume and weight of the lamp increase
Solution Approach 1:
The heat sink utilizes the radial dimension by extending fins outward from the central base in a circular arrangement. This radial extension provides large heat dissipation surface area without significantly increasing the axial height or overall volume of the lamp, efficiently using the available lateral space
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 design effectively prolongs the lifespan of LED lamps by maintaining lighting efficiency through enhanced heat dissipation, achieving a power-to-heat-dissipating-area ratio of 1:20-30 and supporting luminous flux of at least 25000 lumens with a weight under 1.7 Kg.
Implementation Method 1
a heat sink connected to the lamp shell, wherein the heat sink comprises fins and a base
Implementation Method 2
two heat dissipating channels for air flow to facilitate natural convection and radiation
Implementation Method 3
two heat dissipating channels for air flow to facilitate natural convection and radiation
Implementation Method 4
a second channel defined in the heat sink and between the fins and the base for dissipating the heat of the heat sink, which is generated from the LED chips and transferred to the heat sink
Data Source
AI summary
An LED (light emitting diode) lamp comprising: a lamp shell; a passive heat dissipating element having a heat sink connected to the lamp shell, wherein the heat sink comprises fins and a base; a power source disposed in the lamp shell; a light emitting element connected to the base of the heat sink of the passive heat dissipating element and comprising LED chips electrically connected to the power source; a first channel defined in a chamber of the lamp shell for dissipating heat generated from the power source while the LED lamp is working; and a second channel defined in the heat sink and between the fins and the base for dissipating the heat of the heat sink, which is generated from the LED chips and transferred to the heat sink; wherein the first channel comprises a first end on the light emitting element to allow air flowing from outside of the LED lamp into the chamber, and a second end on the upper portion of the lamp shell to allow air flowing from inside of the chamber out to the LED lamp; wherein the second channel comprises a third end on the light emitting element to allow air flowing from outside of the LED lamp into the second channel, and flowing out from spaces between every adjacent two of the fins; wherein the light emitting element further comprises an aperture communicating simultaneously with both the first channel and the second channel by connecting with the first end of the first channel and the third end of the second channel.