LED Lamp Cooling Structure for Heat Dissipation and Light Distribution
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Solution Overview
Problem
Existing LED-based lighting solutions face challenges in achieving omnidirectional light distribution and efficient heat dissipation, often compromising on these aspects due to the design of the base plate and protective dome, which impedes both light distribution and heat management.
Innovation Solution
The design incorporates a cooling structure with radially arranged planar surfaces and protruding portions that extend outward, housing LED PCBs and driving electronics, along with light-transmissive caps and reflectors, to enhance heat dissipation and light distribution, allowing for a compact form factor with efficient thermal management and omnidirectional light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective dome is disposed over the PCB and LEDs, then the LED components are protected, but heat dissipation is compromised
Solution Approach 1:
The protective envelope is segmented into multiple sections: a lower section with first light-transmissive portions and an upper section with second light-transmissive portions. This segmentation allows different regions of the envelope to serve different functions - the lower section protects the LED components while the upper section facilitates heat dissipation and light distribution, resolving the contradiction between protection and thermal management.
Solution Approach 2:
Different portions of the protective envelope have different optical properties. The first light-transmissive portions have specific transmissivity characteristics for protecting LEDs while allowing light passage, and the second light-transmissive portions have different characteristics optimized for heat dissipation and omnidirectional light distribution. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Reliability
If a base plate is used to mount the dome, then the dome is supported and protected, but omnidirectional light distribution is impeded
Solution Approach 1:
The mounting structure transitions from a two-dimensional base plate to a three-dimensional configuration where the lower section of the protective envelope is integrated with the PCB assembly. This dimensional change eliminates the base plate obstruction, allowing light to distribute omnidirectionally in all directions including downward, while the integrated structure still provides necessary support and protection.
Solution Approach 2:
The protective envelope is merged with the PCB and LED assembly, where the lower section serves dual functions as both protective covering and mounting structure. This integration eliminates the separate base plate, removing the obstacle to omnidirectional light distribution while maintaining structural support and protection functions.
3Volume of moving object
If LED components are arranged inside a bulb with limited space, then the form factor is compact, but heat dissipation and light distribution are compromised
Solution Approach 1:
The upper section of the protective envelope is configured to extend beyond the lower section, creating a dynamic spatial arrangement that maximizes heat dissipation surface area and light distribution volume within the compact bulb form factor. This dynamic configuration allows efficient thermal and optical performance without increasing overall volume.
4Illumination intensity
If multiple LED PCBs are arranged radially, then omnidirectional light distribution is improved, but device complexity increases
Solution Approach 1:
The radial arrangement of LED PCBs and corresponding cooling fins serves multiple functions simultaneously: it enables omnidirectional light distribution, provides efficient heat dissipation through increased surface area, and creates a compact cylindrical form factor. This multi-functionality reduces overall device complexity by combining several requirements into a single integrated configuration.
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 enables high-output LED lamps with even luminous intensity across a wide angle, achieving greater than 600 lumens while consuming less than 10 Watts, with improved heat dissipation and light distribution comparable to traditional incandescent bulbs, maintaining a compact size and weight.
Implementation Method 1
cooling structure having a plurality of substantially planar surfaces radially arranged about the lamp axis and a plurality of protruding portions
Implementation Method 2
Each of the LED PCBs is coupled to a single of the surfaces
Implementation Method 3
The light transmittable caps are each positioned over a single of the LED PCBs and each extends between two adjacent of the protruding portions
Implementation Method 4
The lamp also includes a plurality of reflectors each placed over a single of the LED arrays and containing at least one LED opening therein
Data Source
AI summary
Disclosed is an LED-based bulb-type lamp, including a cooling structure and a plurality of LEDs thermally connected to the cooling structure. The lamp includes at least three separate LED arrays oriented substantially parallel to its central longitudinal axis, such that the LEDs are interspersed among a plurality of light-transmission sub-areas of the LED-based lamp. One or more portions of the cooling structure of the lamp extend to its outer surface, as assembled, such that light-transmissive and heat-dissipating areas are spread over the outer surface, for example, in an alternating manner.