SSL Thermosiphon Liquid Cooling Channel Loop
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Solution Overview
Problem
Conventional solid state lighting (SSL) devices, particularly LEDs, face heat-related issues that lead to deterioration of semiconductor and optical components, causing a decrease in color fidelity over time due to the rapid degradation of converter materials at higher temperatures.
Innovation Solution
The implementation of a closed-system cooling fluid channel loop within the SSL device, utilizing a dielectric coolant fluid that circulates through a recirculation system, including channels and a heat sink with thermally conductive projections, to effectively manage heat dissipation and maintain the operating temperature of the SSL devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods are used in SSL devices, then device simplicity is maintained, but heat dissipation efficiency is insufficient leading to component deterioration
Solution Approach 1:
The patent employs a liquid cooling system where coolant flows through channels in contact with semiconductor emitters to absorb and remove heat. This hydraulic approach enables efficient thermal management by circulating fluid through thermally conductive pathways, directly addressing the heat dissipation challenge while managing system complexity through integrated channel design.
Solution Approach 2:
The cooling channels are integrated within the support structure itself, with channels formed inside the support body that直接接触 semiconductor emitters. This nested configuration allows the cooling system to be embedded within the existing device architecture, improving heat dissipation without proportionally increasing overall device complexity.
2Power
If higher operating temperatures are allowed, then device power output can be increased, but converter material deteriorates rapidly reducing color fidelity
Solution Approach 1:
The patent implements localized cooling by placing cooling channels in direct contact with or adjacent to semiconductor emitters, creating high-heat-flux zones with enhanced cooling capacity. This local quality approach ensures that critical areas generating heat receive intensive cooling, maintaining converter material stability while allowing high power operation in these specific zones.
Solution Approach 2:
The coolant acts as an intermediary substance that transfers heat from semiconductor emitters to the cooling channels and ultimately to the external environment. This intermediary mechanism enables the system to sustain high power output by continuously removing heat through the coolant circulation, preventing converter material deterioration.
3Temperature
If passive cooling structures are used, then device complexity is reduced, but heat removal capacity is insufficient for high-power emitters
Solution Approach 1:
The patent transitions from two-dimensional surface cooling to three-dimensional volumetric cooling by forming channels within the support structure. This dimensional change allows coolant to penetrate deeper into the thermal field, significantly enhancing heat removal capacity. The volumetric cooling approach provides superior thermal management compared to surface-level passive structures while maintaining integrated design.
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 solution enhances the thermal management of SSL devices, reducing the deterioration of components and maintaining color fidelity by efficiently transferring heat away from the semiconductor emitters, thereby extending the lifespan and performance of the devices.
Implementation Method 1
The upward channel 620a can be in fluid communication with the downward channel 620b by an upward return 615a above the SSE 140 and a downward return 615b below the SSE 140
Implementation Method 2
The SSL device 600 can include a lens 662 aligned with the active portion 142
Implementation Method 3
The side section 516, the base 118, and the lens 160 define a chamber 530 containing a transparent coolant fluid
Data Source
AI summary
A solid state lighting (SSL) device with a solid state emitter (SSE) being partially exposed in a channel loop, and methods of making and using such SSLs. The SSE can have thermally conductive projections such as fins, posts, or other structures configured to transfer heat into a fluid medium, such as a liquid coolant in the channel loop. The channel loop can include an upward channel in which the SSE is exposed to warm the coolant in the upward channel, and a downward channel through which coolant moves after being cooled by a cooling structure. The coolant in the channel loop can naturally circulate due to the heat from the SSE.