LED Light Engine Alignment Features for Thermal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Designing high-power LED light engines for non-Class 2 systems poses challenges in meeting safety standards such as UL8750 and EN 61347 due to increased power and voltage requirements, which complicates the integration of safety features like flame retardancy and thermal management.
Innovation Solution
The design incorporates a flexible printed circuit (FPC) with LEDs arranged symmetrically or asymmetrically around a circular loop, a light guide plate with a dispersive pattern, and a reflector to achieve uniform light distribution while using a flame-retardant material and thermal management strategies like gap fillers and thermal dissipation enhancements to meet safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of LEDs and power supplied by the power supply are increased beyond Class 2 limits, then the lighting output and power usage are improved, but safety compliance and electrical risk increase
Solution Approach 1:
The patent divides the LED array into multiple independent modules, each with its own driver circuit. This segmentation allows the system to exceed Class 2 power limits while maintaining safety through modular isolation, where each module operates within safe electrical parameters individually but collectively provides high-power lighting output.
Solution Approach 2:
The patent introduces a non-flammable barrier material as an intermediary between the electrical components and the surrounding environment. This barrier acts as a safety mediator that allows high-power operation by preventing electrical hazards from propagating, thus enabling power levels beyond Class 2 limits while maintaining safety compliance.
2Illumination intensity
If high-power LEDs are used to increase lighting output, then the illumination intensity is improved, but thermal management challenges and safety risks increase
Solution Approach 1:
The patent implements localized thermal management by positioning heat sinks and cooling channels directly adjacent to high-power LED modules. This local quality approach ensures that heat is dissipated at the source, preventing thermal accumulation while maintaining high illumination output. The cooling structure is strategically designed to target specific high-heat-generation zones.
Solution Approach 2:
The patent converts the harmful thermal energy generated by high-power LEDs into a beneficial cooling mechanism. By integrating heat sinks and thermal management structures that actively draw heat away from LEDs, the system transforms waste heat into a controlled thermal flow that prevents overheating while enabling sustained high-power operation.
3Manufacturing precision
If alignment features are added to ensure proper positioning of LED modules, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent incorporates alignment features such as positioning protrusions and recesses that are pre-formed during the molding process. These features perform the alignment function in advance, guiding LED modules into correct positions during assembly without requiring complex adjustment mechanisms or additional alignment steps, thus maintaining manufacturing precision while minimizing added complexity.
Solution Approach 2:
The patent merges the alignment function with the structural support elements of the LED module housing. By integrating positioning features into the existing structural components rather than adding separate alignment mechanisms, the patent achieves precise alignment while avoiding unnecessary increases in device complexity.
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
The solution enables the creation of high-power LED light engines that meet safety standards by ensuring uniform light distribution, effective thermal management, and compliance with regulatory requirements, while minimizing the risk of electrical shock and fire.
Implementation Method 1
a reflector with a gasket and thermocouple for temperature measurement
Implementation Method 2
along with a metal chassis and backplate for thermal dissipation
Data Source
AI summary
A lighting engine, system and method of fabrication are described. The system contains a flexible printed circuit (FPC) shaped as a loop. LEDs are mounted on the FPC to emit light toward a center of the loop. A light guide positioned in an interior of the loop receives light emitted by the LEDs through an edge of the light guide. The light guide has slots formed therein that receive locator pins to limit thermal displacement of the light guide towards the LEDs. Other apparatuses, systems, and methods are also disclosed.