2011年11月21日星期一

Thermal simulation to simplify the development of LED light source


Any form of electrical lighting products have a negative product: heat. Incandescent lighting to fluorescent lighting from generation to generation engineers in R & D will minimize heat or heat from the light source separation methods or equipment. However, LED spotlight, currently to continuously improve the quality and increasing form, bringing a new and different challenges.
The development will reduce the heat LED light output, causing the color change, while reducing component life. Said thermal management is by far, the most critical of the LED system design aspects. From an engineer's point of view, this means learning across the structure and tools commonly used in electronic design, electronic design to be familiar with the structure and outside the scope of the process. Fortunately, we already have thermal design solutions, validation and testing in the heat challenges, design engineers can help simplify the road.
Developing a new light system, must verify the most basic product concept, the structural and aesthetic ideas and thermal properties of the actual needs can be unified.
The key success of the LED system design activities, equipment, heat is effectively carried over from its move to the PN environment. PCB and solder the LED housings are involved in the heat flow path. Design engineer must determine the transfer of heat in the shell and shields demonstrated efficiency. Series of physical samples manufactured and tested to verify this is expensive and requires more time, therefore, has the early stages of design engineers in the design of commonly used software-based approach.
More popular approach is to use computational fluid dynamics (CFD = Computational Fluid Dynamics) analysis to simulate the planned virtual devices. For early design concepts, this approach to be flexible than building a lot of physical samples, and just as effective. That the characteristics of a good virtual model, the physical samples can be clear on the basis of what works and what does not. All along, CFD simulation by some of the fluid with a high-level data and analysis of background people to operate, it requires the implementation of personnel in the analysis of complex CFD modeling tools.

The latest CFD technology development will be brought to the structural engineer's desktop, greatly simplifying and speeding up the analysis. The new process, that is synchronized CFD, the preparation and execution of simulation steps to automate most of the work required. Seamless integration with common MCAD in the environment, such as Pro / ENGINEER ®, making the structural engineers can design a new light source to create a virtual simulation model, and detect heat dissipation.
Design verification of the bottom line, whether the product is a new source or modify an existing design, should be a detailed understanding of the thermal performance of LED bulb. If the development of new LED lamps in place of existing equipment, then learn more about the thermal performance is also very important, because the original installation of thermal performance and lighting facilities is the key.
Thermal data from LED suppliers should get the hands, although in the current industry standard in the absence of such information, product specifications in the printing, the information provided is usually not comprehensive enough. For example, the thermal performance data are usually provided, but it may not include the operating temperature range, the actual end-user systems in which the temperature of the work areas. However, design engineers must rely on LED manufacturer's data or simple models to evaluate the implementation of light, or in-house testing, or start early light design.

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