LED_Turku_MS2013.pdf-KEEPINGLEDSCOOLGETSMORE方案.PDFVIP

S p e c i a l A d v e r t i s i n g S e c t i o n L E D S KEEPING LEDS COOL GETS MORE MANAGEABLE THROUGH SIMULATION Fast and accurate design and validation methods for price-sensitive and high- volume products like lighting devices can make all the difference in the bottom line By DEXTER JOHNSON LIGHT-EMITTING DIODE (LED) light sources are continu- ally displacing incandescent lighting in general lighting environments. The reasons for this are that LED lights have relatively long life spans; they possess a high lumi- nous efficiency; and they are environmentally friendly. A warm glow from a cool competitor: LED light bulbs offer a Though LEDs have quickly become ubiquitous in long-lasting and environmentally friendly option in lighting. general lighting environments, the number of applica- tions for them beyond lighting has grown even faster. These new applications now range from video dis- heat well. When this substrate is mounted effectively on plays to advanced communications technologies. an efficient heat sink, the heat is released into the ambi- But LEDs don’t come without a few drawbacks. LED ent air. Since the adjacent surfaces of the LED module and lights generally cost more than their incandescent cous- the heat sink are not entirely smooth, some amount of ther- ins, and their temperature has to be carefully regulated. mal interface material (TIM), typically thermal grease, is This heat issue stands in stark contrast to traditional light- added between the surfaces. Highly polished surfaces need ing sources, in which heat is actually needed in order for only a very small amount of grease. the device to produce a significant amount of visible light. This is exactly the same solution used between micro- To understand