At present, how to dissipate heat is the core problem in LED product design. Let's take a look at how the heat dissipation problem in LED lighting design should be analyzed and controlled.
First, LED lighting design heat analysis
The design of LED lighting systems below 25 watts is generally used for table lamps, living room spotlights, home dining lights, nightlights, etc. Even so, most low-power LED lighting applications smaller than 25 watts will require certain The degree of miniaturization. This often leads to higher power densities, although its power consumption is not very large. In this case, sufficient thermal management measures are required to be provided by improving the mechanical structure.
In addition, high electrical efficiency also helps reduce power consumption. Another idea to prevent LEDs from overheating for a long time is to use a dimming solution. In fact, in this power range, LED lights will replace halogen and compact fluorescent lamps. In addition, in order to get rid of heat dissipation problems, passive components that are sensitive to temperature changes must be removed.
However, most current LED driver solutions are based on, and based on, the power supply topology, so temperature limits should be considered, as general products are often based on commercial standards, but the lights must be able to accommodate harsh environments. .
Second, the heat dissipation control scheme in LED lighting design
In the rapidly evolving LED lighting design, most people focus on the dimming control strategy of high-brightness (HB) LEDs. However, the nature of HB LED lighting applications requires us to shift more attention to thermal control. While LED manufacturers are reducing the technical barriers to HB LED lighting design by dramatically increasing lumens per watt, there is still more energy converted to heat to be emitted than light output. Therefore, an overall strategy for thermal management is needed to ensure that the heat dissipated by the LED can be controlled as a function of temperature. Unlike incandescent and tungsten bulbs, high power LEDs do not radiate heat. In contrast, the LED conducts the heat of its PN junction to the heat sink metal block of the LED package. Since the heat generated by the LEDs is transmitted in a conductive manner, this heat requires a longer, more expensive path to be completely dissipated into the air. Currently, one of the biggest obstacles to the commercialization of HB LED general lighting is heat dissipation. Therefore, whether the problem can be solved completely and effectively can be said to be the key to winning customers.
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