The first, led high-power street light conversion of light energy calculation cement fence: bet365 Sports Online:
We all know that the conversion rate of light and electricity of led lamps is between 15% and 20%, and the remaining 80% are converted into heat energy. During their working phase, a large amount of heat is generated. Led module gathered into the led high-power street lights, then they generate more heat, heat dissipation system should not be efficient, it will make the street light emitting wavelengths are stretched, phosphor effect, street lamp aging accelerated, greatly reducing the life of led lights.
Second, the cooling method of led high-power street lamps
In general, the heat led street light will be transmitted in three ways by radiation, convection and heat, but the proportion of heat radiation share is too small, we focus on these two forms led to study convection and conduction of high-power lights, led lights The heat conduction is mainly affected by the heat sink and the shell, which determine the heat dissipation path of more than 80%.
Third, the cooling structure of led high-power street lamps
led lights heat to the main cooling fins, so the fins of the structural design is particularly critical, the conventional heat sink is usually led lights led module group and welded together, led module group is bonded to a copper pillar behind The MCPCB is linked below the copper pillars . With such a connection structure, the heat generated by the led module group can quickly be lost to the air, ensuring the safe and stable operation of the led street lamps.
Fourth, the most influential cooling efficiency MCPCB
The design of the MCPCB is the biggest factor affecting the efficiency of the LED light source. The MCPCB can be considered as the heat sink for the LED street light. The researchers found that the heat dissipation effect of the MCPCB is limited by three design criteria. They are the distance between the MCPCB fins. The height of the fins, the thickness of the fins, and the thickness of the floor.
However, the cooling function of these conditions is subject to certain conditions, the smaller the fin thickness and spacing, the better, but the manufacturing cost constraints, the main function of the floor is led led high-power street lamp led module group Thermal energy, which is too thin or too thick, is not good, so choosing the most suitable combination of values ​​becomes an important task for design.
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