LED Street Lighting technical characteristics of detailed
LED lighting industry lighting project, both by the global environment, but also its industry specificity. The LED Street Lighting power supply is precisely the most important LED development, LED technology for the relevant design, there are a variety of programs and unique design techniques, we will come to one by one to understand.
1LED Street Lighting power supply why must constant it
The characteristics of LED lighting materials determine its impact by the environment, such as temperature changes, LED current will increase, the voltage increases, LED current will increase. Long over the rated current work, will greatly shorten the LED lamp life. The LED constant current is in the temperature and voltage and other environmental factors change, to ensure that its working current value unchanged.
2LED Street Lighting power supply current is how much is the most appropriate
For example, the rated current of the LED 350 mA, and some of the factory used to do, the design of 350 mA, in fact, this work under the current heat is very serious, after several comparative tests, designed to 320 mA is ideal The Try to reduce the amount of heat, so that more power into visible light. In the case of
3LED street light power board and parallel to the wide voltage to how wide it
To make the LED Street Lighting power supply work in a wide range of input voltage range AC85-265V, the light board LED string parallel way is very important. Try not to use wide voltage, can be divided into AC220V, AC110V as much as possible classification, so as to ensure power supply reliability.
There is also a wide voltage scheme, APFC active power compensation is to use L6561 / 7527 to raise the voltage to 400V, and then buck, the equivalent of two switching power supply. This program is used under certain conditions. In the case of
4 Isolated / non-isolated
General isolation power supply such as made 15W, on the LED lights in the power supply, the transformer is very large, it is difficult to put in. Mainly to see the spatial structure, depending on the specific circumstances, the isolation can only be done in general 15W, more than 15W very little, and the price is very expensive
Therefore, the isolation of the price is not high, generally non-isolated accounted for more mainstream, the volume can be done smaller, the minimum can be high 8 mm, in fact, non-isolated security measures done, there is no problem. Space allows you to do isolation power supply. In the case of
5 how can we do the power and lamp beads board match
(Such as 7X1WI> 350mA, or V <20V); or the current is too small, the voltage is too high (such as the current is too small, the voltage is too high (such as 7X1WI> 350mA, or V <20V); I <200mA or V> 25V), the result is severe heat, low efficiency, or insufficient input voltage range.
In fact, choose a best string and parallel way, plus the voltage and current on each LED is the same, and the power of the effect can play the best performance. The best way is to first communicate with the power supply manufacturers, tailor-made. Or own production power.
6LED Street Lighting power supply efficiency
Input power minus the output power value, this parameter is particularly important, the greater the value of the lower efficiency, it means that a large part of the input power into heat out. So that efficiency is the most fundamental factor in determining the power life, the efficiency can not be too low, otherwise consumed in the power of the heat is too large. Non-isolated efficiency is higher than the isolation, generally more than 80% on it, but the efficiency of the matching with the light board connection. In the case of
7LED Street Lighting power supply cooling
Cooling program is the main factor LED Street Lighting power beads in the use of thermal conditions can greatly extend the life, the general use of aluminum, easier to heat. That is, LED Street Lighting power beads posted on the aluminum plate, the external as far as possible to expand the cooling area.