Why 1, LED solar street lamp power supply must be constant current?
LED lighting materials are greatly influenced by the environment, on its characteristics such as higher temperature changes, the LED current increases, the increase of voltage, current of the LED will increase.
More than rated current job for a long time, can greatly shorten the service life of the LED lamp bead.
And the LED constant current is in the environmental factors such as temperature and voltage changes, to ensure the working current value remains the same.
2, LED solar street light
power constant current precision constant current precision of some power supply on the market, constant current, such as a recommendation from the popular market, error of 8%, constant current error is too big.
General requirements at 3%.
According to the design of 3%.
Production of power supply to fine-tune can achieve 3% error.
3, LED the working voltage of power supply generally LED solar street lamp, recommend the working voltage is 3.
5 v, through the test, most of the work in 3.
2 v, so press 3.
2 v calculation formula is reasonable.
Total N lamp bead series voltage = 3.
2 * N4 interchange, LED solar street light how much is the current of the power supply is the most suitable LED the rated current of 350 ma, for example, some factories use from the start, design 350 ma, actually this electrical work shed fever is very serious, through the contrast test for many times, designed to be 320 ma is ideal.
To minimize the calorific value, let more electricity into visible light.
5, LED solar street lamp series parallel with wide voltage power supply board more wide?
To make the solar LED street lamp power supply work in the input voltage range is wide range AC85 -
265 v, the LED lamp board series parallel way is very important.
Try not to use, wide voltage can be divided into AC220V, AC110V classified as far as possible, so as to ensure that the power supply reliability.
As a result of current power supply is not commonly isolated step-down type constant current power supply, when required voltage 110 v, output voltage not over 70 v, serial number of not more than 23 string.
Output voltage when the input voltage 220 v to 156 v.
That is to say, the serial number of not more than 45 series.
Parallel number not too much, otherwise the working current is too large, power supply heating.
Solution, there is a wide voltage APFC active power compensation is to use the L6561/7527 the voltage up to 400 v, and then step down, the equivalent of two switching power supply.
This scheme use only under certain conditions.
6, isolation/non isolated general power made 15 w, such as on LED solar street light power tube, its transformer volume is very big, it is difficult to put in.
Basically see space structure depending on the specific situation, isolated normally only do 15 w, little more than 15 w, and the price is very expensive.
So segregation ratio is not high, generally is the isolation of the mainstream is more, the volume can be made smaller and the smallest can do 8 mm high, in fact, the isolation security measures ready, there is no problem.
Space allows can also do the isolation power supply.
7, LED solar street light power wants how to just can accomplish and lamp bead board match?
Some customers design good lamp panel first, then find the power supply, find it difficult to have a suitable power supply, voltage or current is too big, too small (
Such as 7 x1wi & gt;
350 ma, or V<
Voltage or current is too small, too high (
Such as I<
200 ma or V>
, the result is calorific, efficiency is low, or the input voltage range is not enough.
In fact, choose one of the most excellent way of string and add on each LED voltage current is the same, the effect of the power supply, can play the best performance.
Is the best way to communicate with power supply manufacturer, tailored.
Or own production power.
8, LED solar street light power efficiency power input minus power output value, this parameter is particularly important, the bigger the value is, the less the efficiency, means that a good portion of the input power is converted into heat;
If it is installed in the lamp will generate a very high temperature, plus we have LED a photosynthetic efficiency than send out quantity of heat, can produce higher temperature superposition.
And all electronic parts within our power supply will increase with increasing temperature and shorten service life.
So efficiency is the most fundamental factor decision power life, efficiency cannot be too low, otherwise consume too much heat on the power supply.
The isolation type isolation method is more effective than type, generally over 80% is ok, however, the efficiency of matching with the lamp panel method.
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