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10 basis led fluorescent lamp tube lights do you seldom know

LED fluorescent lamp tube lights power is a very important part of LED fluorescent lamp tube lights, if not properly chosen, LED fluorescent lamp tube lights can not play his due performance, and even may not be able to use the normal lighting. LED fluorescent lighting on the following power to do some small recommendations for your reference.

At present, LED fluorescent lighting market is more active, LED drive power supply manufacturers are divided into three major types:

The first is to develop LED chips or LED lights to do the factory, homeopathic infiltration to the downstream;

The second is to do the original general lighting factory;

The third category is completely new factories, they used to do power or other products or new business.

LED fluorescent lamp tube lights power is a very important part of LED fluorescent lamp tube lights, if not properly chosen, LED fluorescent lamp tube lights can not play his due performance, and even may not be able to use the normal lighting. LED fluorescent lighting on the following power to do some small recommendations for your reference.

1, LED fluorescent lamp tube lights power supply must be why the constant it?

LED semiconductor properties of the decision by its environmental impact, such as temperature, LED current will increase; voltage increases, LED current will increase.

Long-term work than the rated current, will greatly shorten the LED life. The LED constant current is the temperature and voltage and other environmental factors change, to ensure that its operating current unchanged.

2, LED fluorescent lamp tube lights power to how to match with the light?

(Eg I> 350mA, V <40V); or the current is too small, the voltage is too high (such as I ), the current is too small, 40mA, V> 180V), the result is a serious fever, low efficiency, or input voltage range is not enough.

In fact, choose one of the best string and parallel connection, plus the voltage and current on each LED is the same, while the power supply effect is able to play the best performance. The best way is to communicate with the power supply manufacturers, tailored.

3, LED fluorescent lamp tube lights power supply current is the number of the most appropriate?

General LED rated current 20 mA, and some factories used to start out to design 20 mA, in fact, this current is very serious fever, after repeated comparison test, designed to 17 ~ 19 mA is the comparison Ideally, the recommended design is 18 mA.

4, LED fluorescent lamp tube lights power supply voltage is how much?

General LED recommended operating voltage is 3.0-3.5V, the test, most of the work in 3.125V, so by 3.125V calculation formula is reasonable. The total voltage of M lamp beads in series = 3.125 * M.

5, LED light board series and parallel and wide voltage to more wide?

To make the LED fluorescent lamp tube lights work in the input voltage range of a wide range (full voltage) AC85 ~ 265V, the light board of LED string and parallel mode is very important.

As the current power supply is generally non-isolated buck power supply, wide voltage requirements, the output voltage should not exceed 72V, the input voltage range can reach 85 ~ 265V. That is, the concatenation number does not exceed 23 strings.

Parallel number not too much, otherwise the working current is too large, serious fever, it is recommended 6 and / 8 and / 12 and. The total current is not more than 240 mA.

There is a wide voltage program, first with the L6561 / 7527 to raise the voltage to 400V, and then buck, which is equivalent to two switching power supply, cost twice as expensive, this program cost is not high, there is no market.

6, LED series and parallel and PFC power factor and the relationship between wide voltage is what?

There are three kinds of power supply PFC on the market at present:

One is not with PFC special circuit, the PFC is generally around 0.65; one is with a passive PFC circuit, light board is well prepared, PFC generally around 0.92; also used with an active active 7527 / 6561 circuit, PFC can reach 0.99, but the cost of this program than the second program twice the cost.


10 basis led fluorescent lamp tube lights do you seldom know

So more of the second program. For the passive PFC circuit: also called valley-filling PFC circuit, the operating voltage range is the AC input voltage peak half. If the input is 180V, the peak is 180 * 1.414 = 254V, half of the peak voltage is 127V, minus the pressure drop of 30V, the maximum output is 90V, so the number of LED lamp beads in series up to 28 strings.

Therefore, in order to get a larger power factor, the number of lamp beads in series can not be too much, otherwise, it can not meet the requirements of low voltage.

7, LED fluorescent power supply constant current accuracy of the number of the most appropriate?

On the market some of the power supply constant current accuracy is too bad, like the popular PT4107 / HV9910 / BP2808 / SMD802 program constant current program, the error of ± 8% or ± 10%, constant current error is too large. General requirements in ± 3% on it.

3% of the error, 6 parallel, the error of each channel of about ± 0.5%, if it is 12 parallel, each error of about ± 0.25%, the accuracy is sufficient. Accuracy is too high, the cost will be greatly increased. And the LED is concerned, 17 milliampere and 17.5 milliampere little effect.

8, Isolated / non-isolated

General isolation power, such as made of 15W, on the LED tube, the transformer volume is very large, very difficult to put in. Especially for T6 / T8 lamp, almost impossible, so the isolation can only be done in general 15W, more than 15W of the very few, and the price is very expensive.

Therefore, the cost of isolation is not high, generally non-isolated more mainstream, the volume can be done smaller, the minimum can be high 8 mm, in fact, non-isolated security measures well, there is no problem.

9, LED fluorescent lamp tube lights power efficiency

Output power (output LED voltage * output current / input power). This parameter is particularly important if the low efficiency means that a large part of the input power into heat emitted; if it is installed in the lamp will produce a very high temperature, coupled with an LED light efficiency than our The heat is distributed, it will stack to produce a higher temperature.

The life of all the electronic parts inside our power supply will be shortened as the temperature rises. So efficiency is to determine the most fundamental factor in power supply life, efficiency can not be too low, otherwise the heat consumed on the power too.

Generally more than 80% can be, but the efficiency and light board matching connection law.

10, LED fluorescent lamp tube lights power size

Height is the main limiting factor, generally used for T6 tube / T8 size requirements of height can not be too high ≤ 9 mm. T10 tube height ≤ 15 mm. Length can be long, more easy to heat.

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