LED lighting industry lighting project, both by the global environment and its industry specificity. LED Street light power supply is the current LED development of the most important for LED Street light power supply technology-related design. There are already a variety of programs and unique design techniques. The following will explain in detail for you.

1. LED Street light power supply why must be constant current?

The characteristics of LED Street lighting materials determine their greater impact on the environment, such as temperature changes rise, the LED Street light current will increase, the increase in voltage, and the LED Street light current will also increase. Long-term work beyond the rated current will greatly shorten the service life of LED street lamp beads. And LED Street lights constant current is in the temperature and voltage, and other environmental factors change to ensure that its current working value remains unchanged.

2. LED Street light power supply constant current accuracy.

There is an LED Street light power supply on the market with poor constant current accuracies, such as the popular recommended programs on the market and other constant current programs. The error reaches ± 8%, and the constant current error is too large. General requirements in ± 3% on it. According to the 3% design program. Production power supply to be fine-tuned to achieve ± 3% error.

3. LED Street light power supply operating voltage.

The general recommended operating voltage of LED Street lights is 3.0-3.5V. Tested, most of the work at 3.2V, so according to the 3.2V calculation formula is more reasonable. n beads in series with the total voltage = 3.2 * N

4. What is the most appropriate operating current for LED Street light power supply?

For example, the rated operating current of the LED Street light is 350 mA. In some lighting design factories, to the end of the beginning, the design of 350 mA this current work under heat is very serious. After many comparative tests, a design of 320 mA is ideal. Try to reduce heat generation so that more electrical energy is into visible light energy.

5. How wide is the LED Street light power supply board series-parallel connection and wide voltage?

To make the LED Street light power supply work in a relatively wide input voltage range of AC85-265V, it is important to connect the LEDs in series and parallel the light board. Try not to use wide voltage to ensure the reliability of the power supply. As the current power supply is generally a non-isolated step-down constant-current power supply, in the required voltage of 110V, the output voltage should not exceed 70V, and the number of series connection does not exceed 23 strings. The input voltage is 220V when the output voltage can reach 156V. That is to say, the number of series connections does not exceed 45 strings. The number of parallel connections should not be too many. Otherwise, the working current is too large, and the power supply heats up seriously. There is also a wide voltage program, APFC active power compensation is first used L6561/7527 to raise the voltage to 400V, then step down, equivalent to two switching power supplies. This program is used only under certain conditions.

6. Isolated / non-isolated.

A general isolated power supply, such as made of 15W, placed in the LED Street light power tube, its transformer volume is very large and difficult to put in. It mainly depends on the space structure depending on the specific situation. Isolation of the general can only do 15W, more than 15W rarely, and very expensive. Therefore, isolated cost-effective, generally non-isolated account for more mainstream. The volume can be smaller, and the smallest can be high, 8 mm. Non-isolated security measures are well done, and there is no problem. Space allows also can do isolated power supply.

7. LED Street light power supply how to match the lamp beadboard?

Some customers design the lamp board and then find the power supply, finding it difficult to have the right one. Either the current is too large, the voltage is too small, or the current is too small, the voltage is too high, the result is serious heat, low efficiency, or insufficient input voltage range. Choose the best way to connect a series-parallel, and add the same voltage and current on each LED Street light while the effect of the power supply can play the best performance. The best way is to communicate with the power supply manufacturer first, tailored. Or produce your power supply.

8. LED Street lights in series-parallel with PFC power factor.

LED Street light power beads in series of up to 45 strings or less are appropriate. Therefore, the number of the series connection of lamp beads can not be too small to get a relatively large power factor. Otherwise, it will not achieve the best working condition. The number of series connections on the isolated power supply and the number of turns of the secondary winding, the power supply must be done to meet the output power. LED Street light power beads are very sensitive to the AC component. The higher the AC component, the worse the light comfort. Generally, electrolytic capacitors should be used to maintain the voltage and reduce the output voltage of the AC component as much as possible. Non-isolated input high voltage electrolytic capacitor selection is the same as isolated type, output capacitor selection 1UF<6MA. Dimming LED power supply in the output electrolytic capacitor to meet 1UF<0.5MA.

9. LED Street light power supply power efficiency.

Input power minus the output power value, this parameter is particularly important. The greater the value, the lower the efficiency, which means that a large part of the input power is converted into heat emitted; if it is installed in the lamp will produce a very high temperature. Coupled with our LED Street lights, a light efficiency than the heat emitted, it will be superimposed to produce higher temperatures. And the life of all the electronic parts inside our power supply will be shortened with the temperature rise, so efficiency is the most fundamental factor in determining the life of the power supply. The efficiency can not be too low. Otherwise, the heat consumed in the power supply is too large. Non-isolated efficiency is higher than isolated. Generally, more than 80% can be—however, the efficiency of the lamp board with the matching connection method is.

10. LED street lamp power supply heat dissipation.

The heat dissipation program is the main factor the LED Street light power beads in thermal conditions can greatly extend the life of the use. Generally, with aluminum, it is easier to dissipate heat. The LED Street light power beads are attached to the aluminum substrate, and the external tries to expand the heat dissipation area.

These are the knowledge points about LED Street light power technology. If you need more detailed information, welcome to contact us!