1. LED street lamp power supply must be constant current
The characteristics of LED street light's lighting materials determine that it is affected by the environment. For example, when the temperature changes, the current of LED will increase; in addition, when the voltage increases, the current of LED will also increase. If the long-term over rated current and work, it will greatly shorten the service life of LED lamp beads. LED constant current is to ensure that the current value of its work is constant when the environmental factors such as temperature and voltage change.

2. Constant current accuracy of LED street lamp power supply
The constant current accuracy of some power sources on the market is poor, the possible error is ± 8%, and the constant current error is too large. The general requirement is ± 3%. According to 3% design plan. The production power supply needs to be adjusted to achieve ± 3% error.

3. Working voltage of LED street lamp power supply
Generally, the recommended working voltage of LED is 3.0-3.5v. After testing, most of them work at 3.2V, so the calculation formula of 3.2V is reasonable. Total voltage of N lamp beads in series = 3.2 * n.

4. What is the most suitable working current of LED street lamp power supply
For example, the rated working current of LED is 350 Ma, which is used up in some factories at the very beginning. In fact, the working heat is very serious under this current. After many comparative tests, it is ideal to design it as 320 ma. Reduce the heat as much as possible, and make more electric energy into visible light energy.

5. How wide is the series parallel connection and wide voltage of LED street lamp power board?
In order to make the LED street lamp power supply work in a wide range of input voltage AC85-265V, the LED series parallel connection mode of the lamp board is very important. Try not to use wide voltage. It can be divided into AC220V and AC110V, so as to ensure the reliability of power supply. As the current power supply is generally non isolated step-down constant current power supply, when the required voltage is 110V, the output voltage shall not exceed 70V, and the number of series connection shall not exceed 23. When the input voltage is 220V, the output voltage can reach 156v. That is to say, the serial number shall not exceed 45. The number of parallel connection should not be too much, otherwise the working current is too large and the power supply is heated seriously. There is also a wide voltage scheme, APFC active power compensation is to use L6561 / 7527 to raise the voltage to 400V, and then reduce the voltage, equivalent to two switching power supplies. This plan is only used under certain conditions.

6. Isolated / non isolated
Generally, if the isolated power supply is made of 15W, it is placed in the LED street lamp power pipe, and the transformer is very large, so it is difficult to put it in. It mainly depends on the specific situation of the space structure. Generally, only 15W can be achieved for the isolated ones, and few are more than 15W, and the price is very expensive. Therefore, the cost performance of isolation is not high. Generally, non isolation accounts for a large proportion of the mainstream. The volume can be smaller, and the minimum height can be 8mm. In fact, there is no problem when the non isolation safety measures are done. The space allowed can also be used for isolated power supply.

7. How can the LED street lamp power supply match with the lamp bead board?
In fact, choosing the best series parallel connection mode, the voltage and current applied to each LED are the same, while the effect of power supply can play the best performance. The best way is to communicate with the power supply manufacturer first and make it to measure. Or self-produced power supply.

8. LED street lamp power efficiency
Input power minus output power This parameter is particularly important. The higher the value, the lower the efficiency, which means that a large part of the input power will be converted into heat emission; if it is installed in the lamp, it will produce a high temperature, plus a light efficiency ratio of our LED, it will produce a higher temperature. And the life of all electronic parts in our power supply will increase with the temperature And shorten. So efficiency is the most fundamental factor to determine the life of the power supply. Efficiency cannot be too low, or the heat consumed in the power supply is too large. The efficiency of the non isolated type is higher than that of the isolated type, generally more than 80%. However, the efficiency is related to the matching connection of the lamp panel.

9. Heat dissipation of LED street light source
The main factor of the heat dissipation scheme is that the LED street lamp beads can greatly extend the service life under the condition of not overheating. That is to say, the power bead of LED street lamp is pasted on the aluminum substrate, and the external heat dissipation area is expanded as much as possible.

10. LED street lamp power dissipation
The main factor of heat dissipation is that the LED street lamp power supply beads can greatly extend the service life under the condition of not overheating. Generally, aluminum alloy radiator is used, which is easier to heat dissipation. That is to say, the power bead of LED street lamp is pasted on the aluminum substrate, and the external heat dissipation area is expanded as much as possible.
The above ten items give us a detailed analysis of the key points for attention of LED street lamp. Reasonable use will improve the service life of LED street lamp and reduce the production cost. I believe that no matter who is interested in it.