Ten points for attention of LED street lights

Ten points for attention of LED street lights

　　 The large number of applications of LED street lamps in society at this moment have played a decisive role in the progress of lighting projects, especially the energy-saving and low-carbon two-wind elegance of LED street lamps has made important contributions to society. Let’s talk about daily 10 things you should pay attention to when using LED street lights.



　　 1. The power supply of LED street lamp must be constant current



　　 The characteristics of the lighting material of the LED street lamp determine that it is affected by the environment. For example, as the temperature changes, the current of the LED will increase; in addition, the increase of the voltage will increase the current of the LED. If the working current exceeds the rated current for a long time, it will greatly shorten the service life of the LED lamp beads. LED constant current is to ensure that the current value of its work remains unchanged when environmental factors such as temperature and voltage change.



　　2, LED street lamp power supply constant current accuracy



　　 The constant current accuracy of some power supplies on the market is poor, and the error may reach ±8%, and the constant current error is too large. The general requirement is within ±3%. According to the 3% design plan. The production power supply needs to be fine-tuned to achieve ±3% error.



　　3. Working voltage of LED street lamp power supply



　　 The recommended working voltage of general LEDs is 3.0-3.5V. After testing, most of them work at 3.2V, so the calculation formula of 3.2V is reasonable. The total voltage of N lamp beads in seriesu003d3.2*N



　　4. What is the most suitable working current of the LED street light power supply?



　　 For example, the rated working current of the LED is 350 mA. Some workshops use it up at the beginning. The design is 350 mA. In fact, the fever is very serious when working at this current. After many comparison tests, the design is 320 mA. Ambitious. Minimize the fever, so that more electrical energy can be turned into visible light energy.



　　 5. How wide is the series-parallel connection and wide voltage of the LED street lamp power supply board?



　　 In order to make the LED street lamp power supply work in the input voltage range of AC85-265V, the series and parallel mode of the LED panel is very important. Try not to use a wide voltage, which can be divided into AC220V and AC110V as much as possible, so as to ensure the reliability of the power supply. Since the current power supply is generally a non-isolated step-down constant current power supply, when the required voltage is 110V, the output voltage should not exceed 70V, and the number of series connections should not exceed 23 strings. When the input voltage is 220V, the output voltage can reach 156V. In other words, the number of series does not exceed 45 series. Do not connect too many in parallel, otherwise the working current will be too large and the power supply will have a serious fever. There is also a wide voltage solution. APFC active power compensation is to use L6561/7527 to increase the voltage to 400V first, and then step down, which is equivalent to two switching power supplies. This program is only used under certain conditions.





　　 6. Isolation/non-isolation



　　 Generally, the isolated power supply is made into 15W and placed in the LED street lamp power tube. The transformer is very large and difficult to put in. The space layout depends mainly on the specific environment. Generally, the isolation can only be 15W, and there are few more than 15W, and the price is very expensive. Therefore, Jiangsu Naite Lighting Electric Co., Ltd. is a manufacturer engaged in the production and design of solar street lamps and high-pole lamps. With 20 years of experience in the production of solar street lamps, it has created the most professional solar street lamp manufacturer. Contact number: 13805257308. , Isolation is not cost-effective. Generally, long and short isolation dominate the mainstream. The volume can be made smaller, and the minimum can be as high as 8 mm. In fact, the non-isolated security method is done, and there is no problem. Space permitting can also be used as an isolated power supply.



　　7. How can the LED street lamp power supply match the lamp bead board?



　　 In fact, choose the best series-parallel connection method. The voltage and current applied to each LED are the same, but the power supply effect can demonstrate the best performance. The best way is to communicate with the power supply manufacturer first, and tailor it. Or produce their own power supply.



　　 8. LED street lamp power efficiency



　　 Input power minus output power value. This parameter is particularly important. The larger the value, the lower the efficiency, which means that a large part of the input power is converted into heat and is emitted; if it is installed in the lamp, a Very high temperature, coupled with a luminous efficiency ratio of our LED, will generate a higher temperature. And the life of all electronic parts in our power supply will be shortened with the rise of temperature. So efficiency It is the most fundamental factor that determines the life of the power supply. The efficiency cannot be too low, otherwise the heat loss on the power supply is too large. The efficiency of the non-isolated type is higher than that of the isolated type, generally above 80%. However, the efficiency is related to the matching connection method of the light board.



　　9, LED street light source heat dissipation



　　The main factor of the heat dissipation plan is that the LED street lamp beads can greatly prolong their life when used under no external heat conditions. Generally, aluminum alloy is used, which is easier to dissipate heat. That is, the LED street lamp power beads are attached to the aluminum substrate, and the external heat dissipation area is maximized.



　　10, LED street lamp power supply cooling



　　 The main factor for heat dissipation is that the LED street lamp power beads can greatly prolong their life when used under no external heat conditions. Generally, aluminum alloy radiators are used, which is easier to dissipate heat. That is, the LED street lamp power beads are attached to the aluminum substrate, and the external heat dissipation area is maximized.



　　 The above ten matters have analyzed the key points of LED street lights in detail. Reasonable use will increase the service life of LED street lights and reduce production costs. I believe that no matter who the city is interested in.