The lighting project of LED lighting industry is not only affected by the global environment
2020年1月9日Ten unknown secrets of LED street lights Foreword: The lighting project of LED lighting industry is not only affected by the global environment, but also its industry specificity. The LED street light power supply is precisely the top priority of the current LED development. Regarding the related design of LED technology, there have been multiple schemes and common design methods. Let’s find out. 1. Why does the LED street light power supply need constant current? The characteristics of the LED lighting data determine that it is greatly affected by the environment. For example, the temperature changes, the current of the LED will increase, the voltage will increase, and the current of the LED will also increase. Temporarily surpassing the task of extra current will greatly extend the operating life of the LED lamp beads.
The constant current of LED is to ensure that its task current value does not change when the environmental factors such as temperature and voltage change. 2. Constant current accuracy of LED street light power supply Some constant current accuracy of the power supply on the market is poor. Constant current solutions such as popular referral schemes in the market, the error reaches ± 8%, and the constant current error is too large. Usually need to be within ± 3%. According to the 3% design plan. Consumer power needs to stop trimming to reach ± 3% error. 3. Task voltage of LED street light power supply The recommended Ip65 led integrated lamp https://www.ledwaterprooflighting.com/product/ip65-t5-t8-tri-proof-light/ task voltage of LED is usually 3.0-3.5V. After testing, most of the tasks are 3.2V, so the 3.2V calculation formula is more reasonable. The total voltage of N lamp beads connected in series = 3.2 * N 4. The task current of the LED street light power supply is a lot, which is suitable. For example, the additional task current of the LED is 350 mA, and some factories run out of it at the beginning, and the design is 350 mA. In practice, the task is very hot under this current. After repeated comparison experiments, the design of 320 mA is ideal. Try to increase the amount of heat, so that more electricity can be turned into visible light. 5. How wide is the series and parallel and wide voltage of the LED street light power board? It is necessary to make the LED street light power supply task in a wider range of output voltage AC85-265V.
The LED series and parallel mode of the light board is very important. Try not to operate a wide voltage, you can share AC220V, AC110V can be classified as much as possible, so as to ensure the reliability of the power supply. Because the current power supply is usually a non-isolated constant current power supply, when the required voltage is 110V, the input voltage does not need to exceed 70V, and the number of series does not exceed 23 strings. When the output voltage is 220V, the input voltage can reach 156V. In other words, the number of series does not exceed 45 strings. The number of parallel connections does not need to be too much, otherwise the task current is too large, and the power supply is severely heated. There is also a wide voltage scheme. APFC active power compensation is to first increase the voltage to 400V with L6561 ($ 0.4083) / 7527, and then lower it, which is equivalent to two switching power supplies. This solution is only used under certain conditions. 6. Isolation / non-isolation If the isolated power supply is usually made of 15W and placed in the LED street light power tube, its transformer is very large and difficult to release. Secondly, the space structure depends on the detailed conditions. The isolation can usually only achieve 15W, rarely exceeding 15W, and the price is very expensive. Therefore, the cost-effectiveness of isolation is not high. Usually, non-isolation has more mainstream, the volume can be made smaller, and the height can be as small as 8 millimeters. In practice, non-isolated security measures are in place. . Space permitting can also be used as isolated power. 7. How do I need the power supply of LED street lamp power supply to match with the lamp beads board? Some customers design the lamp board first, then find the power source, find it is difficult to have a suitable power source, do they need too much current, and the voltage is too low (such as 7X1WI) 350mA, or V
The constant current of LED is to ensure that its task current value does not change when the environmental factors such as temperature and voltage change. 2. Constant current accuracy of LED street light power supply Some constant current accuracy of the power supply on the market is poor. Constant current solutions such as popular referral schemes in the market, the error reaches ± 8%, and the constant current error is too large. Usually need to be within ± 3%. According to the 3% design plan. Consumer power needs to stop trimming to reach ± 3% error. 3. Task voltage of LED street light power supply The recommended Ip65 led integrated lamp https://www.ledwaterprooflighting.com/product/ip65-t5-t8-tri-proof-light/ task voltage of LED is usually 3.0-3.5V. After testing, most of the tasks are 3.2V, so the 3.2V calculation formula is more reasonable. The total voltage of N lamp beads connected in series = 3.2 * N 4. The task current of the LED street light power supply is a lot, which is suitable. For example, the additional task current of the LED is 350 mA, and some factories run out of it at the beginning, and the design is 350 mA. In practice, the task is very hot under this current. After repeated comparison experiments, the design of 320 mA is ideal. Try to increase the amount of heat, so that more electricity can be turned into visible light. 5. How wide is the series and parallel and wide voltage of the LED street light power board? It is necessary to make the LED street light power supply task in a wider range of output voltage AC85-265V.
The LED series and parallel mode of the light board is very important. Try not to operate a wide voltage, you can share AC220V, AC110V can be classified as much as possible, so as to ensure the reliability of the power supply. Because the current power supply is usually a non-isolated constant current power supply, when the required voltage is 110V, the input voltage does not need to exceed 70V, and the number of series does not exceed 23 strings. When the output voltage is 220V, the input voltage can reach 156V. In other words, the number of series does not exceed 45 strings. The number of parallel connections does not need to be too much, otherwise the task current is too large, and the power supply is severely heated. There is also a wide voltage scheme. APFC active power compensation is to first increase the voltage to 400V with L6561 ($ 0.4083) / 7527, and then lower it, which is equivalent to two switching power supplies. This solution is only used under certain conditions. 6. Isolation / non-isolation If the isolated power supply is usually made of 15W and placed in the LED street light power tube, its transformer is very large and difficult to release. Secondly, the space structure depends on the detailed conditions. The isolation can usually only achieve 15W, rarely exceeding 15W, and the price is very expensive. Therefore, the cost-effectiveness of isolation is not high. Usually, non-isolation has more mainstream, the volume can be made smaller, and the height can be as small as 8 millimeters. In practice, non-isolated security measures are in place. . Space permitting can also be used as isolated power. 7. How do I need the power supply of LED street lamp power supply to match with the lamp beads board? Some customers design the lamp board first, then find the power source, find it is difficult to have a suitable power source, do they need too much current, and the voltage is too low (such as 7X1WI) 350mA, or V
