Time of issue:

2024-03-28

According to the electricity consumption rules of the power grid and the characteristic requirements of LED drive power supplies, the following points should be considered when selecting and designing LED drive power supplies: 1. High reliability, especially like the driving power supply for LED street lights, installed at high altitude, with a waterproof aluminum shell driving power supply. If the quality is good, it is not easy to break and reduces the number of repairs. 2. High efficiency LEDs are energy-saving products, and the efficiency of the driving power supply should be high. For the structure where the power supply is installed inside the lamp, it is particularly important. Because the luminous efficiency of LED decreases with the increase of LED temperature, the heat dissipation of LED is very important. The power supply has high efficiency, low power consumption, and generates less heat inside the lamp, which reduces the temperature rise of the lamp. It is beneficial for delaying the light decay of LEDs. 3. High power factor is a requirement of the power grid for loads. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of individual appliances with low power has little impact on the power grid, lighting up at night and concentrating similar loads can cause serious pollution to the power grid. For LED driver power supplies ranging from 30 watts to 40 watts, it is said that there may be certain requirements for power factor in the near future. There are two driving modes available: one is a constant voltage source that supplies multiple constant current sources, with each constant current source supplying separate power to each LED. This method is flexible in combination, and if one LED fails, it will not affect the operation of other LEDs, but the cost will be slightly higher. Another method is direct constant current power supply, with LED series or parallel operation. Its advantage is that it has a lower cost, but poor flexibility, and it also needs to solve the problem of one LED malfunction, which will affect the operation of other LEDs. These two forms coexist for a period of time. The multi-channel constant current output power supply method will have better cost and performance. Perhaps it is the mainstream direction in the future. 5. The ability of LED surge protection to withstand surges is relatively poor, especially in terms of resistance to reverse voltage. Strengthening protection in this area is also important. Some LED lights are installed outdoors, such as LED street lights. Due to the load shedding of the power grid and the induction of lightning strikes, various surges may invade the power grid system, some of which can cause damage to the LED. Therefore, the LED driver power supply should have the ability to suppress surge intrusion and protect the LED from damage. 6. Protection function: In addition to conventional protection functions, it is best to add LED temperature negative feedback in the constant current output of the power supply to prevent excessive LED temperature. 7. In terms of protection, the external installation type of the lamp should be waterproof and moisture-proof, and the outer shell should be sun resistant. 8. The lifespan of the driver power supply should match the lifespan of the LED. 9. It must comply with safety regulations and electromagnetic compatibility requirements. With the increasing application of LED, the performance of LED driver power supply will become more and more suitable for the needs of LED

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