The electricity grid and rules required drive power LED characteristics, design and in the choice of LED drive power to take into account the following nine performance characteristics requirements:
1. High reliability, especially like the driving power supply of LED street lamps, installed at high altitude, inconvenient to maintain, and costly for maintenance.
2, high efficiency, LED is energy-saving products, the efficiency of driving power supply is high. It is especially important for structures where the power supply is installed in the luminaire. Since the luminous efficiency of the LED decreases as the temperature of the LED increases, the heat dissipation of the LED is very important. The power supply has high efficiency, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LEDs.
3, high power factor, power factor is the grid's load requirements. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of a single power consumer with low power has little effect on the power grid, at night, everyone lights up, and the similar load is too concentrated, which will cause serious pollution to the power grid. For 30 watts to 40 watts of LED driver power, it is said that in the near future, there may be certain indicators for power factors.
4, the driving method, there are two types of traffic: one is a constant voltage source for multiple constant current sources, each constant current source separately supplies power to each LED. In this way, the combination is flexible, and all the LED faults do not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current supply, with LEDs running in series or in parallel. Its advantage is that the cost is lower, but the flexibility is poor, and it is necessary to solve a certain LED failure without affecting the operation of other LEDs. These two forms coexist for a while. Multi-channel constant current output power supply mode will be better in terms of cost and performance. Perhaps it is the mainstream direction in the future.
5, surge protection, LED anti-surge ability is relatively poor, especially anti-reverse voltage capability. It is also important to strengthen protection in this area. Some LED lights are installed outdoors, such as LED street lights. Due to the start of the grid load and the induction of lightning strikes, various surges will be invaded from the grid system, and some surges will cause LED damage. Therefore, the LED driver power supply must have the ability to suppress the intrusion of surges and protect the LEDs from damage.
6, protection function, power supply In addition to the conventional protection function, it is best to increase the LED temperature negative feedback in the constant current output to prevent the LED temperature from being too high.
7. In terms of protection, the lamp is installed outside, the power supply structure should be waterproof and moisture-proof, and the outer casing should be light-resistant.
8. The life of the drive power supply should be compatible with the life of the LED.
9, to meet the requirements of safety and electromagnetic compatibility.
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