LED lamp performance requirements:
1 high reliability, especially like the LED street lamp driver power, installed in the high altitude, maintenance is not convenient, the cost of maintenance is also large.
2 high efficiency LED is an energy saving product, the efficiency of driving power supply is high. For power installation in the light of the structure, is particularly important. Because the luminous efficiency of LED decreases with the increase of LED temperature, the cooling of LED is very important. The efficiency of the power supply of high power consumption, it is small in the lamp, the heat is small, it reduces the temperature rise of lamps. Favorable to delay the LED attenuation.
3 high power factor power factor is the requirement of the power grid to the load. General 70 watts of electrical appliances, there is no mandatory index. Although power is not a single electrical power factor low point on the grid has little effect, but all night lighting similar load is too concentrated, will cause serious pollution to the power grid. For 30 watts ~40 watts of LED drive power, it is said that the near future, there may be some of the power factor requirements.
4 there are two driving modes: one is a constant source of constant current source, each constant current source to each LED power supply. In this way, the combination of flexible, a LED failure, does not affect the work of other LED, but the cost will be slightly higher. The other is direct constant current power supply, LED series or parallel operation. It has the advantage of low cost, but the flexibility is poor, but also to solve a LED fault, does not affect other LED operation. These two forms, in a period of coexistence. Multi channel constant current output power supply, in terms of cost and performance will be better. May be the future mainstream direction.
5 the ability to protect LED against surge is relatively poor, especially for anti reverse voltage. Strengthen the protection of this area is also very important. Some LED lights are installed outdoors, such as LED street lamps. Due to the load of the power grid and the induction of lightning strikes, from the power grid system will invade a variety of surge, some of the surge will lead to LED damage. Therefore, the LED drive power supply should have the ability to suppress the surge and protect the LED from damage.
6 in addition to the protection of the function of the conventional protection function, it is best to increase the LED temperature in the constant current output negative feedback, to prevent LED temperature is too high.
7 protection lamp installation type, power supply structure should be waterproof, moisture-proof, shell to light.
8 the service life of the drive power supply should be matched with the life of LED.
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