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LED driver features​

Date:2016-05-06

According to grid electricity rules and led driving characteristics of the power requirements. In the selection and design of LED drive power to consider the following several points: 


1. High reliability especially as the driving power for LED street lamp, installed in the high altitude, inconvenient maintenance, maintenance cost is also. 


2 high efficiency LED is energy-saving products, drive power efficiency is high. For the power supply installation, LED drive power supply in the lamp structure, 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 efficiency of the power supply of high power consumption, it is small, in the heat of the lamp 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 power grid to load. Generally less than 70 watts of electrical appliances, there is no mandatory indicators. 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 LED drive power, it is said that in the near future, there may be some indicators of the power factor requirements.


 4 driving mode has two kinds: one is a constant pressure source for multiple constant current source, each constant current source to each road LED alone. This way, the combination of flexible, all the way LED fault, does not affect the work of other LED, but the cost will be slightly higher. The other is direct current power supply, LED series or parallel operation. It has the advantage of low cost, but poor flexibility, but also to solve a LED failure, does not affect the operation of other LED issues. These two forms coexist in a period of time. Multi way constant current output power supply, in terms of cost and performance will be better. May be the future of the mainstream. 


5 surge protection LED anti surge capacity is relatively poor, especially the anti reverse voltage capability. It is also important to strengthen the protection of this area. Some LED lights are installed outdoors, such as LED street lamps. Due to the load of the power grid and lightning induction, from the grid system will invade a variety of surge, some surge will cause damage to LED. Therefore, LED drive power supply to suppress the surge of intrusion, the protection of the ability of LED is not damaged.


 6 protection function in addition to conventional protection function, it is best to increase the LED temperature in the constant current output negative feedback to prevent the LED temperature is too high. 


7 protection lamp installation type, power structure should be waterproof, moisture-proof, shell to light. 


8 the life of the driving power supply is suitable for the life of LED.


 9 to meet the requirements of safety and electromagnetic compatibility. With the increasing application of LED, the performance of LED drive power supply will be more and more suitable for LED.

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