LED Performance Requirements
1. High reliability, especially like LED street lamp driving power supply, installed in the high-altitude, maintenance inconvenient, maintenance costs are also large.
2. High efficiency LED is energy-saving products, the efficiency of driving power is higher. Especially important is the structure of the power supply installed in the luminaire. Because the LED's luminous efficiency decreases with the increase of LED temperature, so the cooling of LED is very important. The efficiency of the power supply is high, its attrition power is small, the calorific value in the lamp is small, also reduces the lamp temperature rise. It is advantageous to delay the LED's light failure.
3. High power factor power factor is the demand of power grid to load. General 70 Watts below the power of the device, there is no mandatory indicators. Although the power factor of a single electrical appliance is low, the effect on the power grid is small, but at night everyone lights up and the same load is too concentrated, which will cause more serious pollution to the power grid. for 30 Watts ~ Watts LED Drive power, it is said that in the near future, may have a certain degree of power factor requirements.
4. There are two types of driving mode: one is a constant voltage source for a number of constant current source, each constant current source alone to each led power supply. This way, the combination of flexible, led failure, do not affect the work of other LEDs, but the cost will be a little higher. The other is direct constant current power supply, led in series or parallel operation. It has the advantage of low cost, but less flexibility, but also to solve an LED failure, does not affect other led operation problems. These two forms coexist in a period of time. Multi-channel constant current output power supply mode, in the cost and performance will be better. Perhaps the main direction in the future.
5. Surge protection is a relatively poor ability to surge resistance, especially to reverse voltage. It is also important to strengthen protection in this area. Some LED lights are installed outdoors, such as LED street lamps. Due to the power grid load and lightning induction, from the grid system will invade a variety of surges, some surges will cause damage to the LED. Therefore, the LED power supply to inhibit the intrusion of surges, to protect the ability of the LED is not damaged.
6. The protection function power supply in addition to the regular protection function, it is best to increase the LED temperature negative feedback in the constant current output to prevent the LED temperature too high.
7. Protection of the external installation of lamps, power supply structure to waterproof, moisture-proof, the shell to withstand sun.
8. The life of the driving power supply should be matched with the life of the LED.
9. To meet the requirements of safety and electromagnetic compatibility.
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