According to the power consumption rules of the power grid and the characteristics of the LED driving power supply, the following points shall be considered when selecting and designing the LED driving power supply:

1. High reliability: especially like the driving power supply of LED street lamps, it is installed at high altitude, difficult to maintain and costly.

2. High efficiency: the luminous efficiency of LED decreases with the increase of temperature, so heat dissipation is very important. Especially, the power supply is installed in the lamp

LED is an energy-saving product, with high driving power efficiency and low power consumption. The heat generation in the lamp is small, which is conducive to reducing the temperature rise of the lamp. Delay LED light decay.

3. High power factor: power factor is the requirement of power grid for load. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the low power factor of a single electric appliance with low power has little impact on the power grid, when everyone lights up at night, the similar loads are too concentrated, which will cause serious pollution to the power grid. It is said that in the near future, there may be certain index requirements on power factor for 30-40 watt LED driving power supply.

4. Constant current output power supply mode;

1) Multi channel constant current output, flexible combination, one LED fault, does not affect the work of other LEDs, and the cost is slightly high.

2) Direct constant current power supply, LED series or parallel operation. The cost is a little low, but the flexibility is poor. The failure of one LED affects the operation of other LEDs.

These two forms will coexist for a period of time. The multi-channel constant current output power supply mode will be better in cost and performance. Maybe it will be the mainstream direction in the future.

5. Surge protection: the anti surge capability of LED is relatively poor, especially the anti reverse voltage capability. It is also important to strengthen protection in this regard. Some LED lamps are installed outdoors, such as LED street lamps. Due to the activation of the grid load and the induction of lightning strikes, various surges will invade from the grid system, and some surges will cause led damage. Therefore, the LED driving power supply should have the ability to suppress the invasion of surge and protect the LED from damage.

6. Protection function: in addition to the conventional protection function of the power supply, it is better to add the negative feedback of LED temperature in the constant current output to prevent the LED temperature from being too high.

7. Protection: the lamp is externally installed, the power structure should be waterproof and moisture-proof, and the shell should be sun resistant.

8. The service life of the driving power supply shall match the service life of the LED.

9. It shall meet the requirements of safety regulations and electromagnetic compatibility.