Characteristics of LED drive power supply？
(1) High reliability
Especially like LED street lamp driving power, installed in the high altitude, maintenance is not convenient, maintenance costs are large.
(2) Efficiency
LED is energy saving products, driving power efficiency should be high. For the power supply installed in the luminaire junction heat dissipation is very important. The efficiency of the power supply is high, the power consumption is small, the heat in the lamp is small, and the temperature rise of the lamp is reduced. It is beneficial to delay the light decay of LED.
(3) High power factor
The power factor is the load requirement of the grid. General household appliances below 70 watts, there is no mandatory indicator. Although the power factor of a single appliance with small power is low, it has little impact on the power grid, but the use of lighting at night is large, and the same load is too concentrated, which will cause serious pollution to the power grid. For 30 W ~40 W LED drive power supply, it is said that in the near future, there may be certain indicators on the power factor.
(4) Driving mode
Now there are two kinds of common: one is a constant voltage source for multiple constant current sources, each constant current source separately to each LED power. This way, the combination is flexible, one 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, which is the driving mode of "Zhongke Huibao", LED series or parallel operation. Its advantages are a little lower cost, but poor flexibility, but also to solve a LED failure, do not affect the operation of other LED problems. These two forms, for a period of time, coexist. Multiple constant current output power supply mode, in terms of cost and performance will be better. Maybe the mainstream direction in the future.
(5) Surge protection
LED anti-surge ability is relatively poor, especially anti-reverse voltage ability. It is also important to strengthen protection in this area. Some LED lights are installed outdoors, such as LED street lamps. Due to the load of the grid and the induction of lightning strikes, from the grid system will invade a variety of surges, some surges will lead to LED damage. Therefore, the analysis of "Zhongke Huibao" driving power should have a certain lack of surge protection, and as for the frequent replacement of power and lamps, LED driving power should have the ability to inhibit the invasion of surge, protect LED from being damaged.
(6) Protection function
In addition to the conventional protection function of the power supply, it is suggested to add LED temperature negative feedback in the constant current output to prevent LED temperature from being too high; To meet the requirements of safety and electromagnetic compatibility.