Characteristics of LED driving power supply

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Characteristics of LED driving power supply

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

1. High reliability is especially like the driving power supply of LED street lamp. It is installed at a high altitude and has waterproof aluminum shell driving power supply. If the quality is good, it is not easy to be damaged and the maintenance times are reduced.

2. High efficiency LED is an energy-saving product with high efficiency of driving power supply. For power installation

The structure inside the lamp 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 is high, its power consumption is small, and the heat generated in the lamp is small, which also reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LED.

3. High power factor power factor is the requirement of power grid to load. Generally, there is no mandatory index for electrical appliances below 70W. Although the low power factor of single electric appliance with small power has little influence on the power grid, when everyone lights at night, the same kind of load is too concentrated, which will cause serious pollution to the power grid. It is said that in the near future, the power factor of 30-40 watt LED driving power supply may have certain requirements.

4. There are two driving modes: one is a constant voltage source for multiple constant current sources, each constant current source for each LED. In this way, the combination is flexible, one LED failure does not affect the work of other LEDs, 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 poor flexibility. It also needs to solve the problem that one LED fault will affect the operation of other LEDs. These two forms coexist for a period of time. The multi-channel constant current output power supply mode will be better in cost and performance. Maybe it's the mainstream direction in the future.

5. The anti surge capability of surge protection LED is relatively poor, especially the anti reverse voltage capability. It is also important to strengthen protection in this regard. Some LED lights are installed outdoors, such as LED street lights. Due to the load swing and lightning induction of the power grid, various surges will be intruded from the power grid system, some of which 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. In addition to the normal protection function, it is better to add LED temperature negative feedback in the constant current output to prevent the LED temperature from being too high.

7. In terms of protection, the lamp shall be installed outside. The power structure shall be waterproof and moisture-proof, and the shell shall be sun resistant.

8. The life of the driving power supply shall be suitable for the life of the LED.

9. Meet the requirements of safety regulations and electromagnetic compatibility.

With the increasingly wide application of LED, the performance of LED driving power supply will be more and more suitable for the requirements of LED.