Characteristics of LED driver

Characteristics of LED driver:

(1) High reliability

In particular, the driving power supply of LED street lamps is installed at high altitudes, which is inconvenient to maintain and expensive to maintain.

(2) High efficiency

LED is an energy-saving product, and the efficiency of driving power supply should be high. For the junction where the power supply is installed in the lamp, heat dissipation is very important. The efficiency of the power supply is high, its power consumption is small, the calorific value in the lamp is small, and the temperature rise of the lamp is reduced. It is beneficial to delay the light attenuation of LED.

(3) High power factor

Power factor is the requirement of a power grid for the load. Generally, there are no mandatory indicators for household appliances below 70 watts. Although the power factor of a single electric appliance with small power is lower, it has little impact on the power grid, the use of lighting at night is large, and the similar loads are too concentrated, which will cause serious pollution to the power grid. For 30-40 watt LED driving power supply, it is said that in the near future, there may be certain index requirements for power factors.

(4) Driving mode

Now there are two kinds of: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. In this way, the combination is flexible, one LED failure will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, that is, Zhongke Huibao "The driving mode adopted instead is led series or parallel operation. Its advantage is that the cost is lower, but the flexibility is poor. It also needs to solve the problem that one LED fault does not 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 terms of cost and performance. It may 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 the protection in this regard. Some LED lamps are installed outdoors, such as LED street lamps. Due to the start-up and rejection of power grid load and the induction of lightning stroke, various surges will invade from the power grid system, and some surges will cause led damage. Therefore, the analysis of "Zhongke Huibao" "The driving power supply of the LED should have some deficiencies in surge protection. As for the frequent replacement of power supply and lamps, the LED driving power supply should have the ability to suppress the invasion of surges and protect the LED from damage.

(6) Protection function

In addition to the conventional protection function of the power supply, it is best to add LED temperature negative feedback in the constant current output to prevent the LED temperature from being too high; it shall meet the requirements of safety regulations and electromagnetic compatibility.