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What are the factors to consider when selecting and designing LED driver
- Sep 26, 2017 -

What are the factors to consider when selecting and designing LEDs to drive power?

LED driving power supply is to convert the power supply to a specific voltage and current to drive the LED light-emitting voltage converters, usually: the input of LED power supply includes high voltage ac (ie mains), low-voltage DC, high-voltage DC, low-voltage high-frequency communication (such as the output of electronic transformers). The output of LED drive power supply is the constant current source which can change the voltage with the positive pressure drop value of the LED. According to the power grid rules and the characteristics of LED power supply requirements, in the selection and design of LED driving power to take into account the following points:

1. High reliability: Especially like LED street lamp driving power supply, installed in the high-altitude, maintenance inconvenient, maintenance cost is also big.

2. High efficiency: LED is energy-saving products, the efficiency of driving power is high. The structure of the power supply installed in the luminaire is particularly important. 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 requirement of power grid to load. General 70 Watts below the power of the device, there is no mandatory indicators. Although the power of small single use of electrical power factor is little impact on the power grid, but at night, the same load is too concentrated, will have a serious pollution of the 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. Drive mode: There are two kinds of current: one is a constant voltage source for a number of constant current source, each constant current source alone to each led power supply. This method, the combination is very flexible, all the way led failure, do not affect other led work, but the cost will be slightly 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: Led surge resistance is relatively poor, especially the ability 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. Protection function: The 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. Protective lamps outside the installation type, the 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