Detailed explanations of three commonly used LED driver power supplies

What is LED drive power

The LED drive Power Supply is a power converter that converts the power supply into a specific voltage and current to drive the LED light. Under normal circumstances: the input of the LED drive power includes high voltage power frequency AC (ie, mains power), low voltage DC, high voltage DC, and low voltage high. Frequency communication (such as the output of electronic transformers) etc.

The output of the led driver is mostly a constant current source that changes the voltage as the LED forward voltage drop changes.

1. The high reliability is very similar to the driving power of LED street lights. It is installed at high altitude and has a waterproof aluminum shell drive power supply. If it is of good quality, it is not easy to be damaged and the number of maintenance is reduced.

2. High-efficiency LEDs are energy-efficient products that drive the power supply more efficiently. The structure of the power supply installed in the lamp is particularly important. Because the LED's luminous efficiency decreases as the LED temperature increases, the heat dissipation of the LED is very important. The efficiency of the power supply is high, its power consumption is small, and the heat generation in the lamp is small, which also reduces the temperature rise of the lamp. It is beneficial to delay the decay of the LED.

3. High power factor power factor is the grid's load requirements. Electrical appliances below 70 watts are generally not mandatory. Although the power factor of a single appliance with low power has a little lower impact on the power grid, at night, everyone lights up and the similar load is too concentrated, causing serious pollution to the power grid. For a 30-watt to 40-watt LED Driver, it is said that in the near future, there may be certain indicators of power factor.

4. There are two kinds of driving methods now: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED individually. This way, the combination of flexible, all the way LED failure, does not affect the work of other LEDs, but the cost will be slightly higher. The other is a direct constant current supply with LEDs running in series or in parallel. Its advantage is that the cost is lower, but the flexibility is poor, but also to solve a certain LED failure, does not affect the operation of other LED. Both forms coexist for a period of time. Multiple constant current output power supply methods will be better in terms of cost and performance. It may be the main direction of the future.

5. Surge protection The ability of a LED to withstand surges is poor, especially against reverse voltage. It is also important to strengthen this protection. Some LED lights are installed outdoors, such as LED street lights. Due to the start of the grid load and the induction of lightning, various surges can be invaded from the grid system, and some surges can lead to LED damage. Therefore, the LED drive power must have the ability to suppress surges and protect the LED from damage.

6. In addition to the conventional protection functions, the protection function power supply is better to increase the 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 is mounted externally, and the power supply structure should be waterproof and moisture-proof, and the outer shell should be resistant to light.

8. The life of the drive power supply must match the life of the LED.

9. To meet safety and electromagnetic compatibility requirements.