What should be considered when selecting LED power supply?

What should be considered when selecting LED power supply?

According to the electricity regulation of the power grid and the characteristics of LED power supply, the following points should be taken into consideration when selecting and designing the LED power supply:

1. High reliability

Especially like LED street lamp drive power supply, installed in high altitude, maintenance is not convenient, the cost of maintenance is also big.

2. Efficiency

LED is an energy-saving product, the efficiency of power supply should be high. The installation of the power supply is very important because LED's luminous efficiency decreases with the increase of LED temperature, the heat dissipation of LED is very important. The efficiency of power supply is high, then its loss power is small so heat in lamps and lanterns is small, reducing the temperature rise of lamps and lanterns. It is advantageous to delay Lumens Depreciation.

3. High power factor

Power factor is the requirement for load of power grid. Generally speaking, electric appliance below 70watt do not have mandatory index. The low power factor of a single appliance with low power has little impact on the power grid, but when in the evening everyone lights up, the same kind of load is too concentrated, producing more serious pollution to the power grid. For 30-40 watts LED power supply, it is said that there may be compulsory index about power factors in the near future.

4. Driving mode

There are two types: one is a constant pressure source for multiple constant current sources, and each constant current source is supplied to each LED. In this way, the combination is flexible. One LED’s failure does not affect the work of other leds, but the cost will be higher. The other is direct current power supply, LED series connection or parallel operation. It has lower cost but poor flexibility, and we need to solve an LED failure without affecting other LED running problems. These two forms coexist for a period of time. Multi-channel constant current output power supply mode can be better in cost and performance. Maybe it will be popular in the future.

5. Surge protection

The ability for LED to surge resistance is poor, especially anti-reverse voltage. It is necessary to strengthen the protection of this aspect. Some LED lights are installed outdoors, such as LED street lamps. Due to the load of the power grid and the lightning strike, the power grid system will be invaded by all kinds of waves, and some surge may cause damage to the LED. Therefore, the LED power supply should have the ability to suppress the surge and protect the LED from being damaged.

6. Protection function

In addition, it is better to increase the negative feedback of LED temperature in the constant current output to prevent the LED from being too hot.

7. Protection

If the lamp is installed outdoor, the power structure should be waterproof, moisture-proof and the shell should be sun-proof.

8. The life of the power supply should be compatible with the life of the LED.

9. Comply with the requirements for safety and electromagnetic compatibility.