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   The waterproof switching power supply must have certain requirements for its insulation and working temperature. The working temperature of the led waterproof switching power supply is generally -40-80℃ (the outer surface temperature of the casing), the storage temperature is -40-85℃, the working humidity is 10-90% relative humidity, and the average life is the mean time between failures (MTBF) 50,000 hours, and UL60950, EN6134 is required for safety specification certification.

     The features are also very remarkable:
1. The first is high reliability: especially the driving power supply of LED street lamps is at high altitude, which leads to the inconvenience of maintenance, which is more expensive than the cost;
2. High efficiency: LED is an energy-saving product, and the efficiency of the driving power supply is high. Then for the power supply, the structure placed in the LED lamp is very important. Because the luminous efficiency of the LED decreases with the increase of the LED temperature, the heat dissipation of the LED is particularly important. However, when the efficiency of the power supply is high, the power loss of the power supply is small, and the heat generation in the LED lamp is also small, so the temperature of the lamp is reduced, which is beneficial to delaying the light decay of the LED;
3. High power factor: Power factor is the requirement of the grid for the load. Generally, there are no mandatory indicators for electrical appliances below 70 watts.
4. Driving mode: It has two types: the first is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. Its advantage is that the combination is flexible, and the failure of one LED will not affect the normal operation of other LEDs, and the cost will be higher. The first is direct constant current power supply, with LEDs running in series or parallel. But the obvious disadvantage is that the flexibility is poor, and the advantage is that the cost is relatively lower.
These two forms coexist for a period of time. The multi-channel constant current output power supply method will be better in terms of cost and performance. Maybe this will be the mainstream direction in the future;
5. Surge protection function: The ability of LED to resist surge is relatively poor, especially the ability to resist reverse voltage. So we need to strengthen this protection. For example, for LED lamps installed outdoors, due to the start of the grid load and the induction of lightning strikes, various surges will invade from the grid system, and some surges will cause damage to the LED. Therefore, the LED driving power supply must have the ability to suppress the intrusion of the surge and protect the LED from being damaged;
6. Protection function: In addition to the conventional protection function of the power supply, it is better to increase the negative feedback of the LED temperature in the constant current output to prevent the LED temperature from being too high;
7. In terms of protection: the lamp is installed outside, the power supply structure should be waterproof and moisture-proof, and the shell should be resistant to sunlight;
8. The life of the driving power supply should be matched with the life of the LED;
9. To meet the requirements of safety regulations and electromagnetic compatibility;