How to cleverly design LED waterproof switch power supply?

Since we call it a waterproof switching power supply, it must have certain requirements for its insulation and operating temperature. Led waterproof switching power supply operating temperature is generally -40 -80 ° C (outer surface temperature), storage temperature is -40 -85 ° C, working humidity is 10-90% relative humidity, average life is the average time between failures (MTBF) 50,000 hours, and the safety specification certification needs to comply with UL60950, EN6134.

Above we said the requirements of the LED waterproof switch power supply for the working environment. At the same time its characteristics are also very significant:

1. The first is high reliability: especially the driving power of LED street lights, which are all at high altitude, which leads to inconvenience of maintenance and is relatively more expensive;

2. High efficiency: LED is an energy-saving product, and the efficiency of driving power supply is high. Then for the power supply, the structure placed in the led luminaire is very important. Since the luminous efficiency of the LED decreases as the temperature of the LED increases, 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 lowered, which is advantageous for delaying the light decay of the LED;

3. High power factor: The power factor is the load on the grid. Generally, there are no mandatory indicators for electrical appliances below 70 watts.

4. Drive 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 one LED failure will not affect the normal operation of other LEDs, which will be higher for cost. The first is direct constant current supply, and the LEDs operate in series or in parallel. But there are obvious shortcomings: poor flexibility, the advantage is that the cost is relatively low.

These two forms coexist for a while. Multi-channel constant current output power supply mode will be better in terms of cost and performance. Perhaps 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. Therefore, we must strengthen protection in this regard. For example, LED lamps installed outdoors, due to the start of the grid load and the detection of lightning strikes, will invade various surges from the grid system, and some surges will cause LED damage. Therefore, the LED driver power supply must have the ability to suppress the intrusion of surges and protect the LEDs from damage;

6. Protection function: In addition to the conventional protection function, it is better to increase the LED temperature negative feedback in the constant current output to prevent the LED temperature from being too high;

7. Protection: The external installation of the lamp, the power structure should be waterproof and moisture-proof, and the outer casing should be light-resistant;

8. The life of the drive power source is adapted to the life of the LED;

9. To comply with safety and electromagnetic compatibility requirements;

Led switching power supply application range

Most of them provide driving capabilities for LED spotlights such as LED spotlights, LED strips, LED street lights, LED bulbs, LED buried lights, LED ceiling lights, LED flat lights, and LED wall washers. The biggest feature of led switch power supply is waterproof, it can be used outdoors, and it is not afraid of rain, fog, direct sunlight and other bad weather.

With the rapid development of the switching power supply industry technology, the LED waterproof switching power supply has also been done well enough. Its characteristics are obvious, but at the same time there is a need for improvement. I believe that with the passage of time and the development of technology, the power supply of LED waterproof switch power supply and even various equipment will have great improvement in cost and product performance. .