According to the power consumption rules of the power grid and the characteristics of the LED drive power supply, the following points should be considered when selecting and designing the LED drive power supply:
1. Reliability stability, such as the driving power of LED street lamps, is installed in the sky, and the maintenance is inconvenient. Secondly, the street lamps that use the half-power output performance not only save electricity costs, but also extend the service life of the street lamps.
2. High-efficiency LEDs are energy-efficient products that require higher efficiency in driving power supplies. It is especially important for the structure in which the power supply is installed in the luminaire. Since the luminous efficiency of the LED decreases as the temperature of the LED increases, the heat dissipation performance of the LED is very important. If the power supply is more efficient, its power consumption will be smaller, and the heat generated in the lamp will be smaller, which will reduce the temperature rise of the lamp. It is beneficial to extend the service life of LED power supply and lamps.
3. The power factor correction power factor is the grid's load requirements. For constant current LED power supplies, it is recommended to have power factor correction. Because when the current passes through the grid, the impurities in the grid will affect the service life of the power supply and the luminaire. If the power factor is corrected in the power supply, it can lift the impurities generated in the power grid, thus extending the LED power supply and the luminaire more effectively. Service life.
4. There are two types of driving methods: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. In this way, the combination is flexible, and all the LED faults do not affect the work of other LEDs, but the cost will be slightly higher. The other is 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, and it is necessary to solve a certain LED failure without affecting the operation of other LEDs. 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 it is the mainstream direction in the future.
5. The ability of surge protection LEDs to resist surges is relatively poor, especially against reverse voltage capability. It is also important to strengthen protection in this area. Some LED lights are installed outdoors, such as LED street lights. Due to the start of the grid load and the induction of lightning strikes, various surges will be invaded 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 power supply 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. For the protection aspect of the lamp, the power supply structure should be waterproof and moisture-proof, and the outer casing should be light-resistant.
8. The LED power supply must not only be consistent with the service life of the LED lamp in terms of life, but also need to consider the use of the lamp when using the LED power supply.
9. LED power supplies must comply with safety and electromagnetic compatibility requirements.
With the global demand for LEDs, LED power supplies must adapt to the development trend of LEDs.
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