LED power supply is a voltage converter that converts the power supply to a specific voltage and current to drive the LEDs to illuminate. Usually: the input of the LED drive power includes high-voltage power frequency AC (ie, mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers). The output of the LED driver is mostly a constant current source that changes the voltage as the LED's forward voltage drop changes.
According to the power consumption rules of the power grid and the characteristics of the LED power supply drive, the following points should be considered when selecting and designing the LED power supply driver:
1. High reliability is especially like the driving power of LED street lamps. It is installed at high altitude, it is not convenient for maintenance, and the maintenance cost is also large.
2. High-efficiency LEDs are energy-saving products, and the efficiency of driving power supplies is high. 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 of the LED is very important. The power source has high efficiency, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LEDs.
3. High power factor The power factor is the load requirement of the grid. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of a single power consumer with low power has little effect on the power grid, at night, everyone lights up, and the similar load is too concentrated, which will cause serious pollution to the power grid. For 30 watts to 40 watts of LED driver power, it is said that in the near future, there may be certain indicators for power factors.
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 LED to resist surge is relatively poor, especially the ability to resist reverse voltage. 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, the LED temperature negative feedback is added to 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 life of the drive power should be matched to the life of the LED.
9. To comply with safety and electromagnetic compatibility requirements.
With the increasing use of LEDs, the performance of LED power drives will be increasingly suitable for LED requirements.
Finally, the majority of users are reminded to see the components on the drive power supply, whether it is made in China or not. If you want to have low quality requirements for LED explosion-proof lamps, then you can choose the driver of cheap domestic components, if you are on LED When the requirements of explosion-proof lamps are high, you have to pay attention. Now, the LED explosion-proof lamp market is in a competitive position. It is very difficult for my manufacturers to use a series of methods to reduce costs and obtain higher profits. Now everyone may know the most. It is a chip brand, and ignores the driving brand, LED explosion-proof lamp driving power supply, using imported components, its performance is stable and greatly exceeds the driving of domestic components. Ronglang Electric promises that all the components of the driving power supply of our LED explosion-proof lamps are imported components, and we can take apart our explosion-proof analysis.
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