The development trend of LED driving power supply in 2018 and its technical characteristics!

by:MOSO     2020-02-19
LED driving power supply is a power converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Usually, the input of LED driving power supply includes high voltage power frequency AC (That is, mains) , Low voltage DC, high voltage DC, low voltage high frequency AC (Such as the output of an electronic transformer)Wait. However, the output of LED driving power supply is mostly a constant current source that can change the voltage with the change of LED forward voltage drop value. Characteristics of LED driving power supply 1. High reliability is especially like the driving power supply of LED street lamps, which is installed at high altitude and has a waterproof aluminum shell driving power supply. If the quality is good, it is not easy to break down and the number of maintenance times is reduced. 2. High efficiency LED is an energy-saving product, and the efficiency of the driving power supply is higher. It is especially important for the structure in which the power supply is installed in the lamp. Because the luminous efficiency of LED decreases with the increase of LED temperature, the heat dissipation of LED is very important. The efficiency of the power supply is high, its loss power is small, and the calorific value in the lamp is small, thus reducing the temperature rise of the lamp. It is beneficial to delay the light decay of LED. 3. High power factor power factor is the requirement of power grid for load. Generally, there is no mandatory indicator for electrical appliances below 70 watts. Although the power factor of a single appliance with low power has little effect on the power grid, it will cause serious pollution to the power grid if everyone lights up at night and the similar load is too concentrated. For 30 watts ~ 40 w led drive power supply, it is said that in the near future, perhaps there will be a certain index requirements for the power factor. 4. There are two driving modes: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. This way, the combination of flexible, all the way LED failure, does not affect the work of other LED, but the cost will be slightly higher. The other is direct constant current power supply, LED series or parallel operation. Its advantage is that the cost is lower, but the flexibility is poor, but also to solve a certain LED failure, does not affect the operation of other LED problems. These two forms coexist for a period of time. Multi-Channel constant current output power supply mode will be better in terms of cost and performance. Perhaps the mainstream direction in the future. 5. Surge Protection LED's ability to resist surge is relatively poor, especially the ability to resist reverse voltage. It is also important to strengthen protection in this regard. Some LED lights are installed outdoors, such as LED street lamps. Due to the start-up of power grid load and the induction of lightning strike, various surges will invade from the power grid system, and some surges will cause LED damage. Therefore, the LED driving power supply should have the ability to inhibit surge intrusion and protect the LED from damage. 6. Protection function power supply in addition to the conventional protection function, it is best to increase the LED temperature negative feedback 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 sun-resistant. 8. The life of the driving power supply should be adapted to the life of the LED. 9. To meet the requirements of safety regulations and electromagnetic compatibility. The development direction of LED driving power supply 1. One of the important advantages of LED is its long service life, which is about 30 thousand ~ 100,000 hours. The traditional LED driving power supply contains electrolytic capacitor, while the life of electrolytic capacitor is relatively short, about 5,000 hours, which is the main reason restricting the life of LED driving power supply, therefore, electrolytic capacitors should not be used as much as possible in LED driving power supply. 2. Improve the input power factor of the driving power supply and reduce the total harmonic distortion. 'Energy Star'(ENERGYSTAR) Solid State Lighting documents stipulate that any power level requires mandatory power factor correction. This standard is applicable to a series of products, such as desk lamps, cabinet lights, etc. Among them, the power factor of LED driving power supply for household lighting must be greater than 0. 7, commercial lighting must be greater than 0. 9. IEC61000-3- 2 harmonic content standard stipulates that total harmonic distortion should be met in lighting with power level greater than 25W ( Total Harmonic Distortion, THD)Less than 35%, power factor not less than 0. 7. The introduction of these standards puts forward higher requirements for the design of LED lighting driving power supply. 3. Reduce the volume of the driving power supply LED itself is relatively small, which is very beneficial to portable products. The driving power supply of LED should also be as small as possible so that it can be successfully installed into the LED lamp holder. In the design process, the volume of the drive power supply should be reduced as much as possible. [5] 4. Improve the reliability of the driving power supply in the working process of LED, non-human factors such as higher temperature and aging of devices will cause fatal damage to the LED body. Therefore, overvoltage protection, overcurrent protection and other protection circuits should be added to the LED driving power supply to carry out emergency treatment for accidents and ensure the safe work of the LED body. The above information is collected from the network
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