1.Why do LEDs need high-quality driving power? Because LED does not contain toxic substances, is environmentally friendly, has long life, and has many advantages such as high photoelectric efficiency, the design, production and manufacturing process of LED chips have become quite mature. The damage to the entire LED lighting system is mainly caused by the damage of the LED driver; low-quality LED driving power supplies are not protected due to insufficient protection. Perfect, constant current accuracy and low current fluctuation will cause damage to the LED chip; therefore, the LED drive power supply is the key to LED lamps. It is like a person’s heart. To manufacture high-quality LED lamps for lighting, high-quality LED lamps must be used. Only high-quality LED power drivers can meet the harsh working environment and high maintenance cost requirements of LED lighting systems.
2.What is the root cause of LED driver quality problems? First, it is designed and manufactured by non-professional power supply companies (the requirements are too scattered and the quantity is too small); The second is that the LED lamps are not designed according to the harsh working environment. a) -35 degrees to 70 degrees ambient temperature b) The waterproof design is not in place c) Lightning protection design is not in place
3.How to ensure the quality and reliability of LED drivers?
1). Standardized professional design process control Technical preliminary research, feasibility assessment, preliminary design, detailed design, engineering prototype, and small batch trial production.
2). Reasonable component design margin
3). Selection of high-quality components Electrolytic capacitors, ICs, power semiconductors, magnetic components, etc.
4). Strict quality verification and testing procedures Stress analysis, EVT, SVT, DVT and other tests and calculation and experimental verification of MTBF.
4.Why does LED driving power supply need high efficiency? High efficiency is the overall energy-saving requirement of the LED lighting system, and is the foundation and guarantee of low temperature rise, long life, and high reliability.
1). High efficiency, low loss, low temperature rise For example, an LED drive power supply with an output of 100W has a loss of 5.2W when the efficiency reaches 95%. When the efficiency is only 85%, the loss reaches 17.6W. The latter is 3.4 times of the former. Experiments show that the former under the same conditions The temperature is 10~15℃ lower than the latter.
2). Reduce the operating temperature of LED lights and delay light decay The increase in the temperature of the LED chip will lead to changes in the performance of the light-emitting device and attenuation of the electro-optical conversion efficiency, and even failure in severe cases. Experimental tests have shown that for every 5 degrees Celsius increase in the temperature of the LED itself, the luminous flux decreases by 3%.
3). High efficiency, low temperature rise, long life If you choose a high-temperature electrolytic capacitor with a lifespan of 10,000 hours at 105 degrees, and according to the company’s popular electrolytic capacitor life estimate “for every 10 degrees lowered, the lifespan doubles,” then its working life is 20,000 hours in a 95-degree environment. The working life in the environment is 40,000 hours. For example, when the operating temperature of the Lambert drive power supply is generally up to 70 degrees, and the temperature of the electrolytic capacitor is roughly controlled at about 85 degrees, the service life can reach 40,000 hours. For example, if it works 12 hours a day, The life span is nearly ten years.
4). High efficiency, low temperature rise, high reliability As the power supply temperature decreases and the working environment of ICs and power semiconductors improves, MTBF (mean time between failures) will increase significantly.
5.What is PF? What are PFCs? Why high PF? PF is the abbreviation of Power Factor, which refers to power factor, which is the ratio of active power to apparent power; PFC is the abbreviation of Power Factor Corrector, which refers to power factor correction; high power factor can:
1).Reduce current harmonics ;
2). Increase the capacity of the power system;
3). Reduce line losses and save electrical energy. Low power factor means low power efficiency. The lower the power factor value, the higher the proportion of power consumed in the distribution network. If the low power factor is not corrected, the power company must provide greater power in addition to active power. Reactive power, which results in the need for larger generators, transformers, transmission lines, etc., to compensate for losses. A power supply with PFC function can improve its own energy usage, reduce losses, and also reduce harmonic pollution to the power grid.