At present, with the promotion of LED outdoor lighting, its market share is also increasing, but the stability and reliability of LED drive power has become the biggest problem for customers. The main manufacturers of existing outdoor power sources are roughly divided into three categories: (1) old manufacturers with relatively famous brands on the market; (2) peripheral manufacturers with Zhongshan lamp market as the guide; (3) Pearl River Delta and Yangtze River Delta New strength power supply manufacturers. The above-mentioned manufacturers have their own advantages and disadvantages. From the perspective of quality and reliability, it is understandable that the old manufacturers of the brand; from the price point of view, manufacturers around Zhongshan have more advantages. Today Xiaobian is analyzed from the perspective of a technician who has been working for many years. At present, the outdoor waterproof power supply wattage is distributed around 30-300 watts, 100 watts is a demarcation point, 100 watts or less uses a unit price PFC line, more than 100 watts uses a two-stage line (PFC PWM), and more than 150 watts generally use the PFC LLC structure. This is a more reasonable option. However, most manufacturers in Zhongshan Guzhen are almost single-stage PFC structures below 150 watts. It is high risk to use 150 watts of single-stage PFC with existing IC technology. The current and voltage stress of MOS is very high and damaged. There are problems with rate and reliability, and IC drive capability is not enough. The purpose of the ancient town manufacturers to do this is for two reasons, one is the low-cost strategy of the ancient town lamp with the market and the cash spot principle, and the second is limited by the development technology and production technology level of the factory. The old brand power supply manufacturers plan to meet the above requirements, and more is that they use a two-stage structure above 60W, 60-100 watts use PFC PWM, more than 120 watts use PFC LLC full resonant circuit, improve efficiency To ensure reliability, but there is a problem that cannot be ignored, because the brand manufacturer's product certification is relatively early, the product IC solution is older, so there are more peripheral devices, and the probability of bad is greatly increased. Their strength lies in the material and The strictness of process control. The solution for the new power supply manufacturer is almost the same as I said before, and it is more cost-effective and reliable. Take the Dongguan crown as an example: the outdoor waterproof power supply is divided into four major cases, all of which have achieved UL\CUL, (40-65 watts/65-95 watts) are two series, all adopting a single-stage PFC structure. The risk of lightning surges in the outdoor power supply single-stage structure is very large, which is the biggest problem of outdoor power supply. The collar adopts the input multi-level lightning protection technology, and the voltage of the main MOS tube is used above 800V, so that the overall protection against lightning strikes exceeds 6KV, and no additional lightning protection device is required for the customer, which is outstanding in the whole industry. The 100-140W adopts PFC PWM (quasi-resonant circuit) to ensure efficiency and reliability, and also applies 6KV lightning protection technology. The 150-220 watt series adopts PFC LLC (full resonance structure), which can achieve low interference and high efficiency. Adopting the latest MOS technology (GaN MOS), ultra-low loss and low junction capacitance, combined with PC95's high temperature and low loss material, the overall efficiency is greater than 94.5, (36V/7A) greatly reduces heat generation and improves reliability. With 6KV anti-lightning technology, it is a reliable and reliable product. In summary, the new MOS technology is now introduced, that is, the large-scale promotion of GaN MOS, ultra-small junction capacitance, ultra-low internal resistance characteristics, will cause the LED power supply operating frequency to rise to about 500K, which will greatly reduce the inside of the power supply. The size of the power device reduces the overall power supply size and increases the power density. Improve the efficiency of the whole machine, and make the power supply technology and stability to a new level.
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