I. Introduction
With the continuous improvement of the luminous efficiency of white LED chips, white light chips of more than 80 lumens per watt have become the mainstream in the market, and more than 150 lumens per watt can be made in the laboratory. These exciting news and facts have made LED street lights close to the price/performance ratio of traditional metal nano lamps, and have a tendency to override traditional metal sodium lamps. The main factors restricting the popularization of LED street lamps are: First, there are many opinions that LED street lamps are inferior to traditional street lamps; second, their prices are too high, far exceeding traditional street lamps. But what is the truth? This article specifically compares the cost performance of Nanke LED street lamps with traditional street lamps, in order to prove that the era of high-performance low-cost LED street lamps has arrived.
Second, the design features and know-how of Nanke LED street light
After three and a half years of painstaking research, Nanke Group has successfully developed a series of LED street lamps with 40-watt to 300-watt performance, which is not only the world's leading performance, but also low-cost, comparable to traditional metal sodium lamps. product.
All of the above products are produced by the following technologies independently developed by Nanke, with complete independent intellectual property rights:
a, flip-chip or compact chip integrated high-power chip - the high-brightness LED chiplet is packaged on the silicon substrate by flip-chip or package technology of the integrated circuit. The silicon substrate has a high thermal conductivity and is easy to conduct, and a high-power LED chip with better heat dissipation is fabricated. At present, Nanke Group's street lamp series chips use full-series high-power chips.
b. Low voltage loss high voltage, low current constant current output LED drive scheme. The drive circuit of Nanke Group is different from the low-voltage and constant-voltage (~50~60V) but non-constant current switching power supply scheme commonly used in the industry. Instead, it adopts the high voltage (400V) of Nanke Group with independent intellectual property rights. The constant voltage of the current is added to the constant current driving circuit. In the case of normal input voltage, its power loss includes power factor correction of only about 6%, that is, its power efficiency is as high as 94%, which is the best performance driving solution in the world today.
c. In order to solve the problem of LED heat dissipation, Nanke Group developed the world's first needle-shaped heat sink with independent intellectual property rights, so that the total heat dissipation temperature is 15 °C lower than the traditional sheet radiator at 160 watts. The LED heat dissipation problem is completely solved in a simple and cost-effective manner.
d. The LED reflector cup independently developed by Nanke Group not only solves the problem of uneven distribution of light, but also makes the utilization coefficient of LED street lamp up to about 75%. This utilization factor refers to the distribution of light emitted by the lamp on the road surface that needs to be measured. In terms of.