Jiangxi Province in the industry landscape project to install Ltd., founded in 1994. For 20 years, the industry, adhering to the "Albert Hing China, a human light" corporate mission, to create the industry's well-known "in the industry" brand. In today has grown into a company with many years in the landscape lighting project design, budgeting, construction site management, installation, LED electronic products R & D, manufacturing and sales of high-tech enterprises. Companies with urban and road lighting engineering contractor qualification, special lighting engineering design B qualification, intelligent building three qualifications. Design basis LED 1, LED drive power LED according to the characteristics of the design elements, which is safe to use the constant current drive type, the constant current driver circuit is characterized by: a constant current output, and outputs it as the DC voltage load resistance changes of different sizes within a certain range, the resistance load is small, the output voltage is low, the greater the load resistance, the output voltage is higher. Attentive readers may find on the market as the main components of the LED products, they use a simple capacitor step-down mode, constant current through a capacitor to achieve the role of these products has a fatal flaw, it is often in the switching power supply instantly, once burned down the LED device, the reason that the charging and discharging characteristics of the capacitor caused by the differential circuit where the capacitance of the capacitor is, the arc tube internal resistance to the time parameter t is equivalent to the differential resistance of the circuit, differential circuit = 0.7RC, the charge and discharge at the moment t, the instantaneous current flowing through the LED's great (the number may reach ten times the normal current of even hundreds of times), resulting in permanent damage to the chip instantly. A higher reliability of the LED drive circuit shown in Figure 1 (compare Used LED series applications): This circuit, C 1 can be omitted, another inexpensive U1 can use diodes instead of the common drawback of this circuit is its low efficiency night lighting project cost when using dozens (65 or less) than light tube series, high efficiency. The circuit can also be simplified, cancel U1 C1 ultra-cheap fares and building lighting, Q1 base can be directly connected to the lower end of R1, steady flow of 0.6/R1 decisions taken when R1 30 ohms, a constant current of 20mA. Jiangxi Province in the industry landscape project to install landscape lighting Engineering Limited is engaged in the design, budgeting, construction site management, installation, LED electronic products R & D, manufacturing and sales of high-tech enterprises. Companies with urban and road lighting engineering contractor qualification, special lighting engineering design B qualification, intelligent building three qualifications. Jiangxi Province in the industry landscape project to install landscape lighting Engineering Limited is engaged in the design, budgeting, construction site management, installation, LED electronic products R & D, manufacturing and sales of high-tech enterprises. Companies with urban and road lighting engineering contractor qualification, special lighting engineering design B qualification, intelligent building three qualifications. Early 1980s technological breakthrough is the development of a AlGaAs LED lighting buildings much money can emit red light at 10 lumens per watt luminous efficiency. LED lights began to be used outdoors as well as information dissemination car brake light (CHMSL) devices. 1990, developed to provide the equivalent of the best red AlInGaP technology device performance, which was more than the standard GaAsP device performance 10 times higher. Nanchang building lighting | building lighting ultra-low fees | in city lighting engineering sector budget provided by China lighting industry. This information consists of: landscape engineering industry in Jiangxi Province Installation Co., Ltd. (www.jxzhongye.com.cn) offer, we are Commercial Union membership, the integrity of the whole network authentication provider. Feel free to contact us, contact: Xiongjing Li