High frequency welded pipe unit is a type of equipment used for manufacturing steel pipes. It uses high-frequency current to heat the steel strip to the welding temperature, and then welds the steel strip into a tubular shape through pressure. The high-frequency welded pipe unit mainly consists of an uncoiler, a shearing machine, a welding pipe machine, a cooling machine, a cutting machine, etc. It can produce welded pipes of various specifications and materials, widely used in industries such as construction, bridges, pipelines, automobiles, machinery, etc. The high-frequency welded pipe unit has the advantages of high production efficiency, low cost, and good welding quality, and is one of the indispensable equipment in modern industrial production. Steel Pipe Making Machine,ERW Steel Pipe Making Machine Line ,Tube Mill,Steel Coil Materials Pipe Making Machine ST Machinery Co.,Ltd , https://www.stpipemill.com
Silan Microelectronics Introduces SCR Dimmable LED Lighting Driver SDH700X
LED lighting is one of the core strategic product lines of Silan Microelectronics. The company has carried out continuous research and development on LED lighting driver series chips and solutions. In the early stage, it has launched five series of dozens of driver chips for independent innovation. Recently, a new generation of LED lighting products thyristor dimming LED lighting driver SDH700X has been introduced, which solves the most important external component simplification and integrated packaging of LED lighting driving. The solution can be widely applied to LED spotlights and fluorescent lamps. Different thyristor dimming lighting fields such as bulbs, downlights and ceiling lamps. SDH700X is a non-isolated LED driver control chip dedicated to thyristor dimming. The chip adopts non-isolated buck-boost structure. The unique dimming control method of Silan Microelectronics is suitable for most of the products. Silicon controlled dimmer. The current accuracy is high when the maximum conduction angle of the chip is high, which can reach 3; the chip power supply problem of the thyristor dimmer with a small conduction angle is solved by the built-in high voltage power supply module. The SDH700X has built-in multiple protection functions to enhance system reliability, including output open-circuit protection, cycle-by-cycle overcurrent protection, feedback loop open circuit protection, sampling resistor open circuit protection, and over temperature protection. All protections have an automatic restart function. At the same time, the SDH700X adopts the high-voltage start-up patent of Silan Microelectronics and has a built-in high-voltage start-up circuit for fast start-up. In addition, the SDH700X has a built-in high-voltage power MOSFET in a SOP-16 package, which effectively saves system cost and overall machine size. The linearity and load regulation of the system are excellent, and the influence of the dimmer without the current is small.