
Based on their characteristics the NPT- IGBT, and PT-IGBT are named as symmetrical and nonsymmetrical IGBTs. The symmetrical IGBTs are the ones that have equal forward and reverse breakdown voltage. The asymmetric IGBTs are the ones that have a reverse breakdown voltage less than the forward breakdown voltage. The symmetrical IGBTs are mostly used in AC circuits, whereas the asymmetrical IGBTs are mostly used in DC circuits because they don’t need to support voltage in the reverse direction.The collector of the PNP transistor is connected to the NPN transistor through a JFET, the JFET connects the collector of the PNP transistor and the base of the PNP transistor. These transistors are arranged in a way to form a parasitic thyristor set up to create a negative feedback loop. The Resistor RB is placed to short the base and emitter terminals of the NPN transistor to ensure that the thyristor doesn’t latch-up which leads to the latch-up of the IGBT. The JFET used here will signify the structure of current between any two IGBT cells and allows the MOSFET and supports most of the voltage.




369-HI-0-M-0-0-0-E-GE通气
可编程序控制器的英文为Programmable Controller,在二十世纪70-80年代一直简称为PC。由于到90年代,个人计算机发展起来,也简称为PC;加之可编程序的概念所涵盖的范围太大,所以美国AB公司将可编程序控制器定名为可编程序逻辑控制器(PLC-Programmable Logic Controller),为了方便,仍简称PLC为可编程序控制器。有人把可编程序控制器组成的系统称为PCS可编程序控制系统,强调可编程序控制器生产厂商向人们提供的已是完整的系统了。
PLC的发展和市场情况
PLC的发展历史
1968年美国GM(通用汽车)公司提出取代继电器控制装置的要求,二年美国数字公司研制出了代可编程序控制器,满足了GM公司装配线的要求。随着集成电路技术和计算机技术的发展,现在已有五代PLC产品了。
在以改变几何形状和机械性能为特征的制造工业和以物理变化和化学变化将原料转化成产品为特征的过程工业中,除了以连续量为主的反馈控制外,特别在制造工业中存在了大量的开关量为主的开环的顺序控制,它按照逻辑条件进行顺序动作号按照时序动作;另外还有与顺序、时序无关的按照逻辑关系进行连锁保护动作的控制;以及大量的开关量、脉冲量、计时、计数器、模拟量的越限报警等状态量为主的—离散量的数据采集监视。由于这些控制和监视的要求,所以PLC发展成了取代继电器线路和进行顺序控制为主的产品。在多年的生产实践中,逐渐形成了PLC、DCS与IPC三足鼎立之势,还有其它的单回路智能式调节器等在市场上占一定的百分比。
HP Agilent 5890-A Gas Chromatograph Lab Oven
Kepco 26248 DC Power Supply Unit 208VAC 8A Rackmount
HP Agilent 5890A Gas Chromatograph Lab Oven
Reichert-Jung 8040 Digital Tissue Embedding Center 120V
PCB Piezotronics Impact Hammer Vibration Sensor
Lot of 47 Dell PowerEdge 1850 Dual Xeon CPU/1GB RAM/PSU
ACS SpiiPlus CM-2 Motion Controller System HSSI IO16 ED
NEW Tyan Transport VX50-B4985 5U Server 4x AMD Opteron
Stryker Endoscopy Ideal Eyes HD Articulating Laparoscop.
NEW Cisco ONS-XC-10G-S1 OC192SR1英维思(3008, 3625, 3508E.3721, 3700A 4351B)
本特利(3500/42M, 3500/ 22M, 3500/ 95.3500/05)
黑马(F3330, F3236, F6217, F7126, F8621A)
福克斯波罗(FBM203, FBM204, FBM217, FMB231)
AB: (1746 1747 1756 1770 1771 1785触摸屏2711系列CPU PLC)
普罗索芙特PROSOFT MVI46/56/69, AB旗下,跟AB模块
瑞恩RELIANCE模块,卡件
飞利浦EPRO MMS6210/ 621…. PR6423/003-031
美尔托Meltal MT1102-02-00, MS3101-00-00, MS3102-01-00
横河YOKOGAWA AAI, ADV, ADI, ANB, AMM, SB, PW(型号开头),卡件模块(CPU,电源,输出,PLC)
摩尔MOORE Q开头, 3开头模块,像电视显示器
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