描述
单向可控硅是由三个PN结PNPN组成的四层三端半导体器件,与具有一个PN结的二极管相比,单向可控硅正向导通受控制极电流控制;与具有两个PN结的三极管相比,差别在于可控硅对控制极电流没有放大作用。双向可控硅具有两个方向轮流导通、关断的特性。双向可控硅实质上是两个反并联的单向可控硅,是由NPNPN五层半导体形成四个PN结构成、有三个电极的半导体器件。由于主电极的构造是对称的(都从N层引出),所以它的电极不像单向可控硅那样分别叫阳极和阴极,而是把与控制极相近的叫做第一电极A1,另一个叫做第二电极A2。双向可控硅的主要缺点是承受电压上升率的能力较低。这是因为双向可控硅在一个方向导通结束时,硅片在各层中的载流子还没有回到截止状态的位置,必须采取相应的保护措施。双向可控硅元件主要用于交流控制电路,如温度控制、灯光控制、防爆交流开关以及直流电机调速和换向等电路。可控硅在维持电流以上一直处于开通状态,关断电流高,控制困难,关断速度较慢。逆变环节中,在LCI(负载换相逆变器)中SCR具有优异表现,可做到超大功率,电压高、电流也大。二极管(Diode,不可控整流器件)和SCR(半可控)整流均不需要PMW即可满足两象限变频器工作,PWM需要用IGBT(全控)等器件。
5SHY4045L0006 3BHB030310R0001 3BHE039203R0101 GVC736CE101
Unidirectional thyristor is a four layer three terminal semiconductor device composed of three PN junctions PNPN. Compared with diodes with one PN junction, the forward conduction of unidirectional thyristor is controlled by the control pole current; Compared with a transistor with two PN junctions, the difference is that the thyristor has no amplification effect on the control electrode current. Bidirectional thyristor has the characteristic of conducting and turning off alternately in two directions. Bidirectional thyristors are essentially two anti parallel unidirectional thyristors, which are semiconductor devices composed of four PN structures formed by NPNPN five layer semiconductors and have three electrodes. Due to the symmetrical structure of the main electrode (all led out from the N layer), its electrodes are not referred to as anodes and cathodes respectively like unidirectional thyristors. Instead, the electrode that is similar to the control electrode is called the first electrode A1, and the other is called the second electrode A2. The main drawback of bidirectional thyristor is its low ability to withstand voltage rise rate. This is because when the bidirectional thyristor completes conduction in one direction, the charge carriers in each layer of the silicon wafer have not yet returned to the cut-off state, and corresponding protective measures must be taken. Bidirectional thyristor components are mainly used in AC control circuits, such as temperature control, lighting control, explosion-proof AC switches, and DC motor speed regulation and commutation circuits. The thyristor is always in an open state above the maintenance current, with high turning off current, difficult control, and slow turning off speed. In the inverter stage, SCR has excellent performance in LCI (Load Commutated Inverter), which can achieve ultra high power, high voltage, and high current. Diode (uncontrollable rectifier) and SCR (semi controllable) rectifiers do not require PMW to meet the operation of two quadrant inverters, while PWM requires devices such as IGBT (fully controlled).
专业销售世界各大电气品牌产品产品海外直接采购,正品库存,价格优惠售后保修,型号齐全,一样的产品,不一样的价格与服务。大量供应原装进口DCS系统配件,PLC系统配件。主营:ABB、GE发那科、Bentl本特利、Triconex英维思、Woodward伍德沃德、Foxboro福克斯波罗、Westinghouse西屋/Emerson艾默生、Reliance瑞恩、SchneiderModicon施耐德莫迪康、A-B、HIMA黑马、Motorola摩托罗拉、Kollmorgen科尔摩根Bosch/Rexroth/博世力上乐,NI,YOKOGAWA横河,等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统停产备件。
ABB PU412 3BSE056479R1 RTA板通讯盒MB300
ABB PU519 3BSE01 8681R1 RTA板.
ABB PU518 3BSE018680R1 RTA板
PU517 ABB PCB板卡3BSC980050R46
ABB PU516A 3BSE032402R1电路板模块PU516
PU516 3BSE013064R1 ABB模块
ABB PU514A 3BSE013062R1板卡PU514
ABB PU513v2 PC板卡3BSE013034R1 PU513v2
ABB PU512V1 RTA板卡3BSE004736R1 C2750-66601
ABB PU512v2 3BUR001401R1 电路板PU512v1
ABB PU515A 3BSE032401R1电路板PC板
ABB PPC905AE101 3BHE014070R0101 PC板PPC905
ABB PPC902AE101 3BHE010751R0101电路板模块
ABB PPC380AE02 HIEE300885R0102模块
ABB PPC380AE01 HIEE300885R1电路板模块
PPC322BE ABB HIEE300900R0001 PP C322 BE1处理单元模块
ABB PPC902CE101 3BHE028959R0101电路板模块
ABB PROCESS PANEL 245 PP245 3BSC690103R1过程面板显示屏
ABB PROCESS PANEL 245 PP245 3BSC690103R1过程面板显示屏
PP877 K 3BSE069272R2 ABB触摸屏控制面板PP877K
ABB PP865 3BSE042236R1控制面板触摸屏显示屏
ABB PP865A 3BSE042236R2控制面板触摸屏显示屏
ABB PP846A 3BSE042238R1触摸屏操作面板
PP836A ABB Panel 800 3BSE042237R2控制面板触摸屏
ABB Panel 800 PP835A 3BSE042234R2控制面板显示屏
ABB PP826A 3BSE042244R2控制面板操作屏幕显示屏Panel 800
购买咨询热线/Phone:18859254943
邮箱/Email:sales@ygdcs.com
地址:成都高新区天益街北巷52号附14号2层