5SHY4045L0004 ABB 半导体可控硅

5SHY4045L0004 ABB 半导体可控硅是一种由硅制成的单向半导体器件，基本上晶闸管（SCR）是一种三端子四层半导体器件，由交替的P型和N型材料组成。

5SHY4045L0004 ABB 半导体可控硅具有三个pn结J 1、J 2和J 3，下图显示了具有 pnpn 层的 晶闸管。晶闸管具有端子 阳极(A)、阴极(K) 和 栅极G)，栅极端子 (G) 连接到靠近阴极 (K) 端子的 p 层。

5SHY4045L0004 ABB 半导体可控硅四层像两个晶体管一样工作，它们连接在一起（如下图所示），一个的输出形成另一个的输入，门作为一种“启动马达”来激活它们。

5SHY4045L0004单个晶闸管（SCR）是一个 pnp 晶体管 (Q 1 ) 和一个npn 晶体管(Q 2 ) 的组合。这里，Q1的发射极作为 SCR 的阳极端子，而 Q2的发射极是它的阴极。另外，Q1的基极与Q2 的集电极连接，Q1 的集电极与Q 的基极连接，晶闸管的栅极端子也连接到Q2的基极。

5SHY4045L0004

5SHY4045L0004 ABB 半导体可控硅它是将GTO片与反并联二极管和门极驱动电路集成在一起，再与其门极驱动器在外围以低电感方式连接而成。也就是门极集成化的GTO (Gate Turn Off)。GCT在整流环节中与SCR-脉相承，SCR是Silicon Controled Rectifier的缩写，是可控整流器的简称。可控硅有单向、双向.可关断和光控几种类型。它具有体积小、重量轻、效率高、寿命长、控制方便等优点，被广泛用于可控整流、调压、逆变以及无触点开关等各种自动控制和大功率的电能转换的场合。单向可控硅是一种可控整流电子元件，能在外部控制信号作用下由关断变为导通，但一旦导通，外部信号就无法使其关断，只能靠去除负载或降低其两端电压使其关断。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，差别在于可控砖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。

5SHY4045L0004

5SHY4045L0004 ABB 半导体可控硅双向可控砖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。这是因为双向可控娃在一个万向导通结束时，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。
5SHY4045L0004 ABB 半导体可控硅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。

5SHY4045L0004

5SHY4045L0004 ABB semiconductor thyristor is a unidirectional semiconductor device made of silicon, basically a thyristor (SCR) is a three-terminal four-layer semiconductor device, consisting of alternating P-type and N-type materials.

The 5SHY4045L0004 ABB semiconductor thyristor has three pn junctions J1, J2 and J3. The figure below shows a thyristor with a pnpn layer. The thyristor has A terminal anode (A), a cathode (K), and a gate G), and the gate terminal (G) is connected to a p layer near the cathode (K) terminal.

The 5SHY4045L0004 ABB semiconductor thyristor four layers work like two transistors, they are connected together (as shown below), the output of one forms the input of the other, and the gate acts as a kind of “starter motor” to activate them.

The 5SHY4045L0004 single thyristor (SCR) is a combination of a pnp transistor (Q1) and an npn transistor (Q2). Here, Q1’s emitter acts as the anode terminal of the SCR, while Q2’s emitter acts as its cathode. In addition, the base of Q1 is connected to the collector of Q2, the collector of Q1 is connected to the base of Q, and the gate terminal of the thyristor is also connected to the base of Q2.

5SHY4045L0004

5SHY4045L0004 ABB semiconductor thyristor It is a GTO chip integrated with an anti-parallel diode and a gate driver circuit, and then connected with its gate driver in a low inductance mode at the periphery. This is the GTO (Gate Turn Off). GCT is connected with SCR- pulse in the rectification link, SCR is the abbreviation of Silicon Controled Rectifier, is the abbreviation of controlled rectifier. Thyristor has unidirectional and bidirectional. Can be turned off and light control several types. It has the advantages of small size, light weight, high efficiency, long life, easy control, etc., and is widely used in various automatic control and high-power electric energy conversion occasions such as controlled rectification, voltage regulation, inverter and contactless switch. Unidirectional thyristor is a controlled rectifier electronic component that can be turned off by an external control signal, but once it is turned on, the external signal cannot be turned off, and it can only be turned off by removing the load or reducing the voltage at both ends. Unidirectional thyristor is a four-layer three-terminal semiconductor device composed of three PN junction PNPN, compared with a diode with one PN junction, unidirectional thyristor is controlled by the control electrode current, compared with a triode with two PN junction, the difference is that the controlled brick has no amplification effect on the control electrode current. Bidirectional thyristor has the characteristics of turning on and off in two directions.
5SHY4045L0004 ABB semiconductor thyristor bidirectional controllable brick is essentially two anti-parallel unidirectional thyristor, which is a semiconductor device composed of four PN structures formed by NPNPN five layers of semiconductors and three electrodes. Because the structure of the main electrode is symmetrical (all from the N layer), its electrodes are not called anode and cathode like unidirectional thyristors, but the first electrode A1 that is very close to the control is called the second electrode A2. The main disadvantage of bidirectional thyristors is the low ability to withstand the voltage rise rate. This is because the bidirectional controllable child at the end of a million pilot, the silicon wafer in each layer of the carrier has not returned to the cutoff state position, must take appropriate protective measures.
5SHY4045L0004 ABB semiconductor thyristor bidirectional thyristor components are mainly used in AC control circuits, such as temperature control, light control, explosion-proof AC switches, and DC motor speed regulation and commutation circuits. The thyristor is always in the open state above the maintenance current, the turn-off current is high, the control is difficult, and the turn-off speed is slow. In the inverter link, SCR has excellent performance in LCI(load commutated inverter), which can achieve large power, high voltage and large current. Diode (uncontrolled rectifier device) and SCR (semi-controllable) rectifier do not require PMW to meet the two-quadrant inverter work, PWM requires IGBT (full control) and other devices.