ABB 5SHY3545L0016 安全 PLC 和运动控制器

ABB 5SHY3545L0016 安全 PLC 和运动控制器

IGCT在整流环节中与SCR一脉相承，SCR是Silicon Controlled Rectifier的缩写，是可控硅整流器的简称。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。

ABB 5SHY3545L0016 安全 PLC 和运动控制器

IGCT is in the same vein as SCR in the rectification process, SCR is the abbreviation of Silicon Controlled Rectifier. Thyristors have one-way, two-way, turn-off and light control several types. It has the advantages of small size, light weight, high efficiency, long life, easy control and so on. It is widely used in controlled rectifier, voltage regulation, inverter and contactless switch and other automatic control and high-power power conversion occasions. Unidirectional thyristor is a kind of controlled rectifier electronic component, which can be turned off from off to on under the action of 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 the diode with one PN junction, unidirectional thyristor is controlled by the control electrode current. Compared with a triode with two PN junctions, the difference is that the thyristor has no amplification effect on the control electrode current. Bidirectional thyristor has the characteristics of turning on and off in two directions. Bidirectional thyristor 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 has 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 when the bidirectional thyristor is switched on in one direction, the carriers in each layer of the silicon wafer have not returned to the position of the cutoff state, and corresponding protection measures must be taken. 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.

ABB 5SHY3545L0016 安全 PLC 和运动控制器

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