5SHY35L4520 ABB 可控硅电子元器件

可控硅简称SCR，是一种大功率电器元件，也称晶闸管。它具有体积小、效率高、稳定性好、工作可靠等优点。在自动控制系统中，可作为大功率驱动器件，实现用小功率控件控制大功率设备。它的出现，使半导体技术从弱电领域进入了强电领域，成为工业、农业、交通运输、军事科研以至商业、民用电器等方面争相采用的元件。

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描述

可控硅的作用之一就是可控整流，这也是可控硅最基本也最重要的作用。大家所熟知的二极管整流电路只可完成整流的功能，并没有实现可控，而一旦把二极管换做可控硅，便构成了一个可控整流电路。一个最基本的单相半波可控整流电路中，当正弦交流电压处于正半周时，只有在控制极外加触发脉冲时，可控硅才被触发导通，负载上才会有电压输出，因此可以通过改变控制极上触发脉冲到来的时间，来进一步调节负载上输出电压的平均值，达到可控整流的作用。

可控硅的作用之二就是用作无触点开关，经常用于自动化设备中，代替通用继电器，具有无噪音、寿命长的特点。

可控硅的作用之三就是起到开关和调压的作用，经常应用于交流电路中，由于其被触发时间不同，因此通过它的电流只有其交流周期的一部分，通过它的电压只有全电压的一部分，因而起到调节输出电压的作用。

5SHY5045L0020

One of the functions of thyristor is controllable rectification, which is also the most basic and important role of thyristor. The well-known diode rectifier circuit can only complete the rectification function and does not achieve controllability. However, once the diode is replaced with a thyristor, it constitutes a controllable rectifier circuit. In a basic single-phase half wave controllable rectification circuit, when the sinusoidal AC voltage is at the positive half cycle, the thyristor is only triggered to conduct and there is voltage output on the load when a trigger pulse is applied to the control pole. Therefore, the average output voltage on the load can be further adjusted by changing the time of the trigger pulse arrival on the control pole, achieving the effect of controllable rectification.
The second function of thyristor is to serve as a contactless switch, often used in automation equipment, replacing general relays, with the characteristics of no noise and long service life.
The third function of controllable silicon is to act as a switch and voltage regulator, which is often used in AC circuits. Due to its different triggering times, the current passing through it is only a part of its AC cycle, and the voltage passing through it is only a part of the full voltage, thus regulating the output voltage.

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  • 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

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