T700102504BY

Thyristors - SCRs are a type of semiconductor that is widely used in power electronics applications. It is a three-terminal semiconductor switch, with two terminals dedicated to control and one that can conduct current. An SCR is known as a “thyristor” because it is a four-layer device composed of two p-n-p-n junctions, each separated by a thin layer of metal.

The most common application for SCRs is in the control of electric motors, which can be controlled differently depending on the application field. When used in motor controllers, they can be used as discrete switches, or can be configured as pulse-width modulators. In this way, they can be used to vary the speed of the motor, as well as providing a stable voltage and current supply.

SCRs have also developed applications in AC power control, where they can be used for both voltage and current protection. By using an SCR to shunt current, it is possible to stop or reduce large fluctuations in current and voltage, in order to protect the connected electrical equipment from damage. It is also possible to modify the firing angle of an SCR to control the amount of power transferred from one system to the other.

The working principle of an SCR is relatively simple and relies on the generation of an electric current when a current is supplied to the “gate”. This current creates an electric field which, in turn, causes electrons to flow between the two p-n-p-n junctions. The current so generated is proportional to the gate current and can be controlled by the gate voltage. When the gate voltage is removed, no current can be generated, and the device is then considered to be off.

In addition to motor control and AC power control, SCRs can be used for many other applications. For example, they can be used in power supplies, motor starters, inverters, relay circuits and also for grounding, switching and rectification. They are also used in logic circuits and power circuits, providing a versatile and reliable solution for many commercial, military and industrial applications.

In summary, SCRs have a wide range of applications and are one of the most popular types of semiconductor for power electronics applications. By controlling the gate voltage, it is possible to control the amount of current and voltage supplied to the connected electrical system, providing a safe and reliable alternative to traditional mechanical switches.