In this video, we explained the structure and operation logic of thyristors used in fast switching tasks in power electronics circuits. Thyristors consist of four semiconductor types P and N. Thyristors are also known by the abbreviation SCR, the initials of the words Silicon Controlled Rectifier.
Thyristors have three legs. One of them is Anode, the other is Cathode and the last is Gate. Abbreviations A, K and G are used for these. When we look at the internal structure, we can see that it consists of PNPN structure.
How does a thyristor work? The operating logic of the thyristor is very similar to the transistor. But there are minor differences. As soon as a small triggering current flows through the gate end of the thyristor, a current flows through the anode end to the cathode end. In other words, a small triggering current from the gate end and a current between the anode and cathode are controlled. Whereas the current controlled in the transistor is generally very small currents at the mA level, the currents of different sizes from mA to A are controlled at the thyristor.
It is possible to come across different types of thyristors in daily life. For example, the BT169 thyristor can control a current of 500mA, while the BT152 thyristor can control a current of about 13A. With the 25RIA120 thyristor, a much larger current of approximately 25A can be controlled.
As mentioned here, thyristors are used as switching elements in power electronics. They are also used for directional and speed control of AC and DC motor driver boards. In addition, AC power switching and power control, time relay, electronic contactors and so on. They are also used in places.
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