In this video, we tried to explain the operating logic of Triac, one of the power electronics circuit elements. Triac is an improved form of thyristor. Thyristor AC can control large currents by operating a single positive or negative alternate, while Triac is able to control large currents in both alternans of the AC waveform. So Thyristor is mostly used for DC applications, while Triac is more suitable for use in AC power applications.
TRIAC stands for English TRIode for Alternating Current. The English name indicates that this three-pin power electronic circuit element is used in alternating current.
The triacs also have three pins. One of them is Main Terminal 1 in English, the other is Main Terminal 1, the other is Main Terminal 2 and the last one is Gate. The abbreviations MT1, MT2 and G are used for these. In some sources, instead of MT1 and MT2, you may encounter the use of the nomenclature Anot1 and Anot2.
In the symbol, when we look at the internal structure of the triac in this way, the gate ends are common, two thyristors can be seen in the opposite way is connected in parallel to each other. In physical structure, it consists of connecting two structures in the form of PNPN in parallel. Thyristor is used in DC applications because it allows current to pass in one direction. Triac is preferred in AC applications since it can pass two-way current through this structure.
When a small triggering current arrives at the gate end of the triac, bi-directional current transfer between the MT2 and MT1 terminals can be achieved. This means that a large AC current between the MT2-MT1 and a small triggering current from the gate end can be controlled.
There is a video in our channel about the operating logic of the thyristor. If you haven't watched it, I suggest you take a look at that video. You can find the link to that video and similar videos below
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22 ноя 2019
