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Analysis of the structure characteristics and working principle of SCR
SCR is a P1N1P2N2 four-layer three-terminal structure element with three PN junctions. When analyzing the principle, it can be regarded as consisting of a PNP tube and an NPN tube. Its equivalent diagram is shown on the right. TRIAC: A TRIAC is a silicon controlled rectifier device, also known as a bidirectional thyristor.
This device can realize non-contact control of alternating current in the circuit, control large current with small current, and has the advantages of no spark, fast action, long life, high reliability and simplified circuit structure. From the outside, the two-way thyristor and ordinary thyristor is very similar, there are three electrodes.
However, except for one of the electrodes G, which is still called the control electrode, the other two electrodes are usually no longer called the anode and cathode, but are collectively referred to as the main electrodes Tl and T2. Its symbol is also different from ordinary thyristors, which are drawn by connecting two thyristors together in reverse.
Its model is generally represented by "3CTS" or "KS" in our country. Foreign information is also expressed by "TRIAC. The specifications, model, shape and electrode pin arrangement of the triac vary from manufacturer to manufacturer, but most of its electrode pins are arranged from left to right according to the order of T1, T2 and G (when observed, the electrode pins are downward, facing the side marked with characters).
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