One-way thyristor, that is, a general thyristor, which is composed of four-layer semiconductor material, three PN junctions, three electrodes in the outer electrode [Fig. 2 (a)]: The electrode of the first layer P-type semiconductor is called anode A, The electrode of the three-layer P-type semiconductor is called the control pole G, the fourth layer N-type semiconductor is called the cathode K. As can be seen from the circuit symbol of the thyristor [Fig. 2 (b)], it is a single-directional electrically conductive device like a diode. The key is to have a control pole G, which makes it completely different from the diode. Work characteristics .

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