Introduction to thyristors

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Thyristor is the abbreviation of Thyristor. It is called a thyristor. It is a high-power switching semiconductor device. It is represented by the symbol "V" and "VT" in the circuit. "SCR" means).

The thyristor has the characteristics of silicon rectifying device, can work under high voltage and high current conditions, and its working process can be controlled and widely used in controllable rectification, AC voltage regulation, non-contact electronic switching, inverter and frequency conversion. In the circuit.

First, the type of thyristor

Thyristors are available in a variety of classification methods.

1. Classification by turn-off, conduction and control

Thyristors can be divided into common thyristors, bidirectional thyristors, reverse thyristors, gate turn-off thyristors (GTOs), BTG thyristors, temperature-controlled thyristors and light-controlled thyristors according to their turn-off, conduction and control modes.

2, according to pin and polarity classification

Thyristors can be divided into two-pole thyristors, three-pole thyristors and four-pole thyristors according to their pins and polarities.

3, classified by package form

Thyristors can be divided into three types: metal package thyristors, plastic thyristors and ceramic package thyristors. Among them, the metal package thyristor is further divided into a bolt shape, a flat plate shape, a round shell shape and the like; the plastic sealing thyristor is further divided into a heat sink type and a heat sink type.

4, according to current capacity classification

Thyristors can be divided into high-power thyristors, medium-power thyristors and low-power thyristors according to current capacity. Generally, high-power thyristors are mostly packaged in a metal case, while medium- and small-power thyristors are mostly packaged in a plastic or ceramic package.

5, according to the shutdown speed classification

Thyristors can be divided into ordinary thyristors and high frequency (fast) thyristors according to their turn-off speed.

Figure 8-1 is a classification diagram of the thyristor, Figure 8-2 is the shape of the thyristor, and Figure 8-3 is the circuit diagram symbol of the thyristor.