Product Details :5SHX0360D0001 ABB thyristor

Tube module

Silicon Controlled Rectifier (SCR) is a high-power electrical component, also known as a thyristor. It has

It has the advantages of small size, high efficiency and long life. In the automatic control system, it can be used as a high-power driving device to achieve small work

Rate controls control high-power devices. It has been widely used in AC and DC motor speed control system, power regulation system and servo system. Thyristors are divided into two kinds: unidirectional thyristors and bidirectional thyristors. Bidirectional thyristor is also called TRIAC, or TRIAC for short. bidirectional

The thyristor is structurally equivalent to two one-way thyristors in reverse connection, and this thyristor has a double pilot pass function. Its on-off status

Determined by the control pole G. Adding a positive pulse (or negative pulse) to the control pole G can make it forward (or reverse) conduction. The advantages of this device

The control circuit is simple, there is no reverse voltage problem, so it is particularly suitable for AC contactless switch use.

We use a unidirectional thyristor, which is often referred to as an ordinary thyristor, which is composed of four layers of semiconductor material

Three PN junctions, with three external electrodes (Figure 2(a)) : the electrode led by the first layer of P-type semiconductor is called anode A, and the third layer of P-type

The electrode led by the semiconductor is called the control pole G, and the electrode led by the fourth layer of N-type semiconductor is called the cathode K. Circuit symbol from thyristor

[Figure 2(b)] It can be seen that it is a single-direction conductive device like a diode, and the key is to have a control pole

G, which gives it completely different operating characteristics from diodes.

The P1N1P2N2 four-layer three-terminal device with silicon single crystal as the basic material began in 1957, because its characteristics are similar to vacuum gates

Flow tube, so the international known as silicon crystal thyristor, referred to as thyristor T, and because the thyristor was originally in the static rectifier side

Surface, so it is also called silicon controllable rectifier element, referred to as SCR.

In terms of performance, thyristor not only has unidirectional conductivity, but also has more valuable than silicon rectifier elements (commonly known as "dead silicon")

Controllability. It only has two states: on and off.

SCR can control high-power electromechanical equipment with milliampere-level current, if the power exceeds this, due to the significant increase in component switching loss,

The average current phase allowed to pass is reduced, at which time the nominal current should be degraded.

Thyristor has many advantages, such as: to control high power with small power, power amplification up to hundreds of thousands of times; Very quick reaction time, in

Turn on and off in microseconds; No contact operation, no spark, no noise; High efficiency, low cost and so on.

The weakness of thyristor: static and dynamic overload capacity is poor; Easily misled by interference.

Thyristor from the appearance of the main classification: bolt shape, flat plate shape and bottom shape.

Structure of thyristor element

Regardless of the shape of the thyristor, their core is a four-layer P1N1P2N2 structure composed of P-type silicon and N-type silicon. See picture

1. It has three PN junctions (J1, J2, J3) leading from the P1 layer of the J1 structure to the anode A, from the N2 layer to the negative stage K, from the P2 layer

Lead out the control pole G, so it is a four-layer three-terminal semiconductor device.

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