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What is a Thyristor?

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What is a Thyristor?

Thyristor definition

SCR for short, is a high-power electrical component, also known as thyristor. 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 realize the control of high-power equipment with low-power control. It has been widely used in AC and DC motor speed control system, power regulation system and servo system.

Thyristor structure

It is composed of 4 layers of semiconductor material, with three PN junctions and three external electrodes.

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Thyristor conduction conditions

One is to apply A positive voltage between its anode A and cathode K
The second is to input a forward triggering voltage between the control pole G and the cathode K

Main parameters of Thyristor

Average current in rated on-state IT
Forward blocking peak voltage VPF
Reverse blocking peak voltage VPR
Trigger voltage VGT
Maintain current IH

Thyristor classification

Ordinary thyristor
Bidirectional thyristor
Reverse conduction thyristor
Gate turn-off thyristor (GTO)
BTG thyristor
Temperature controlled thyristor
Optically controlled thyristor

Purpose of Thyristor

Controlled rectification

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