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Talk about the structural characteristics and industrial application of SCR
SCR (Silicon Controlled Rectifier) referred to as SCR, is a high-power electrical components, 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 drive device to control high-power equipment with a low-power control. It is widely used in AC/DC motor speed control system, power regulation system and servo system.
The controllable silicon is divided into two kinds: one-way controllable silicon and two-way controllable silicon. Two-way thyristor is also called triac, referred to as TRIAC. The bidirectional thyristor is structurally equivalent to two unidirectional thyristor reverse connection, which has bidirectional conduction function. Its on-off state is determined by the control pole G. A positive pulse (or negative pulse) is applied to the control pole G to turn it on in the forward (or reverse) direction.
The advantage of this device is that the control circuit is simple and there is no reverse voltage problem, so it is especially suitable for AC non-contact switch. We use a one-way thyristor, which is often said that ordinary thyristor, it is composed of four layers of semiconductor materials, there are three PN junctions.
There are three external electrodes: the electrode led by the first layer of P-type semiconductor is called anode A, the electrode led by the third layer of P-type semiconductor is called control electrode G, and the electrode led by the fourth layer of N-type semiconductor is called cathode K. As can be seen from the circuit symbol of thyristor, it is a unidirectional conductive device like diode, and the key is to add a control electrode G, this gives it a completely different operating characteristic from that of a diode.
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