5SHY3545L0016 3BHB020720R0002 ABB thyristor

product description：

Silicon-Controlled Rectifier (SCR) is a semiconductor device, also known as bidirectional thyristor. It is a structure consisting of three or more layers of semiconductor material that is commonly used to control current in power systems. Thyristor has unique electrical properties that make it an important component in electronics and power applications.

The main feature of thyristor is its bidirectional conductivity. Under forward voltage, it behaves as a rectifier that can convert alternating current to direct current. Under the action of reverse voltage, it is in a blocked state and does not conduct electricity. The main advantage of thyristor is that it is controllable and can be controlled through an external trigger or control circuit to control its conduction and blocking. This controllability makes thyristor widely used in power control and power regulation.

The basic structure of thyristor is composed of three semiconductor material layers: N-type semiconductor, P-type semiconductor and N-type semiconductor. This structure is often represented as a PNPN. The first N-type semiconductor layer is called the anode (A), the first P-type semiconductor layer is called the anode gate (G1), the second N-type semiconductor layer is called the cathode gate (G2), and the last N-type semiconductor layer is called the cathode (K).

The working principle of thyristor is based on the rectification characteristics of PN junction. When A forward voltage is applied between A and K of the thyristor, the PN junction is in a forward bias state and current can flow through the rectifier. Once A trigger pulse (usually a sudden positive voltage pulse) is applied, a current path is formed through the PN junction between G1 and A, switching the thyR from the blocked state to the on-state. Once the thyristor is on, it will continue conducting until the current drops to zero or A reverse voltage is applied between A and K.

Thyristor is widely used. In power systems, thyristors are often used in power modulation and power control applications, such as AC voltage regulation, dimming, motor control and AC frequency converters. It is also used in fields such as welding machines, electric furnaces, elevators and power transmission. In addition, thyristor is also widely used in electronic circuits in switching and protection devices, such as switching power supplies, current protection devices and overvoltage protection devices.

In short, as a controllable semiconductor device, thyristor plays an important role in power systems and electronic circuits. Its bidirectional conductivity and controllability make it ideal for power regulation, control and protection. With the continuous advancement of technology, the application of thyristor will continue to expand and play a greater role in the field of power and electronics.

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