Thyristors - SCRs

Thyristors-SCRs (Silicon Controlled Rectifiers) are widely used in power electronic devices due to their high current and voltage capabilities, good reliability and low cost prices. The SCR is a bi-directional solid-state device with three electrical terminals, an anode(A), a cathode(K) and a gate. The VS-ST303C08LFL1 is a three-terminal power thyristor with a nominal breakdown voltage of 800V and a rated current of 1.5A.

Application field

The VS-ST303C08LFL1 is mainly used as a switch in electrical circuits, providing good control of power flow between two points in the circuit. It is commonly used to switch on/off electrical loads, especially in power converter and industrial power control applications. In addition, the thyristor can be used as a phase control device, allowing the phase angle of current in the load and input power to be varied. It is also used in protection circuits such as over voltage and over current protection circuits, providing reliable protection against power system transients.

Working principle

The main principle of operation of the VS-ST303C08LFL1 is based on the generation and control of minority carriers, which allow current to flow through the device from the anode to the cathode. The minority carriers are generated when a gate current is applied to the device. Under the action of gate current, the SCR passes from a blocked state to a conductive state. The conductive state remains until the gate current is removed, and the SCR returns to its non-conductive state. The anode and cathode can also be reversed, allowing current to flow in the opposite direction when a gate current is applied.

Conclusion

The VS-ST303C08LFL1 is a three-terminal power thyristor, capable of controlling the flow of current and voltage in an electrical circuit. It is mainly used as a switch and is also used in power control and protection circuits. Its operation is based on the generation and control of minority carriers, which allow current to flow through the device from the anode to the cathode. It provides excellent control of power supply and current, as well as reliable protection against power system transients.