Have you learned about "SCR Latchup" yet? Are you familiar with this view of the thyristor equivalent circuit?brent1369 said:
Sorry, I can't parse that. A thyristor is just a PNPN structure, which is basically the same as the two transistors connected in the stacked format that I showed previously.brent1369 said:
berkeman said:
The thyristor is a type of semiconductor device that acts as a switch, allowing current to flow in only one direction. Once the gate current is applied, the thyristor turns on and allows current to flow. However, even after the gate current is removed, the thyristor will continue to conduct because of its internal structure.
A thyristor consists of four layers of alternating P-type and N-type semiconductor materials. The middle two layers form a P-N-P-N structure, with a gate terminal connected to the middle layer. This structure allows the thyristor to act as a latching switch, turning on with a small amount of gate current and staying on even after the gate current is removed.
Once the thyristor is turned on, the current flowing through the device creates a positive feedback loop, known as regenerative feedback. This feedback keeps the thyristor in the conducting state, even without the gate current. The only way to turn off the thyristor is to interrupt the current flow by reducing the voltage below a certain threshold or by applying a reverse voltage.
Yes, a thyristor can be turned off by interrupting the current flow. This can be done by reducing the voltage below a certain threshold or by applying a reverse voltage. Another way to turn off a thyristor is by using a technique called forced commutation, which involves applying a reverse current to the device to turn it off.
Thyristors are commonly used in power control circuits, such as in dimmer switches, motor speed control, and power supplies. They are also used in electronic switches, voltage regulators, and inverter circuits. Additionally, thyristors are used in high-voltage power transmission systems and as protection devices in electronic circuits.
