Question

Sketch and label the characteristics of a power thyristor and explain the relevant operating features of the device. Distinguish and explain clearly between "latching" and "holding" currents of the device

Answer 1

A power thyristor is a type of electronic device used in high-power applications. Its characteristics include doping, latching current, holding current, and triggering current. The latching current keeps the thyristor conducting, while the holding current maintains it in the off state.

Step-by-step explanation:

A power thyristor, also known as a power semiconductor switch, is a type of electronic device that controls the flow of electrical current in a circuit. It is commonly used in high-power applications, such as motor control, power supplies, and power converters. The main characteristics of a power thyristor include:

1. Doping: It is made of alternating layers of p-type and n-type semiconductors.
2. Latching Current: This is the minimum current required to keep the thyristor in the conducting state after it has been triggered. It is typically higher than the holding current.
3. Holding Current: This is the minimum current required to maintain the thyristor in the off state after the triggering current has been removed.
4. Triggering Current: This is the minimum current required to activate the thyristor and transition it from the off state to the conducting state.

Now, let's distinguish between latching and holding currents:

• Latching Current: Once the thyristor has been triggered and is conducting current, the latching current is the minimum current required to keep the thyristor in the conducting state. It is higher than the holding current.
• Holding Current: After the thyristor has been triggered and conducting current, the holding current is the minimum current required to maintain the thyristor in the off state once the triggering current is removed. It is typically lower than the latching current.