What are the conduction conditions of thyristors?

Working conditions of thyristors:

When a thyristor is subjected to reverse anode voltage, regardless of the voltage applied to the gate, the thyristor remains in an off state.

When a thyristor is subjected to a positive anode voltage, it only conducts when the gate is subjected to a positive voltage.

3. When the thyristor is conducting, as long as there is a certain positive anode voltage, regardless of the gate voltage, the thyristor remains conducting. That is, after the thyristor is conducting,

The door has lost its function.

4. When the main circuit voltage (or current) decreases to near zero while the thyristor is conducting, the thyristor will turn off.