Thyristor working principle and working conditions

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Thyristor working principle and working conditions

(1) Working principle

During the working process of the thyristor T, its anode A and cathode K are connected with the power source and the load to form a main circuit of the thyristor, and the gate G and the cathode K of the thyristor are connected with the device for controlling the thyristor to form a control circuit of the thyristor.

(2) Working conditions

1. When the thyristor is subjected to the reverse anode voltage, the thyristor is turned off regardless of the voltage the gate is subjected to.

2. When the thyristor is subjected to the forward anode voltage, the thyristor is turned on only when the gate is subjected to the forward voltage.

3. In the case of conduction of the thyristor, as long as there is a certain positive anode voltage, regardless of the gate voltage, the thyristor remains conductive, that is, after the thyristor is turned on, the gate loses its effect.

4. When the thyristor is turned on, when the main circuit voltage (or current) decreases to near zero, the thyristor is turned off.