Triconex 4351B Tricon Communication Modules

The reverse blocking mode of a thyristor is a condition in which the thyristor blocks the flow of current in the reverse direction, i.e., it does not allow current to flow from the anode to the cathode.

In reverse blocking mode, the thyristor is reverse biased, which means that the application of voltage to the anode and cathode terminals results in a lower potential at the anode than at the cathode. The cathode is positive and the anode is negative. This reverse bias prevents the thyristor from opening or conducting current in the forward direction.

A thyristor is a three-terminal device, i.e., anode (A), cathode (K), gate (G), and four-layer device. The terminal connected to the outer P region is called the anode (a) and the terminal connected to the outer N region is called the cathode (k). The inner region of the P layer is connected to the terminal gate (G).

Thyristors have three modes of operation: (i) reverse blocking mode; (ii) forward blocking mode; and (iii) forward conduction mode. In the detailed mode of operation, we can see the static VI characteristics of the thyristor.