In series-connected thyristors

In series-connected thyristors

Right Answer is:

R, C is called Snubber circuit


If the required voltage rating of me assembly or equipment incorporating thyristors is more than the voltage rating of a single thyristor, then several thyristors have to be united in a series connection. When we consider a series connection of thyristors, we mean thyristors of the same class to be connected in series. Like any other semiconductor device, the characteristic properties of two thyristors of the same make and rating are never the same and this leads to the following two major problems during the series connection of the devices.

  • Unequal distribution of voltage across devices
  • The difference in reverse-recovery characteristics.

Snubber circuits: They are energy-absorbing circuits that are used to protect the circuit from overvoltage or rather absorb the voltage spikes caused by inductance present in the circuit during switching.

The RC circuit (snubber) acts as a lowpass filter for this voltage transient. The resistance has a normally low value so that the transient is absorbed by the capacitor quickly. Thus the thyristor is protected against voltage transients. The RC snubber circuit is very commonly used for the protection of thyristors against transient voltages (high-frequency voltage spikes). 

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