ThyristorĪ thyristor is a four-layer semiconductor device formed by combining four layers of P-type and N-type material arranged in an alternative manner. As the consequence of drawbacks of the thyratron, thyristors came into existence. Apart from large power handling capabilities of thyratron tube, it also has some disadvantages like bulky device and less reliability. In this way, a thyratron tube help in achieving rectification and switching task. The conduction in thyratron occurs due to electrons and these gets multiplied several times when the gas present in the tube is ionized. The gases which are used in thyratrons are mercury, xenon, neon etc. The dot represented in the thyratron tube is useful for determining that the thyratron tube is filled with gases. Besides, the power which a thyratron tube can handle is much greater than that of the vacuum tube.
Like vacuum tubes, thyratron can provide rectification and switching in the electronic circuit but they cannot amplify the signal like a vacuum tube do. Thyratron came into existence after vacuum tubes. It also consists of a filament, a grid and two other terminals i.e. It needs only one low power supply and control signal to perform operation.Ī thyratron is a non-semiconductor device which consists of a tube filled with gases. It needs large power supply between anode and cathode. It is a current controlled semiconductor device which is used for rectification or Switching. It is voltage controlled non-semiconductor device used for rectification and switching in electronic circuit. The other important difference between thyristor and thyratron is described with the help of comparison chart in this article.
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