Thyristors are a family of semi conductor devices sharing a common characteristic.. they will latch to the last position. if its conducting or On, it remain ON until the current drops below the threshold level.
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The syllabus mentions about the SCR, the oldest generation of thyristors. We will cover other types such as DIAC and Trics. In ths short session we will look at the characteristic, the construction and the operation. We will startt with the oldest, which is the Shockley diode. As this diode allows current to flow one way only, two shockley diodes are combined to form a diac, which allow current to flow both ways.
Then we look at the characteristic of the DIAC |
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| Opto-thyristors has the same characteristics like the earlier mentioned items. but with one different, it operated by light like the photodiodes. The students need to remember the basic characteristic of semiconductor, the resistance decreases as the temperature increases. The resistance reduce as it receive more light. When resistance reduces, current increase |
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These Thyristors are widely used in many products which needs triggering or controlling.
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