In this script, we will discuss  Power Electronics, In this blog, we will discuss 

  •  The two-transistor model can be used to describe the characteristics of a thyristor.

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The latching action due to positive feedback can be demonstrated using a two-transistor modal of the thyristor. A thyristor can be considered as two complementary transistors, one PNP -transistor, Q1, and another NPN-transistor, Q2, as shown in the figure.


Shown in figure the basic structure and Equivalent circuit shown in 2nd figure .
  • A thyristor is a four-layer semiconductor device of PNPN structure.
  • Three junctions are J1,J2 and J3.
  • It has three terminal Anode, Cathode and Gate
  • A thyristor can be considered as two complete transistor PNP and NPN.
  • Thyristors are semiconductor devices that can operate only in the switching mode.
  • Thyristor are current operated devices, a small Gate current controls a larger Anode current.
  • Conducts current only when forward biased and triggering current applied to the Gate