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I know how does an I-V curve of a thyristor look like, but is there any thyristor equation that can represent the curve?enter image description here

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Each straight line can be characterised by an equation based on 2 transistors.

enter image description here

  • The breakover or trigger voltage is the same as any power transistor, Vbe and current gain for trigger current,
  • the foldback negative resistance depends on gm in two transistors and resulting saturation voltages plus 1 diode drop and Rs or ESR.
  • The follow-on positive resistance depends on the power rating and junction size - the Rs or ESR is proportional to Pd power rating of the device. e.g. Rs=k/Pd where k is approximately = 1
    • ( the same applies to all diodes and LED's ) with a wide tolerance
  • the reverse characteristics are likely similar to transistor PIV breakdown.
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Sure, but since the thyristor has different operating conditions there is no single equation.

Like the JFET equation, in which you study differents equations before and after pich-off, in the case of the thyristor you should study the behavior when it is in blocking state, in on state and what happens when during the turn-on and turn-off process.

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