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For thyristor operation, following statements are given: (i) The supply voltage must be greater than the forward break overvoltage. (ii) The supply voltage must be less than the forward break overvoltage. (iii) ILatching < Iholding (iv) ILatching > Iholding Which of the above statements are correct? Choose the correct answer from the code given below:

For thyristor operation, following statements are given: (i) The supply voltage must be greater than the forward break overvoltage. (ii) The supply voltage must be less than the forward break overvoltage. (iii) ILatching < Iholding (iv) ILatching > Iholding Which of the above statements are correct? Choose the correct answer from the code given below: Correct Answer (ii) and (iv)

Latching Current: It is the minimum anode current required to maintain the thyristor in the ON state immediately after a thyristor has been turned on and the gate signal has been removed.

Holding Current: It is the minimum anode current to maintain the thyristor in the on-state.

Latching current is always greater than holding current.

  • Thyristor can be triggered by increasing the forward voltage between anode and cathode, at forwarding break over voltage thyristor starts conducting
  • However, this process may damage the thyristor, so the thyristor is advised to trigger on through the gate pulse
  • When a gate signal is applied thyristor turns on before reaching the break over voltage
  • Forward voltage at which the thyristor triggers on depends on the magnitude of the gate current, the higher is the gate current lower is the forward break over voltage
  • Hence, for thyristor operation, The supply voltage must be less than the forward break overvoltage.
​

So, Option 2 is correct

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