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) I_Latching < I_holding

(iv) I_Latching > I_holding

Which of the above statements are correct?

Choose the correct answer from the code given below:

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