Thyristor Ratings Questions and Answers

The finger voltage of an SCR is

The thermal resistance between junction & the SCR (θjc) has the unit

An SCR has half cycle surge current rating of 3000 A for 50 Hz. Calculate its one-cycle surge current rating

Which among the following anode current waveforms will have the minimum junction temperature?

For a SCR the maximum rms on-state current is 35 A. If the SCR is used in a resistive circuit for a rectangular wave with conduction angle of 90°. Calculate the average & rms currents respectively.

The amp²-sec rating of the SCR specifies

The maximum rms current of an SCR is 50 A. For a 120° sine wave conduction the form factor (FF) = 1.878
Find the average on-state current rating (ITAV).

The forward dv/dt rating of an SCR

The voltage safety factor (V_SF) for an SCR is the ratio of

For an SCR the average & rms values of current are I/4 & I/2 respectively. Calculate the average on-state current rating (ITAV). Take maximum RMS on-state current = 35 A.