Explain the working of Class B commutation?
At t=0, the main thyristor / SCR is gated and turned on. Load current equal to I0 starts flowing through the main thyristor T1 and Load. Now, we want to turn this thyristor off. To do this, we fire the auxiliary thyristor TA at t=t1. Till time t=t1, the capacitor is charged with source voltage Vs i.e. vc = Vs, capacitor current ic = 0 and current through main thyristor T1 i.e. i0 = I0.
The current through TA is zero at t=t2 and if it gets reversed biased after t=t2 then TA will get turned off. The voltage across TA equals the voltage across capacitor.
When the magnitude of ic reaches I0, the current through the SCR T1 will become zero. This can be seen at t=t3. Main thyristor T1 will turn off at t=t3 as the current through it is zero and it is reversed biased after this instant of time.
How to Calculate Peak current Class B thyristor commutation?
Peak current Class B thyristor commutation calculator uses Peak Current = Source voltage*(sqrt(Capacitance/Inductance)) to calculate the Peak Current, The Peak current Class B thyristor commutation formula is defined as the maximum magnitude of the current across a thyristor when it is undergoing the process of commutation. Peak Current is denoted by I_{o} symbol.
How to calculate Peak current Class B thyristor commutation using this online calculator? To use this online calculator for Peak current Class B thyristor commutation, enter Source voltage (Vs), Capacitance (C) & Inductance (L) and hit the calculate button. Here is how the Peak current Class B thyristor commutation calculation can be explained with given input values -> 6.97137 = 9*(sqrt(3/5)).