The Current Source Inverter shown in the figure given below

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The Current Source Inverter shown in the figure given below is operated by alternately turning on thyristor pairs (T₁, T₂) and (T₃, T₄). If load is purely resistive, then theoretical maximum output frequency obtainable will be

1. 125 kHz
2. 250 kHz
3. 500 kHz
4. 50 kHz

Correct Option: C

Let T₃ and T₄ already conducting at t = 0
Now, trigger T₁ and T₂, so T₃, T₄ force commutated.

Now capacitor start to discharge, becomes zero. Now charge with opposite polarity

At t =	T	, trigger T₃, T₄
	2

So T₂, T₁ force commutated.
Now capacitor start to discharge, becomes zero and now charge with positive polarity
This completes one cycle

Time constant, = τ = RC = 0.5μs
∴ Total τ = 4 × τ = 4 × 0.5 μs = 2 μs

∴ f =	1	=	1	= 500 kHz
	T		2 × 10^-6