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Q#1 Chopper GATE EE 2001 MSQ +2 marks -0 marks

A voltage commutated thyristor chopper circuit is shown in figure.  The chopper is operated at 500 Hz with 50% duty ratio.  The load takes a constant current of 20A.

(a) Evaluate the circuit turn off time for the main thyristor .

(b) Calculate the value of inductor L, if the peak current through the main thyristor  is limited to 180% of the load current.

(c) Calculate the maximum instantaneous output voltage of the chopper.

 

 L=0.234mH

Maximum instantaneous voltage = 200V

Maximum instantaneous voltage = 400V

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