A DC chopper has 225 volts as input and the output required is 425 volts. If the non-conducting time of thyristor is 225 micro seconds, compute. i) Chopping frequency. ii) If the pulse width is (1/5)th of that in case (i) for constant frequency of operation, find the new output voltage. iii) If the frequency is increased 25% of that in case (i) keeping the conducting time constant, what is the new value of k and output voltage of the chopper.

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A DC chopper has 225 volts as input and the output required is 425 volts. If the non-conducting time of thyristor is 225 micro seconds,
compute.
i) Chopping frequency.
ii) If the pulse width is (1/5)th of that in case (i) for constant frequency of operation, find the new output voltage.
iii) If the frequency is increased 25% of that in case (i) keeping the conducting time constant, what is the new value of k and output
voltage of the chopper.
Transcribed Image Text:A DC chopper has 225 volts as input and the output required is 425 volts. If the non-conducting time of thyristor is 225 micro seconds, compute. i) Chopping frequency. ii) If the pulse width is (1/5)th of that in case (i) for constant frequency of operation, find the new output voltage. iii) If the frequency is increased 25% of that in case (i) keeping the conducting time constant, what is the new value of k and output voltage of the chopper.
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