thyristor operating from
1. A thyristor operating from a peak supply voltage of 400 V has the following
specifications:
Repetitive peak current, Ip = 200 A, = 50 A/µs, = 200 V/ µs. Choosing a factor safety for
the above-mentioned parameters, design a suitable snubber circuit. The minimum value
of load resistance is 10 Ω.
2. A boost converter with vin = 12 V is required to be designed for a 100 W rating. If the
output voltage is maintained at 96 V, find out load resistance and duty ratio. Further
design the filter components in consideration with a ripple of 10% and 5% in input
current and output voltage. Take the switching frequency be 30 kHz.
3. Following are the specifications of a thyristor operating from a peak voltage supply of
500 V: Repetitive peak current, Ip = 250 A, = 60 A/µs, = 200 V/µs. Take the factor of
safety of 2 for the three specifications mentioned above. Design a suitable snubber circuit
if the minimum load resistance is 20 Ω. Take ξ = 0.65.
4. A buck–boost converter operating at 20 kHz, L = 0.05 mH. The output capacitor C is
sufficiently high and Vd = 15 V. The output is to be regulated at 10 V and the converter is
supplying a load of 10 W. Calculate the duty ratio D.
5. A 230 V, 50 Hz, one pulse thyristor controlled converter is triggered at a firing angle of
40° and the load current extinguishes at an angle of 210°. Find the circuit turn-off time,
Average output voltage and average load current for R = 5 Ω, L = 2 mH and E = 110 V.
6. An RLE load is operating in a chopper circuit from a 500 V dc source. For the load, L =
0.06 H, R = 0 and constant E. For a duty cycle of 0.2, find the chopping frequency to
limit the amplitude of load current execution to 10 A.
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