Power electronics and drives miscellaneous
- A chopper is employed to charge a battery as shown in the given figure. The charging current is 5 A. The duty ratio is 0.2. The chopper output voltage is also shown in the figure. The peak to peak ripple current in the charging current is ______ A
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During TON, V– t area across L is
= L (I mx – Imn) = L∆I
and, V – t area applied to L = (60 – E) TON = 48 TON
Equating the volt-area, we have∆I = 48 TON = 48 × 0.22 × 10-3 = 0.48 A L 20 × 10-3 Correct Option: A
During TON, V– t area across L is
= L (I mx – Imn) = L∆I
and, V – t area applied to L = (60 – E) TON = 48 TON
Equating the volt-area, we have∆I = 48 TON = 48 × 0.22 × 10-3 = 0.48 A L 20 × 10-3
- Below figure shows a chopper operating from a 100 V dc input. The duty ratio of the main switch S is 0.8. The load is sufficiently inductive so that the load current is ripple free. The average current through the diode D under steady state is ______ A
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NA
Correct Option: D
NA
- A 3-phase full converter has an average output voltage of 200 V for zero degree firing angle and for resistive load. For a firing angle of 90°, the output voltage would be ______V
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Vo = 3 Vmc cos α n
For α = 90° , Vo = 0VCorrect Option: A
Vo = 3 Vmc cos α n
For α = 90° , Vo = 0V
- A six pulse thyristor rectifier bridge is connected t o a balanced 50 Hz, three phase ac source. Assuming that the dc output current of the rectifier is constant, the lowest frequency harmonic component in the ac source line current is ______ Hz
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NA
Correct Option: B
NA
- In the single phase diode bridge rectifier shown in the given figure, the load resistor is R = 50 Ω; source voltage is v = 200 sinωt, where ω2π × 50 radians per second. The power dissipated in the load resistor R is ______ W.
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NA
Correct Option: C
NA
