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Power electronics and drives miscellaneous

Power Electronics and Drives

  1. Figure (i) shows the circuit diagram of a chopper. The switch S in the circuit in Figure (i) is switched such that the voltage VD across the diode has the wave shape as shown in Figure (ii). The capacitance C is large so that the voltage across it is constant. If switch S and the diode are ideal, the peak to peak ripple (in A) in the inductor current is __________

    1. 0.25
    2. 25
    3. 2.5
    4. 12.5
Correct Option: C


Peak to peak ripple in inductor current in

∆I =
Vs - Vo
Tm
L

= 100 - 100 ×
0.05
× 0.05 × 10-3
0.1
1 × 10-3

= 50 × 0.05
⇒ ∆I = 2.5 A



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