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Power electronics and drives miscellaneous

Power Electronics and Drives

  1. In the voltage doubler circuit shown in the figure, the switch ‘S’ is closed at t = 0. Assuming diodes D1 and D2 to be ideal, load resistance to be infinite and initial capacitor voltages to be zero, the steady state voltage across capacitors C1 and C2 will be

    1. vc1 = 10V, vc2 = 5V
    2. vc1 = 10V, vc2 = – 5V
    3. vc1 = 5V, vc2 = 10V
    4. vc1 = 5V, vc2 = – 10V
Correct Option: C


First capacitor C1 will charge through diode D1 upto Vmax (5 V) with shown polarity
∴ VC1 = 5 V
Now, diode D1 will be reverse biased and D2 will be forward biased and capacitor C2 will charge in reverse direction through diode D2 upto 2Vmax
∴ VC2Hence, VC1 = 5 V1, VC2 = 10 V



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