Ripple Factor

Q1. Draw the block diagram of an adapter (also called “Regulated Power Supply”) and explain the function of each block. Explain briefly with proper sketches, how the diodes form the integral part of the adapter design.  (10 marks)
Q2. With the help of a neat circuit diagram explain the operation of a Bridge Rectifier. Also define PIV and find PIV for HWR, Center tapped FWR and Bridge Rectifier. You are expected to cover:
(i) Ckt diagram of Bridge-FWR,
(ii) Ckts showing current conduction path through Load during +ve and –ve half cycles of i v
(iii) Input [i& v] and Output voltage waveforms,
(iv) comment on Vdc and rms v (derivation not needed: write the formulae and give the values),
(v) comment on ripple factor (derivation not needed: write the formula and give the value),
(vi) comment on rectification efficiency (write the formula and give the value),
(vii) Ckt diagram of HWR, center-tapped FWR and find PIV in all three cases and comment on PIV values.  (20 marks)
Q3. Compare the performance of HWR, Center-tapped FWR and Bridge Rectifier. Mention the advantages and disadvantages of Center-tapped FWR and Bridge rectifiers. You are expected to compare them based on parameters
(i) Number of diodes required,
(ii) Vdc ,
(iii) vrms ,
(iv) ripple factor,
(v) max.rectification efficiency,
(vi) PIV of diodes,
(vii) ripple frequency
and (viii) other parameters, if any
(20 marks

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