Question

5. Sketch the DC voltage pattern you expect to see across the resistive load following a rectifying bridge. 6. What are the advantages and disadvantages of a rectifying bridge? 7. What can be done to "smooth out" the voltage from a rectifying bridge. Discuss the physics behind why these methods work.

Answer 1

Ans:5) DE DC outpect looks like shown below.

Ans:6) Advantages: i Bridge sectifier does not require a special centre tapped transformer, thereby reducing it's size and cost. 2) The peak inverse voltage is one half that of centre -tap rectifier. Hence bridge rectifier is highly suited for high voltage applications: Dis advantages: 1) I requires four semiconducting diodes

2) Two diodes in series conduct at a time on alternate half cycles. This creates a problem When low DC voltages are required. This decides to pesos voltage segulation. | Alls: 7) To smooth out" the voltage from a sectifyia ing bridge we use a capacito D2 DI DA BRL

the In this design, the positive pulse at the input causes the capacitor to charge through the diodes D, and B. However as negative pulse arrives at the input, the changing action of the capacitor ceases and it stasts to discharge viaki. This results in the generation of be output which will have ripple as compared to the case a low when there was no - capacita