1. Thought of the Day Soon or late, the man who wins is the man
WHO THINKS HE CAN !
रविवार, 7 अप्रैल 2019
Rectifiers

2. Diode Rectifiers
D.C. Kulshreshtha

3. Block Diagram of DC Power Supply
रविवार, 7 अप्रैल 2019
Rectifiers

4. Diodes in Rectifier Circuits
रविवार, 7 अप्रैल 2019
Rectifiers

5. Half-wave Rectifier
रविवार, 7 अप्रैल 2019
Rectifiers

6. रविवार, 7 अप्रैल 2019
Rectifiers

7. रविवार, 7 अप्रैल 2019
Rectifiers

8. Full-wave Rectifier (Centre-tap)
रविवार, 7 अप्रैल 2019
Rectifiers

9. Full-wave Rectifier (Bridge)
रविवार, 7 अप्रैल 2019
Rectifiers

10. रविवार, 7 अप्रैल 2019
Rectifiers

11. Diode Ratings Current Handling Capacity.
Peak Inverse Voltage (PIV ): It is the largest reverse voltage that is expected to appear across the diode. Usually, diodes are selected which have VZ at least 50 % greater than PIV.
रविवार, 7 अप्रैल 2019
Rectifiers

12. Determine the PIV for half-wave rectifier.
PIV Ratings
For full-wave rectifier :
Determine the PIV for half-wave rectifier.
रविवार, 7 अप्रैल 2019
Rectifiers

13. रविवार, 7 अप्रैल 2019
Rectifiers

14. Figures of Merit of a Rectifier
1. Ripple Factor (r) :
2. Rectification Efficiency (η) :
रविवार, 7 अप्रैल 2019
Rectifiers

15. Performance of Half-wave Rectifier
रविवार, 7 अप्रैल 2019
Rectifiers

16. Total RMS Value :
रविवार, 7 अप्रैल 2019
Rectifiers

17. RMS Value of AC Components :
रविवार, 7 अप्रैल 2019
Rectifiers

18. Note that this is a general result. Now, for Half-wave Rectifier :
रविवार, 7 अप्रैल 2019
Rectifiers

19. Performance of Full-wave Rectifier
How much is its period in terms of ωt ?
Its period is , and not 2.
रविवार, 7 अप्रैल 2019
Rectifiers

20. रविवार, 7 अप्रैल 2019
Rectifiers

21. Total RMS Value :
रविवार, 7 अप्रैल 2019
Rectifiers

22. Ripple Factor :
रविवार, 7 अप्रैल 2019
Rectifiers

23. Rectification Efficiency :
रविवार, 7 अप्रैल 2019
Rectifiers

24. रविवार, 7 अप्रैल 2019
Rectifiers

25. रविवार, 7 अप्रैल 2019
Rectifiers

26. रविवार, 7 अप्रैल 2019
Rectifiers

27. रविवार, 7 अप्रैल 2019
Rectifiers

28. रविवार, 7 अप्रैल 2019
Rectifiers

29. Filter Circuits
The output of a rectifier is not purely dc. It also has some ac components, called ripples.
The ripples are maximum in half-wave rectifier, and are less in full-wave rectifier
Filter circuit converts pulsating output of a rectifier into a steady dc level.
Filters simply smoothen out the ripples.
रविवार, 7 अप्रैल 2019
Rectifiers

30. There are two ways to do it :
Ripples are bypassed around a the load by using a shunt capacitor.
Ripples can be limited to a low value by a series inductor.
A filter circuit is generally a combination of capacitors and inductors.
रविवार, 7 अप्रैल 2019
Rectifiers

31. Filtering action depends upon the fact that:
Capacitor allows ac only to pass.
Inductor allow dc only to pass.
रविवार, 7 अप्रैल 2019
Rectifiers

32. Shunt Capacitor Filter
रविवार, 7 अप्रैल 2019
Rectifiers

33. Operation of Capacitor Filter
During the conduction period, the capacitor gets charged and stores energy.
During the non-conduction period, the capacitor discharges through the load resistance delivering energy to it.
Capacitor gets charged to the peak value quickly because charging time constant is almost zero.
रविवार, 7 अप्रैल 2019
Rectifiers

34. Discharging time constant is quite large, because it discharges through the load resistance.
As XC << RL, the ripples are bypassed through the capacitor and only dc component flows through the load resistance.
रविवार, 7 अप्रैल 2019
Rectifiers

35. रविवार, 7 अप्रैल 2019
Rectifiers

36. Obviously, a large-value capacitor should be preferred.
Any disadvantage ?
Ans . : Yes. Diode may get damaged.
How does the ripple factor vary with increase in the load current ?
Ans. : Increases.
रविवार, 7 अप्रैल 2019
Rectifiers

37. Review Idc , Irms , I’rms , r , η Figures of Merit of a Rectifier :
Ripple Factor.
Rectification Efficiency.
Performance of Half-wave Rectifier.
Idc , Irms , I’rms , r , η
Performance of Full-wave Rectifier.
Filters.
Block Diagram of DC Power Supply.
Half-wave Rectifier.
Full-wave Rectifier (Centre-tap).
Full-wave Rectifier (Bridge).
Diode Ratings.
Current Handling Capacity.
PIV Ratings.
रविवार, 7 अप्रैल 2019
Rectifiers