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Thought of the Day Soon or late, the man who wins is the man

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Presentation on theme: "Thought of the Day Soon or late, the man who wins is the man"— Presentation transcript:

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


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