Download presentation
Presentation is loading. Please wait.
Published byGilbert Morris Modified over 6 years ago
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
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.