Lab No 06 Full Wave Bridge Rectifier

7/24/2019 Lab No 06 Full Wave Bridge Rectifier

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1 | P a g e L a b 0 6 F u l l W a v e B r i d g e R e c t i f i e r

Information Technology

University

Department of Electrical Engineering

Electronic Devices and Circuits

Lab Manual 6

Full Wave Bridge Rectifier

Name Roll No.

Created by: Engr.Yasir Manzoor, Engr. ZafarullahDate: August 21, 2015

Last updated by: Engr.Yasir Manzoor, Engr.Zafarullah

Date: August 21, 2015

Reviewed By: Mr. Talha Rehmani

Approved by the HOD: Dr. Tauseef Tauqeer


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Department of Electrical Engineering

Electronic Devices and Circuits

Faculty Member

Name: Sir Talha Rehmani

Signature:________________________

Session

Lab Engineer 1

Name: Engr.Yasir Manzoor

Signature:________________________

Semester:

Lab Engineer 2

Name: Engr.Zafarullah

Signature:________________________

Date

Report Marks: _______ Out of _______ Viva Marks: _______Out of _________


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Contents

6 FULL WAVE BRIDGE RECTIFIER ................................................................................................................ 4

6.1 INTRODUCTION: ......................................................................................................................................... 4

6.2 OBJECTIVE ................................................................................................................................................. 4

6.3 EQUIPMENT ............................................................................................................................................... 4

6.4 CONDUCT OF LAB ....................................................................................................................................... 4

6.5 THEORY AND WORKING ............................................................................................................................... 4

6.6 PERFORMANCE PARAMETERS FOR TWO PULSE RECTIFIER ANALYSIS ...................................................................... 5

6.7 PROCEDURE: .............................................................................................................................................. 6

Without Filter ............................................................................................................................... 6

With Capacitor Filter .................................................................................................................... 9

6.8 TROUBLESHOOTING EXERCISE ...................................................................................................................... 10

Diode short circuited .................................................................................................................. 10

Diode open circuited ................................................................................................................... 11

Full wave bridge rectifier with function generator ..................................................................... 12

6.9 STUDENT LEARNING OUTCOME ................................................................................................................... 13

1

2

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6 Full Wave Bridge Rectifier

6.1Introduction:A rectifier is a circuit widely used in power supplies, converters and other electronic devices

where we need to reduce AC voltages to DC values. Full wave rectifier gives two cycle overcomplete input. Full wave rectifier is better in many aspects then half wave as it have double

average power, load handling capacity and less ripple factor.

6.2Objective1. To study basic parameters of full wave rectifier and their importance.

2. To implement full wave rectifier and study the input and output wave difference.

3. To observe effect of capacitor filter in full wave rectifier.

4. To calculate ripple factor graphically using oscilloscope.

5. To troubleshoot the bridge rectifier circuit.

6.3

Equipment1. Function Generator

2. Digital Multimeter

3. Oscilloscope

4. Transformer 220V to 12V

5. Diode 1N4007

6. Resistance 330 / 0.5W, 470, 680, 820, 1K, 2.2K, 3.3K, 4.7K, 6.8K, 10K,100K

7. Capacitance 0.1uF,1uF,2.2uF,10uF,47uF,56uF,68uF,100uF,220uF,330uF

8. Breadboard

9. Connecting wires

6.4

Conduct of Lab1. Students are required to perform this experiment using the equipment provided.

2. Students are required to work in a group specified by lab engineer.

3. In case some aspect of the lab experiment is not understood the students are advised

to seek help from the course instructor, lab engineers, assigned teaching assistants

(TA) and lab attendants.

6.5Theory and WorkingThe bridge rectifieruses four diodes connected as shown infigure 1. When the input cycle is

positive as infigure 1, diodes D1 and D2 are forward-biased and conduct current in the

direction shown. A voltage is developed across RLthat looks like the positive half of the input

cycle. During this time, diodes D3 and D4 are reverse-biased.


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Figure 1 full wave bridge rectifier during positive half cycle D1 and D2 conducts

When the input cycle is negative as infigure 2, diodes D3 and D4 are forward biased and

conduct current in the same direction through RL as during the positive half-cycle. During the

negative half-cycle, D1 and D2 are reverse-biased. A full-wave rectified output voltage appears

across RL as a result of this action.

Figure 2 full wave bridge rectifier during negative half cycle D3 and D4 conducts

6.6Performance Parameters for Two Pulse Rectifier AnalysisThe following parameters has been explained in the analysis of Half Wave Rectifier.

6.6.1.1 Peak I nverse Vol tage (PIV)

Peak Inverse Voltage (PIV) of half wave rectifier = VSMAX

6.6.1.2

Average Value of Output Voltages and Current

=1 sin()0 =2 = 6.6.1.3 Average Diode Current

ID= IDC2


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6.6.1.4 The rms Value of Output Voltages and Current

=1 (sin())

0 =2

Irm=Vrm

R

6.6.1.5The Load Average and rms Power

PDC= VDCIDC=4Vm2R2

Pac= VrmIrm= Vm2 R

6.6.1.6

Rectifier Efficiency = = 81%6.6.1.7Form Factor

FF = =1.116.6.1.8

Ripple Factor

RF =VACVDC=FF 1 = 48.2%6.6.1.9Power Absorbed By the Load Pload= IrmR6.7Procedure:

Without Filter1. Connect the circuit on bread board as perfigure 3.

2. Connect the primary of the transformer to main supply i.e. 230V, 50Hz

3. Starting from 330 vary the resistance up to 100K as mentioned in table 1.

4. Connect the Multimeter at output terminals note down the Vac and Vdc as per given

tabular form by varying resistance.

5. Disconnect load resistance and note down no load voltage Vdc (V no load)

6. Connect load resistance at 1K and connect Channel II of CRO at output terminals and

CHI of CRO at Secondary Input terminals observe and note down the input and output

wave form of output voltage (VO)Output current(Io), diode 1 voltage (VD1), diode 3 voltage

(VD3)and source current (IS)on graph sheet.7. Calculate ripple factor

Equation 1 Ripple factor


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8. Calculate Percentage of Regulation

Equation 2 Percentage Regulation

Figure 3 Full wave rectifier without filter

No Load voltage_________________

Sr.NoLoad Resistance

Output VoltageRipple Factor

% Of VoltageRegulation 100Vac Vdc

1 330 / 0.5 W2 470

3 680

4 820

5 1 K

6 3.3 K

7 4.7 K

8 6.8 K

9 10 K10 100 K

Table 1 Observation for full wave rectifier without filter


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With Capacitor Filter

1.

Connect the circuit as infigure 4 and vary the capacitor.

2. Connect oscilloscope at output to observe the change in ripple of output wave.

3.

Using oscilloscope measure average value (Vdc) of output waveform.4. Using oscilloscope observe and calculate Vac of output ripple according to table 4.

5. Calculate ripple factor using equation and fill the table 4given below.

S.No C

Output Voltage RippleFactorVr(max) Vr(min) Vr(p-p)=Vr(max)-Vr(min) =

( )/22 Vdc

1 0.1uF

2 1uF

3 2.2uF

4 10uF

5 47uF

6 56uF

7 68uF

8 100uF

9 220uF

10 330uF

Table 2 Full wave rectifier using different filtering capacitor

.

Figure 4 Full wave rectifier with capacitor filter


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Figure 5 Model wave forms for full wave rectifier

6.8Troubleshooting ExerciseConnect the circuit as infigure 3 observe the behavior of output waveform in following cases.

Diode short circuited

6.8.1.1

D1 Short Circuited

Short the D1using jumper wire and draw the output wave form obtained on oscilloscope.

Write reason for distorted waveform.

Reason:

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6.8.1.2 D3 short circuited

Short the D3using jumper wire and draw the output wave form obtained on oscilloscope.

Write reason for distorted waveform.


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Reason:

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Diode open circuited

6.8.2.1 D1 open circuited

Open the D1 and draw the output wave form obtained on oscilloscope. Write reason for

distorted waveform.

Reason:

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6.8.2.2

D4 open circuited

Open the D4 and draw the output wave form obtained on oscilloscope. Write reason fordistorted waveform.

Reason:

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Full wave bridge rectifier with function generator1. Connect the circuit as shown infigure 5.

2. Generate10V(p-p) sine wave using function generator.

3. Observe and draw the output wave form.

4.

Give reasons for distorted output waveform.

Figure 5 Bridge rectifier with function generator

Reasons:

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6.9Student Learning Outcome

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Lab No 06 Full Wave Bridge Rectifier

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