Lab report for cse 251

Lab Report: CSE 251 East West University

Lab Report for CSE 251East West University

Lab Experiment Number: 01

Experiment TITLE:Half-Wave Diode Rectifier Circuit

Prepared by:

Student Name: Samia Bari

Student ID: 2011-3-60-027

Date of Experiment: 02-02-2014

Date of Report: 16-02-2014

Course Title:Electronic Circuits

Instructor Name:Fahmida Azmi

Group Information

Group Number: 05Name of Student 2: Fatema Tuz Zohora

ID: 2011-3-60-010Name of Student 3: Asadujjaman Shohan

ID: 2011-3-60-017

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ABSTRACT

In experiment no.02 we have learned the characteristics of Half-Wave rectifier circuit & how a capacitor works in a circuit. A rectifier circuit converts an AC voltage with zero average into a unidirectional voltage with a non-zero average. The rectifier circuit can rectify both positive & negative half- cycles or only the positive half- cycle of a sine wave. A capacitor connected across the load resistor acts as filter& reduces the ripple of the output voltage. The time constant of the RC network should be much larger than the period of the AC source voltage for effective filtering. In the experiment 1st we have to measure the resistance, built the circuit setup a voltage from the signal generator & give input to the circuit & observe output in channel-2. Measure the difference in peak values between input & output values. After connecting capacitor to the parallel of the resistor we observed the output, measured the time during diode conducts & peak to peak ripple voltage. At last we found our average of output voltage. Here for the capacitor the output voltage changes.

KEYWORDS:

1. Diode

2. Rectifier

3. Ripple voltage

4. Capacitor

5. Peak to peak voltage

6.

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TABLE OF CONTENTSPage

Abstract....................................................................................................2

Keywords:................................................................................................2

TABLE OF CONTENTS.......................................................................3

LIST OF TABLES..................................................................................3

LIST OF ILLUSTRATIONS.................................................................3

Introduction.............................................................................................4

Theory......................................................................................................4

Pre-Work Data and Results...................................................................4

Lab Handout Questions..........................................................................4

Equipments used.....................................................................................4

PROCEDURE.........................................................................................4

Results......................................................................................................4

Conclusion...............................................................................................5

References................................................................................................5

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INTRODUCTION

The experiment is about half wave rectifier circuit. Here as the rectifier circuit can rectify both positive & negative signal & capacitor works as a filter so that the input voltage changes & gives us a new voltage. Here we can study,

1. How a rectifier circuit works.2. The effect of capacitor filter on the output of the rectifier circuit.

We can relate this experiment with real world well enough. Now a days we are using many electronic objects which have diode, rectifier, capacitor. So as we learned how this things works if there occurs any problem in those devices we can solve them.

THEORY

Here we have used,

1. Vr = Vp/(fCR)……….(i)

2. ω∆t = cos(−1) ((Vp−Vr)/Vp)……..(ii)

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LAB HANDOUT QUESTIONS

ANSWER-1: Comparison between measured ∆Vp with the built in voltage:

Measured value of ∆Vp Built in voltage 2.32V 0.5V

ANSWER-2:

Comparison between measured ∆t with pre-lab value:

Measured value of ∆t Pre-lab value of ∆t0.168 X 10-3 sec 4.1129 X 10-3 sec

Peak to Peak ripple voltage:

ω∆t =√2VrVp

(ω∆t)2 = 2VrVp

2Vr = (ω∆t)2 * Vp

Vr = (ω∆t ) 2∗Vp

2 =

(0.451 )2∗52

= 0.508V

Calculated value of Vr Measured Value of Vr Pre-Lab value of Vr

0.508V 0.288V 0.5V

ANSWER-4:

Average output:

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Vo = Vp - Vr2

= 5 – 0.52

= 4.75

Calculated Value of V0 Measured Value of V04.75V 3.12V

ANSWER-5:

Average and Maximum Diode Current:

IL = VoR =

4.751 = 4.75 mA

IDavg = IL (1+π √ 2VpVr ) = 4.75 (1+π √ 2∗5

0.5 ) = 71.50 mA

IDmax = IL (1+2 π √2VpVr )= 4.75 (1+2 π √

2∗50.5 )

= 138.20 mA

IDavg = IL (1+π √ 2VpVr ) = 4.75 (1+π √ 2∗5

0.288 ) = 92.682 mA

IDmax = IL (1+2 π √2VpVr )= 4.75 (1+2 π √

2∗50.288 )

= 180.614 mA

Calculated Values Pre-Lab ValuesIL 4.75 mA

IDavg 98.682 mA 71.50 mAIDmax 180.614 mA 138.20 mA

ANSWER-6:

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Input & Output plots

Fig : Figure of input output plot.

EQUIPMENTS USED

We have used,

1. signal generator 2. digital multi meter3. capacitor4. resistance5. diode

PROCEDURE

1st we measured the resistance , setup the circuit. Then set the sine wave signal & give input to gthe circuit & observed output. We measured ripple voltage, peak voltage, time during the diode conducts & average output voltage.

RESULTS

Calculated Values Pre-Lab Values

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IL 4.75 mAIDavg 98.682 mA 71.50 mAIDmax 180.614 mA 138.20 mA

INPUT & OUTPUT PLOTS

Fig : Figure of input output plot.

CONCLUSION

In case of measured ∆t here are some difference between Ideal value and measured value because in lab temperature and some problem effect on the measured value. Here capacitor works as a filter so that

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REFERENCES

(List atleast 2 references, where the topic of the material that you cover in your experiment is mentioned and explained. Example of how a reference is written. “F.T. Ulaby, Fundamentals of Applied Electromagnetics, Chapter 2.1, Prentice Hall, 2004” Anything that someone else thought/designed/wrote/drew/talked about. Better to over-reference than under-reference. Give credit where credit is due, or even where it just might be due.)

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Lab report for cse 251

Engineering

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