# Diode Application in Rectifier Circuits

by tan9797tangmailcom (student)

﻿ELECTRICAL ENGINERING

LABORATORY 1

EEE230

EXPERIMENT 5

DIODE APPLICATION

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CONTENTS

Title

Page

Introduction/theory

PART A:3-4

PART B:9-10

Result

PART A:5-6

PART B:11-13

Discussion/Question

PART A:7-8

PART B:14

Conclusion

15

References

16

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PART A ; Rectifier circuit using diode

Introduction

In this experiment, we have learned about the applications of diode. First, we were revising the basic of equipments handling. Secondly. we were knew that one of the main component used in the making of rectifier circuits are diodes and there are three types of rectifier circuits Thirdly, we have been introduced to the function of a capacitor in a rectifier circuit. Lastly, we also have learned about how to build a simple diode clipping and diode clamping circuits

Theory

Usually we have three main type of rectifier it is a half-wave rectifier circuit, center tap full-wave rectifier circuit and full-wave bridge rectifier circuit.

Firstly about half-wave rectifier circuit, when diode was connect to source AC voltage supply, it will be alternately forward-biased, and then reverse-biased, during each cycle of the AC sine-wave. When a single diode is used in a rectifier circuit, current will flow through the circuit only during one-half of the input voltage cycle like in figure below. For this reason, this rectifier circuit is called a half-wave rectifier. The output of a half-wave rectifier circuit is pulsating DC.

http://nuclearpowertraining.tpub.com/h1011v1/img/h1011v1_104_1.jpg

Second is about center tap full-wave rectifier circuit is uses two diodes connected to the secondary of a center tapped transformer. The AC on each side of the center-tap is ½ of the total secondary voltage. Only one diode will be biased on at a time the prose to be center tap full-wave rectifier is like below.

Last is about full-wave bridge rectifier circuit, The Bridge is shown in the figure below. The circuit has four diodes connected to form a bridge. The ac input voltage is applied to the diagonally opposite ends of the bridge. The load resistance is connected between the other two ends of the bridge.

http://www.visionics.ee/curriculum/Experiments/Bridge%20Rectifier/Images/Image79.gif

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RESULT PART A

Experiment 5.1

Without capacitor With capacitor

Experiment 5.2

Without capacitor With capacitor

Experiment 5.3

Without capacitor with capacitor

Input

Output

dc output voltage

(without capacitor)

Ripple voltage

(with capacitor)

Half-wave rectifier

6.60V

0.80V

Center tap full-wave rectifier

5.56V

0.38V

Full-wave bridge rectifier

5.52V

o.43V

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DISCUSSION

Based on the experiment above, on the first positive half cycle the diode conducts charging the capacitor left. This is on the right end, the right end of the capacitor with respect to the ground. It ...