Laboratory 10 - Intro to Diodes - Electrical circuits

EGR 2402-01        

December 6th, 2019

Lab Report 10

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1. Introduction

During this laboratory, we will get more familiar with the concepts involved with Diodes, and the circuits where they are put in action. Those components allow current to flow in one direction only. Unlike resistors, capacitors, or inductors, the inherent asymmetry of diodes requires that we distinguish between the two ends of the device. One end is called Anode, while the other is called Cathode. Diodes have marks on them so that one can differentiate the two terminals. We will therefore conduct analyses on different configurations that involve, i.e. a half-wave rectifier circuit, and a full-wave one.

1. Materials used

1. Experimentally:

Diodes

Breadboard

DMM

Resistors

Capacitor

Connecting wires

Function generator

1. Theoretically:

PSpice software

1. Theoretical Procedures

1. Theoretically:

We started by implementing the circuit using Pspice. This latter contains the following components: a 5V voltage source, a 1k ohms resistor, and a diode of type D1N4002. We performed a DC sweep analysis with a current varying from -15 to 1V with an increment of 0.1V. we afterwards plotted the current flowing through the resistor versus its voltage. The following figure shows the circuit implemented:

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Figure 1: Circuit on Pspice

After performing our Dc sweep analysis, we got the following graph:

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Figure 2: I through resistor vs. voltage through resistor

The second part of our analysis involved switching our Dc source to a Vsin one, with an amplitude of 10V and a frequency of 1khz. We performed a transient analysis on the circuit. We set the initial and final time in such a manner that we get 6 periods in our graph. The following graph shows Vsin and V through the resistor versus time.

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Figure 3: Vsin and Vr versus time

Th enext part of this analysis involved the implementation of a full-wave rectifier circuit. We implemented the following circuit using pspice, and conducted a transient analysis on it to plot Vin and vb versus time.

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Figure 4: full-wave rectifier circuit

We then added a capacitor in parallel with R1 and performed the same analysis with two values of its capacitance: 10μF and a 100μF.

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Figure 5: full-wave rectifier circuit with the capacitor

The graphs that we got are shown below:

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Figure 6: Vsin and Vd for a full-wave rectifier circuit

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Figure 7: Vsin and Vd for a full-wave rectifier circuit (after adding the capacitor with C=10μF)

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Figure 7: Vsin and Vd for a full-wave rectifier circuit (after adding the capacitor with C=100μF)

1. Experimentally:

The next methodology we followed in this laboratory is the experimental one, within which we used the breadboard to implement the circuit. We implemented all the configurations discussed before, and compared the graphs we get with the oscilloscope to the ones we got from Pspice. The following nfigure illustrates one of our configurations:

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