Due Date: 06/01/2019 Assessment Title: Programme Title: Course No.: Course Title: Student Name: Student ID: Tutor: Do not write below this line. For Polytechnic use only. Assessor: Date of Marking: Grade/Mark: /100 Comments: By submitting this assessment for marking, either electronically or as hard copy, I confirm the following: ➢ This assignment is my own work ➢ Any information used has been properly referenced. ➢ I understand that a copy of my work may be used for moderation. ➢ I have kept a copy of this assignment Project Project Bachelor Engineering Technology EN7061 Analog Electronics Circuits Aqeel Mohamed 201702149 David Krause Date submitted: 06/01/2019 Assessment Cover Sheet
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Due Date: 06/01/2019
Assessment Title:
Programme Title:
Course No.:
Course Title:
Student Name:
Student ID:
Tutor:
Do not write below this line. For Polytechnic use only.
Assessor: Date of Marking:
Grade/Mark: /100
Comments:
By submitting this assessment for marking, either electronically or as hard copy, I confirm the
following:
➢ This assignment is my own work ➢ Any information used has been properly referenced. ➢ I understand that a copy of my work may be used for moderation. ➢ I have kept a copy of this assignment
Project
Project
Bachelor Engineering Technology
EN7061
Analog Electronics Circuits
Aqeel Mohamed
201702149
David Krause
Date submitted: 06/01/2019
Assessment Cover Sheet
ii
ABSTRACT
The aim of this report is to design, simulate, build and test a simple 6.8v – 200mA DC power
supply from an AC supply. The design went through four different stages: full wave
rectification, smoothing, ripple reduction and voltage regulation. Firstly, the necessary
parameters were calculated to complete the design. Then, these parameters were
simulated in Altium Designer. Finally, the circuit was constructed on a breadboard and
soldered into a vero board.
iii
Table of Contents
ABSTRACT ............................................................................................................................. ii
TABLE OF FIGURES .............................................................................................................. iv
TABLE OF TABLES ................................................................................................................ iv
Analyzing the deviation percentages between the calculated and simulated values, it can be
said that these percentages are almost in range and acceptable (0.44% - 11.11%). The 11%
deviation was for Vripple at third stage while other values have an error less than 5%. As the
same calculated values were used in the simulation, the deviation percentages were
expected to be in range. This shows that the simulation is consistent with the theory.
Turning on to the deviation percentages between the calculated and experimental values, it
is evident that there are some high percentages of error in this part (1.43% - 22.22%) where
higher deviation percentages where found for Vripple in stages 3 and 4. This could be due to
various reasons. The used components are not as well as the calculated values due to the
lack of some values. Additionally, these components have tolerances. These tolerances
affect the measured values as they obtain an unfixed value. Furthermore, human error in
recording measurements is considered an error factor too. For instance, several taken
measurements where floating between ±1 volt.
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8.0 CONCLUSION
A 230v/12v step down low voltage power transformer was used to successfully design 6.8
volts – 200 mA DC power supply through four stages. Firstly, four diodes were used to
design the full wave bridge rectifier stage. Next, a 200 µF capacitor was placed to gain a
ripple of approximately 6 volts. Then, a 1111 µF was used to reduce the ripple by
approximately 70% (1.8 volts). Finally, a 6.8v Zener diode was placed to regulate the output
voltage to the required voltage 6.8v.
This design was simulated using Altium Designer then constructed on a breadboard and a
vero board. There were some error percentages (0.22 % - 22.22 %) found between obtained
values due to the component’s tolerances and human error. Nevertheless, the aims of this
project have been fulfilled and accomplished.
20
REFERENCES
[1] Razak, I. (2016, September). A Design of Single Phase Bridge Full-wave Rectifier. Retrieved from https://www.researchgate.net/publication/308788220_A_Design _of_Single_Phase_Bridge_Full-wave_Rectifier
[2] Admin. (2018, December 13). Rectifier - Half wave rectifier and Full wave rectifier. Retrieved from https://mechatrofice.com/circuits/rectifier-half-wave-full-wave
[3] Shaik, A. (n.d.). Full wave rectifier. Retrieved from https://www.physics-and-radio- electronics.com/electronic-devices-and-circuits/rectifier/fullwaverectifier.html
[4] Full Wave Rectifier and Bridge Rectifier Theory. (2018, February 24). Retrieved from https://www.electronics-tutorials.ws/diode/diode_6.html
[5] National Semiconductor Voltage Regulator Handbook 1980: National Semiconductor Corporation (n.d.). Retrieved from https://archive.org/details/NationalSemiconductor VoltageRegulatorHandbook1980/page/n77
[6] Jojo. (2018, July 31). Full Wave Rectifier-Bridge Rectifier-Circuit Diagram with Design & Theory. Retrieved from http://www.circuitstoday.com/full-wave-bridge-rectifier