12V Fixed Power Supply Design and Implementation Report

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Contents
Introduction................................................................................................................................2
LO1............................................................................................................................................3
P1............................................................................................................................................3
P2............................................................................................................................................5
M1..........................................................................................................................................6
LO2............................................................................................................................................7
P3............................................................................................................................................7
M2..........................................................................................................................................8
LO3............................................................................................................................................9
P4............................................................................................................................................9
M3........................................................................................................................................16
LO4..........................................................................................................................................17
P5..........................................................................................................................................17
M4........................................................................................................................................20
Conclusion................................................................................................................................21
References................................................................................................................................22
List of Figures
Figure 1: Block Diagram............................................................................................................4
Figure 2: Gantt chart..................................................................................................................7
Figure 3: Slide 1.......................................................................................................................17
Figure 4: Slide 2.......................................................................................................................17
Figure 5: Slide 3.......................................................................................................................18
Figure 6: Slide 4.......................................................................................................................18
Figure 7: Slide 5.......................................................................................................................19
Figure 8: Slide 6.......................................................................................................................19
Figure 9: Slide 7.......................................................................................................................19
Figure 10: Slide 8.....................................................................................................................20
Figure 11: Slide 9.....................................................................................................................20

Introduction
The below-created report is purely based on the topic named as 12 V Fixed Power Supply.
This report is mainly being created in order to develop or increase the skills for the
management of a particular type of of the project. The proper theme that is being in
associated with this project is The Professional Engineer’s Role in sustainable
Engineering”. The proper discussion related to the topic named Sustainable Engineering is
also shown in the report properly. Sustainable engineering is discussed or defined as the
technical design or the system in engineering’s field that assures that there would be no
compromise related to the future. Each and every project is needed to have the proper
sustainable disciple in order to create the proper design. There is a good discussion on the
topic named as Software development life cycle is given along with the various phases
related to them. Planning the project with proper management is must needed task in order to
make any of the project successful. The aim of the project is properly mentioned in the report
as it makes it clearer. Gantt chart along with the Log table is also created and pasted in the
report. The entire report is quite informative.

LO1
The first part of the report based on the topic 12 V Fixed Power Supply talks about the
selection point and it explains how and why the topic is selected. A proper plan of the
management is also being covered in this part. 12 V Fixed Power Supply is a topic that is
being selected.
P1
The topic 12 V Fixed Power Supply is being selected for this report and a proper explanation
of this topic is given in the report. The work of the topic being selected is that it helps in
designing, creating as well as testing the fix given Direct Current power supply that could
easily be used for testing the various other prototypes. There are various specifications of the
design are mentioned as it must be of low output ripple voltage and must also provide with
the stable output voltage. Power supplies are defined as a device that helps in delivering
electric power (Bakshi et al., 2015). The main work of the power supplies is to transfer the
current to the voltage. There are about four types of Power supply that are, Unregulated
Power supply, Ripple regulated, Linear-regulated and switching. The regulated Power supply
is mainly being used for the fixed output design. A large of applications of the Power supply
is mentioned below as:
 Used in Medical
 Used in Military
 Used in Telecommunication
 Networking applications
 Used in Power industries
 Used in laboratories for the testing purposes
Requirements of design
The requirement of the design is based on a condition that it must fulfill the requirement of
testing the various other prototypes. The design should be created in such a way that it must
contain the following features as:
 Should take 230 V AC and gives away the output voltage of +12 V DC
 The efficiency of the design must be of 75-85%.

 Regulation is of IC or the Zener diode.
 The temperature must be between -8 and 90 Celsius
 Ripple factor must be equal or less than the 300 mV.
 The dimension of the device must be 7 x 2 x 4 inch
For increasing the efficiency of the device, smoothing capacitor along with the ICs could be
used. For the main design to get created transistor along with the voltage regulator IC’s are
being used. Utilization of all the components must be done ineffectively as well as efficient
way. The three of the most important components of the Power supply are Transformer,
Rectifier as well as the Regulator.
Figure 1: Block Diagram
(Source: Electronic Circuits and Diagrams-Electronic Projects and Design, 2019)
After all the requirements are being met, three of the most important designs are extracted
and all these design solutions are delivered at the end. Various different software is being
used such as Eagle software, AutoCAD, Eagle PCB, and PCB way is used to order Hardware
PCB. The works of the transformers are shown that are mainly being used for converting the
step – down high AC to low AC levels. This is considered as one of the most important
elements for the designing of the power supply. For rectifying the AC to DC levels full-wave
rectifiers are being used. Smoothing capacitor along with the ICs could be used for
smoothening the ripples.
Design 1
The first of the three designs are being created by using the 220 ~ 15 V AC steps down
transformer. In order to convert or change the 15 V AC to 15 V DC, bridge rectifiers are
being used. As the fluctuations are being seen, in order to resolve this issue smoothing
capacitor is being used.
Design 2

In the second design, 5 A current is being used. Two of the transistors are being used for the
increment of the current. Transistors are mainly being used along with the resistors are
required for protecting all the transistors. Bias current is also provided to the circuit by the
help of the Resistors.
Design 3
In the two mentioned designs above, the desired voltage along with the current is being
achieved. But still there is the lack of smoothening of the regulations and therefore various
other methods are to be used for this purpose. LM338 IC is used in place of LM7812 in order
to get the ripple factor.
P2
Proper management of the project is required for achieving the final goal. Proper
management is done using the Software development Life cycle (Gupta et al., 2017). The
SDLC model consists of the various phases that are being mentioned below. The seven
different phases of Software development Life cycle model are:
Requirements: The first important phase of the Software development Life cycle model is
the Requirements phase. This phase mainly looks after the requirements of the project that
are to be completed in this phase. All the requirements must be selected in this phase and
following that the other phases are being implemented.
Planning: The second phase of the Software development Life cycle model is the Planning
phase. Planning is considered to be an important part of any of the project plans. Planning is
to be done once the requirements get finalized and this is being achieved in the first two
phases of the Software development Life cycle model.
Designing: The next phase to be discussed of the Software development Life cycle model is
the Designing phase. Designing phase is also one of the most important phases and this phase
has to be considered as the most serious phase because each and every aspect of the project is
to be covered here. Designing is done in this phase and designing the project is one of the
most important parts.
Implementation: The next phase after the designing phase is the implementation phase of
the Software development Life cycle model. Design is a type of prototype or the blueprint on

which the entire project is being implemented and this is to be done in the most effective as
well as efficient way. This phase is one of the most important phases and has not to be taken
for granted.
Testing: The next phase that is also one of the most important phases in the testing phase.
This phase explains the status of the phase and checks whether the work done is a proper way
or not. Test cases help in determining the work progress and provide the status of the work
and tell where the changes are needed to be made and how long the work is going to exist.
Maintenance: Maintenance is the next important phase after the implementation and
designing phases of Software development Life cycle model (Rastogi, V., 2015). This phase
helps in improving the quality of the project and also helps in providing or adding into the
project. Testing phase provides with the different number of issues that could easily be
resolved in this phase.
Deployment: The last and the final phase of the Software development Life cycle model is
the Deployment phase and this phase is the final step of the development of the project. The
deployment phase is the delivery of the project that is provided to the client after each and
every work in completed properly in a proper effective and efficient manner.
M1
The reasons behind selecting the project named as the 12 V Fixed Power Supply are
mentioned below as:
There are a lot of different applications that make it available for the selection. Such
application is that this protects could easily be used in Medical, Used in Military, Used in
Telecommunication, Networking applications, Used in Power industries as well as it could
also be used in Laboratories for the testing purposes. Not just the applications but also along
with it, there are a few numbers of other reasons that make its selection useful. The work of
the topic being selected is that it helps in designing, creating as well as testing the fix given
Direct Current power supply that could easily be used for testing the various other prototypes.
There are various specifications of the design are mentioned as it must be of low output ripple
voltage and must also provide with the stable output voltage. Power supplies are defined as a

device that helps in delivering electric power. The main work of the power supplies is to
transfer the current to the voltage.
LO2
This is the next part of the report which mainly helps in organizing or identifying the
different number of activities that are entirely involved in the creation as well as in the
completion of the project.
P3
Gantt chart is the main thing that is being used in this report for the creation of the proper
schedule of the project (Lohle, M.F., and Terrell, S.R., 2017). Gantt chart helps in showing
the entire project process along with the timings associated which each of the step and also
tells about the person who is associated to which particular task. The proper Gantt chart has
been created and shown below as:
ID Task
Mode
Task Name Duration Start Finish Predecessors
0 Fixed Power Supply45 days Tue 09-07-19Mon 09-09-19
1 1 Meeting with
stakeholder
4 days Tue
09-07-19
Fri 12-07-19
2 1.1 Presenting
project
2 days Tue
09-07-19
Wed
10-07-19
3 1.2 Porject Apporval2 days Thu 11-07-19Fri 12-07-19 2
4 1.3 Milestone 0 days Fri 12-07-19 Fri 12-07-19 3
5 2 Requirement
specification
9 days Mon
15-07-19
Thu
25-07-19
6 2.1 Power
Supply
Research
2 days Mon
15-07-19
Tue
16-07-19
4
7 2.2 Gathering
resources
3 days Wed
17-07-19
Fri 19-07-19 6
8 2.3 Evaluating
the resources
4 days Mon
22-07-19
Thu
25-07-19
7
9 2.4 Milestone 0 days Thu 25-07-19Thu 25-07-198
10 3 Design Specification7 days Fri 26-07-19 Mon 05-08-19
11 3.1 Design 1 2 days Fri 26-07-19 Mon 29-07-199
12 3.2 Design 2 3 days Tue 30-07-19Thu 01-08-1911
13 3.3 Design 3 2 days Fri 02-08-19 Mon 05-08-1912
14 3.4 Milestone 0 days Mon 05-08-19Mon 05-08-1913
15 4 Prototyping 2 days Tue 06-08-19Wed 07-08-19
16 4.1 Analyzing
prototype of
project
1 day Tue
06-08-19
Tue
06-08-19
14
12-07
25-07
05-08
09 12 15 18 21 24 27 30 02 05 08 11 14 17 20 23 26 29 01 04 07 10 13
July 2019 August 2019 September 2019
Figure 2: Gantt chart

M2
If the option of the Gantt chart is not being provided then there are a few numbers of different
alternative methods that could be used such as:
 Project Management Timeline.
 Project Network Diagram.
 Kanban Board.
 Cross-Functional Flowchart.
 Sprint Timeline.

LO3
P4
Log Table
Task Name Duration Description Start Finish
Fixed Power Supply 45 days
This is the project
that is being selected
for designing,
creating as well as
testing the fix given
Direct Current
power supply that
could easily be used
for testing the
various other
prototypes.
Tue 09-07-19 Mon 09-09-19
Meeting with
stakeholder 4 days
This is the first step
of the entire
management process
as it starts with a
meeting with the
stakeholders.
Tue 09-07-19 Fri 12-07-19
Presenting project 2 days
The next phase is the
representation of the
project and this
includes the proper
proposal.
Tue 09-07-19 Wed 10-07-19
Project Approval 2 days The project that is
being represented is
Thu 11-07-19 Fri 12-07-19

approved and the
work after the
approval is to be
started according to
the plans.
Milestone 0 days
The first Milestone
is being achieved
here properly. Fri 12-07-19 Fri 12-07-19
Requirement
specification 9 days
This is the next
milestone that is
needed to be
achieved; here the
proper requirements
are to be mentioned.
Mon 15-07-19 Thu 25-07-19
Power Supply Research 2 days
This is the research
process where the
research on the
entire project is to be
done properly in a
proper way.
Mon 15-07-19 Tue 16-07-19
Gathering resources 3 days
This is the next
phase of the second
milestone where all
the requirements that
were mentioned are
being gathered
properly.
Wed 17-07-19 Fri 19-07-19
Evaluating the 4 days The next and Mon 22-07-19 Thu 25-07-19

resources
important phase in
the evaluation of the
resources and this is
an important phase.
Milestone 0 days
The second
Milestone is being
achieved here
properly.
Thu 25-07-19 Thu 25-07-19
Design Specification 7 days
This is the next
milestone that is
needed to be
achieved and here
proper design
specification is
being made.
Fri 26-07-19 Mon 05-08-19
Design 1 2 days
Here, the first design
according to the
specifications is
being created.
Fri 26-07-19 Mon 29-07-19
Design 2 3 days
Here, the second
design according to
the specifications is
being created.
Tue 30-07-19 Thu 01-08-19
Design 3 2 days
Here, the third
design according to
the specifications is
being created.
Fri 02-08-19 Mon 05-08-19

Milestone 0 days
The next Milestone
is being achieved
here properly. Mon 05-08-19 Mon 05-08-19
Prototyping 2 days
This is the second
last milestone that is
needed to be
achieved and here
the prototype is to be
created.
Tue 06-08-19 Wed 07-08-19
Analyzing the
prototype of the project 1 day
The prototype that is
being created at the
first is not selected
directly but it is
needed to be
analyzed properly.
Tue 06-08-19 Tue 06-08-19
Evaluating the
prototype of the project 1 day
After the analyzation
of the prototype gets
completed.
Evaluation is the
most important part
to be achieved with
limited time.
Wed 07-08-19 Wed 07-08-19
Milestone 0 days
The third Milestone
is being achieved
here properly. Wed 07-08-19 Wed 07-08-19
Finalizing Design 9 days The next milestone
is finalizing the
entire design. The
Thu 08-08-19 Tue 20-08-19