Full Bridge Inverter Design Project: Aircraft Lighting Application

This document presents a project solution for a single-phase full bridge inverter, focusing on its design, simulation, and analysis. The project outlines the characteristics, objectives, and responsibilities involved in creating a functional inverter, particularly for applications like aircraft lighting systems. It details the use of Multisim software for simulation, the implementation of a PWM control scheme, and the selection of appropriate components to achieve the desired AC output from a DC input. The project also addresses challenges encountered during the design process, such as switch configuration and thyristor implementation, and proposes solutions to overcome these issues. The project review highlights the successful completion of the inverter design and the contributions made by the team member, emphasizing the practical application of electronics knowledge and skills. This project solution also considers team collaboration for the design and builds on previous research and experiments to create an innovative and effective inverter design.

CE 2.1 Project Information
Name of the project: Single Phase Full Bridge Inverter
Location of the project: Please fill
Project Duration: Please fill
Organization: Please fill
Role and Designation during the time: Team Member of the project
CE 2.2 Project Background
CE 2.2.1 Characteristics of the project
The single phase bridge DC to AC inverter could be properly designed only after
considering few assumptions and conventions. This single phase full bridge inverter is
responsible for producing the square-shaped output voltages for a single-phase load. While
executing this project, I provided a better performance of a single phase full bridge inverter
with the resistive load. I used Multisim software for simulating and improving the power
inverter device. Moreover, I have used the duty-cycle based configurations of LM555 timer
for generating the AC outputs of 50Hz. Two distinct BJT transistors of NPN and PNP were
also utilized for converting the 12 V DC to 24 AC cycle. I selected a low-pass filter for
testing and transforming distorted square wave into pure sinusoidal wave. Therefore, I have
executed the project with proper standards by providing a complete design of single phase
full bridge inverter.

CE 2.2.2 Objectives developed for the project
The single phase full bridge inverter is the significant electronic device that
transforms the DC to AC. I had to follow a set of standards for getting the perfect and desired
outcome. There were a couple of activities that were required to be executed properly. I have
used single phase uncontrolled rectifiers for a number of power electronic based converters. I
wanted to improve the inherent limitations of a power inverter and therefore, in order to
complete my project and generating power by designing a single phase full bridge inverter, I
have developed the following objectives:
 To propose the design of a single-phase full bridge inverter with all necessary
components as well as items.
 To improve or remove the inherent limitations of a power inverter.
 To utilize the software of Multisim for simulating and improving the power inverter
device.
 To use effective ways for estimating the drop in voltage within the circuitry with the
facility design.
 To have familiarity with DC to AC inverter design and single phase half bridge
inverter.
CE 2.2.3 My area of work
I was appointed as the chief electronics and communication engineer in this project. I
had experience in the field work due to my previous involvement in few projects and this I
had the core responsibility of designing the entire single phase full bridge inverter. I was
responsible for identifying the components required to design this inverter and provider
proper guidance to my team leader and head of the departments. Being, the chief electronics
and communication engineer, I was supposed to make the circuit diagram and even

implement the circuit. Moreover, I had submitted weekly progress reports to my project
leader and head of the department.
CE 2.2.4 Project Group
Figure 1: People involved in the project
CE 2.2.5 My responsibilities throughout the project
In the project of Single Phase Full Bridge Inverter, I was assigned for proposing a
compact design for the single-phase full bridge inverter. For this purpose, I had to use the
various non linear control techniques, which are used in the pulse width modulation inverters.
I had to ensure that the sliding mode control offers robustness against external disturbances
and parameter variations. Moreover, I even used my intellect for solving the issues faced in
this project. My other responsibility was to use Multisim software for implementing the
circuit of this single-phase full bridge inverter properly. I also had to consider the full-bridge
voltage source inverters with the resistive load. The circuit was being operated by simply
switching 4 switches, S1, S2, S3 as well as S4 and these four switches were switched on and

off at the 50% duty-cycle. To complete this project, I even had to compare the output of the
DC to AC converter with my desired output.
CE 2.3 Distinctive Activity
CE 2.3.1 Comprehending the Theory of Project
I have made the power circuit diagram of the single phase full bridge inverter. When
T1 - T2 were linked, the respective input voltage Vd appeared across this load. When I linked
T3 - T4, this particular voltage was –Vd. This circuit was eventually operated by properly
switching S1, S2, S3 as well as S4.
Switching State Vout Iout
S1 S2 S3 S4 Iout>0 Iout<0
On On Off Off Vs S1 and S2 conduct D1 and D2 conduct
Off Off On On - Vs D4 and D3 conduct S3 and S4 conduct
On Off On Off 0 S1 and D3 conduct D1 and S3 conduct
Off On Off On 0 D4 and S2 conduct S4 and D2 conduct
Off Off Off Off - Vs D4 and D3 conduct
Off Off Off Off Vs D1 and D2 conduct
Table 1: Switches States For single Phase Full Bride Voltage Source Inverter (VSI)
The DC to AC converter transforms the DC power to respective AC power at the
expected output voltages or frequencies. These DC power inputs to inverter were gained from
the pre existing power supply networks or from the rotating alternators through a specific
rectifier or battery, photovoltaic arrays, fuel cells, or the magneto hydrodynamic generators. I
noted that the output voltage of the inverters was controlled for fulfilling the loads
requirements.

Figure 2: Schematic Diagram for Inverter System
CE 2.3.2 Engineering knowledge and skills applied in the project
The first and the foremost skill applied here is the circuit designing. This particular
skill helped me in designing the circuit diagram of this single-phase full bridge inverter. I
even used my skill of Multisim software for completing this design. The other skills that I
have applied here are complex problem solving and critical thinking. I have also applied my
knowledge of voltage calculation and power consumption.
CE 2.3.3 Accomplishment and Task Performed
I have used Multisim software for designing the single phase inverter. I selected the
methodology on the basis of system development and optimization output voltage.

Figure 3: Overview of the Methodology of Flow Chart
I have executed the entire project methodology as the above provided flow chart. I
kept the magnitude of my output voltages from an inverter constant, by PWM control. I had
to determine the value of all parameters for this inverter with resistive load.
Parameters Values
Voltage Input, Vs( V) 12
Voltage output Vo(Vp-p) 24 Vp-p
Duty Cycle, D 0.5
Switching Frequency, f(Hz) 50 Hz
Resistance, R(Ω) R1= 10K R2= 100K R3=100
R4=100
Capacitor C(μF) C1= 10nF C2= 100nF C3= 10uF C4=

2200uF C5= 1uF C6= 10nF
Inductor L(mH) L1= 1uF
Table 2: Value of Parameters
For the simulation of this circuit, I used Multisim software. The desired input voltage
was 12v and various design approaches were being used here. The results were as desired.
The frequency came out 50Hz with 100 Ω load attached for R1=10k and RV = 50%. I have
gained 24 AC outputs with extremely lesser harmonics surge and noise efficiency.
CE 2.3.4 Identified issues and their solutions
2.3.4.1 Issues
The major issue that I have faced here was while connecting the four switches. I was
not getting proper output and the circuit was providing erroneous results. Since, the four
switches in my single phase full bridge inverter were unidirectional, the current were
conducted in one direction. Due to this issue, I could not connect the switches in the given
time period and for the time out, the results were not proper. The next issue that I had faced
here was while employing thyristors as switches. I was unable to complete the circuit design
properly.
2.3.4.2 Solutions
I gave the suggestion to use a 50% duty cycle for switching the S1 – S2 and S3 – S4
in the on and off mode. After connecting the T1 and T2 as well as T3 and T4, the input
voltages VS and -VS came out perfect and out problem were solved. I even evaluated the input
current according to this design. For the next issue of thyristors, I used some kind of forced
commutations, while these VSIs were made after utilizing the GTO, MOSFET and power
transistor.

CE 2.3.5 Plan to produce creative and innovative work
While reviewing as well as analyzing the previous researches on electric circuit and
Multisim software utilization, I have made the significant plan to produce the most creative
as well as innovative work. Being a responsible team member of the project, I made sure that
I have a complete idea regarding the previous experiments and their results.
CE 2.3.6 Collaborative Work
I needed to consider each team members for cooperate them in project context. I took
individual perspectives and ideas while I was designing along the project. Individual ideas
and concepts were really useful for getting better insight of the project alongside the effective
utilization of resources. I required conducting meetings with project managers for suitable
communication planning and information sharing. I took communication planning process for
best practice of information flow among the team members and stakeholders.
CE 2.4 Project Review
CE 2.4.1 Project Overview
I have successfully proposed a design for the single phase full bridge inverter. The
project was completed suitably within timeline. The project was successfully executed with
detailed design and procedures following. I have used Multisim software to propose a
complete design of the inverter.
CE 2.4.2 My Contribution to work
My main contribution to the work was to use my electronics knowledge for making a
design of single phase inverter. Before successfully completing this project, I have used my
core knowledge and skills to bring out perfect and error free results. I even helped my team

members in this project to clear their doubts. Moreover, I recommended my views as well for
continuing the project properly.