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TITLE PAGE

DESIGN AND CONSTRUCTION OF A TRANSFORMER LESS POWER INVERTER

BY

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EE/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---

DECEMBER,2018

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APPROVAL PAGE

This is to certify that the research work, "design and construction of a transformer less power inverter" by ---, Reg. No. EE/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.

By
---                                                     . ---
Supervisor                                                  Head of Department.
Signature……………….                           Signature……………….        

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External Invigilator

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DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.

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ACKNOWLEDGEMENT

The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. I also recognize the support of some of the staff of --- among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. --- and the ---. Finally, my appreciation goes to my elder sister ---, my lovely friends mercy ---, ---, --- and many others who were quite helpful.

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PROJECT DESCRIPTION: This work "design and construction of a transformer less power inverter" research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. We made Preliminary pages, Abstract and Chapter one of "design and construction of a transformer less power inverter" visible for everyone, then the complete material on "design and construction of a transformer less power inverter" is to be ordered for. Happy viewing!!!

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This project is titled the design and construction of a DC to AC inverter system. It is designed to meet up with the power demand in the offices, industries and in homes in the absence of power supply from the power grid. In order words the device serves as a substitute for national grid which almost monopolises the power supply to people.
This work is aimed at building a transformerless inverter that converts direct current (DC) into an alternating current (AC) suitable for injecting into an electrical power grid without using transformer that can be used to power appliances both in homes and industries. It is designed in such a way that it will take high voltage DC from battery and inverts it to an output of 230v, 50Hz AC. It makes no noise during operation and no hazardous carbon monoxide is generated in the surrounding.    

CHAPTER ONE
1.0                                          INTRODUCTION
1.1                            BACKGROUND OF THE STUDY
Electricity supply is one the economic infrastructural facilities that are indispensable to a nation’s economic development. The efficiency of the supply of electricity will not only influence returns on investment on existing enterprises, it also plays a major role in the creation of an economic environment which influences decisions on potential investment.
The electricity which is the main source of power for our domestic consumption, industrial development, learning centres and medical centre should really be rehabilitated into enhancement of productivity.
However power failure has resulted in people buying generators for their own daily activity. Other businesses are also not functioning due to absence of constant power supply. These are the reasons that necessitate the designing and construction of inverter and other standby system that can deliver maximum output power to the load. As society grows from simple to complex, mankind began to spread all over the earth and so it becomes necessary  to enjoy power using inverter.
A power inverter converts DC power, to standard AC power (alternating current). Inverters are used to operate electrical equipment from the power produced by a car or boat battery or renewable energy sources, like solar panels or wind turbines. DC power is what batteries store, while AC power is what most electrical appliances need to run so an inverter is necessary to convert the power into a usable form.
In this work, we are building a transformerless inverter. As the name suggests, the inverter is not equipped with a standard step-up transformer like traditional inverter for converting low voltage AC to high voltage AC.
Transformer-less inverters utilizes high voltage DC as input which is converted to high voltage AC output by oscillators and H-bridge drivers, since there is no transformer great efficiency more than 97% is achievable, the only loss is from the MOSFETs of H-bridge. The high voltage DC source can be solar panels or battery.

1.2                                                  PROBLEM STATEMENT
Traditionally, dc to ac power inversion is always achieved by using a step up transformer and this makes the whole system bulky, cost effective, heavy and inefficient due to iron core losses. The invention of transformerless power inverter came to solve this problem. Transformer-less inverter are relatively inexpensive due to absence of bulky iron core transformer which is the most expensive part of the inverter and now, there are no losses related to transformer so more efficiency. Now the inverter gets lighter and makes it portable which makes less challenging to install.

1.3                                           AIM OF THE PROJECT
The aim of this work is to converts direct current (DC) into an alternating current (AC) suitable for injecting into an electrical power grid without using transformer.

1.4                                              PURPOSE OF THE PROJECT
The main purpose of carrying out this work is to reduce cost, size, and weight, but also increases the whole system efficiency of an inverter.

1.5                                              ADVANTAGES OF PROJECT
Transformerless inverters are being widely used in grid-connected photovoltaic (PV) generation systems. Transformer elimination, in grid-connected PV systems, has many advantages. This not only reduces cost, size, and weight, but also increases the whole system efficiency.

1.6                                          APPLICATION OF THE PROJECT
Transformerless inverters are used between local electrical power generators for solar panel, wind turbine, hydro-electric, and the grid.

1.7                                           LIMITATION OF THE PROJECT

1. Power inverter don't offer isolation from the HV line and present more of a safety issue. 
2. Square wave is not suitable many medical and sensitive electronics equipments.
3. Need huge battery bank / long solar panel array to meet the voltage needs.
4. Need separate battery source for oscillator.
5. Battery discharge rate affects output AC voltage (240V to 210V).

1.8                                         METHODOLOGY
To achieve the aim and objectives of this work, the following are the steps involved:

1. Study of the previous work on the project so as to improve it efficiency.
2. Draw a block diagram.
3. Test for continuity of components and devices,
4. Design and calculation for the device was carried out.
5. Studying of various component used in circuit.
6. Construction of the circuit was carried out.
7. Finally, the whole device was cased and final test was carried out.

1.9                                        PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a transformerless power inverter. In this chapter, the background, significance, objective limitation and problem of a power inverter were discussed.
Chapter two is on literature review of a transformerless power inverter. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.

SYSTEM CIRCUIT DIAGRAM
The circuit diagram of the device is as below:

Fig.1: Transformerless power inverter circuit diagram

SYSTEM BLOCK DIAGRAM
Before carrying out any project, the block diagram must be drawn and fully understood. Block diagram gives a pictorial understanding of any work. The block diagram of the system is as below:

Fig.2: Transformerless power inverter block diagram

BILL OF ENGINEERING MEASUREMENTS AND EVALUATION

The expenditure made in purchasing all the components / materials and quantity used in building this project should be tabulated by the designer.

S/N	DESCRIPTION	QUANTITY	UNIT PRICE (N)	COST (N)	REMARK
1	MOSFET	4	800	3200	IRF740
2	SWITCH	2	400	400	TOGGLE
3	RESISTORS	4	20	80	½ W
5	TRANSISTOR	2	50	100	BC548
6	CONNECTING WIRE	6YARDS	100	600
7	FUSE	1	300	300	8A
8	BATTERY	20	3000	60000	12V/7Ah
10	CASING			4000
11	LOCAL TRANSPORT			3000
12	MULTIMETER	1	1000	1000
13	SOLDERING IRON	1	500	500	100W
14	SOLDERING LEAD	3YRDS	50	150
GRAND TOTAL

references

https://electronics-project-hub.com/simple-transformer-less-inverter-circuit-1000-watt/

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CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and construction of a transformer less power inverter" is also available. Order full work to download. Chapter two of "design and construction of a transformer less power inverter" consists of the literature review. In this chapter all the related work on "design and construction of a transformer less power inverter" was reviewed.

CHAPTER THREE: The complete chapter three of "design and construction of a transformer less power inverter" is available. Order full work to download. Chapter three of "design and construction of a transformer less power inverter" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.

CHAPTER FOUR: The complete chapter four of "design and construction of a transformer less power inverter" is available. Order full work to download. Chapter four of "design and construction of a transformer less power inverter" consists of all the test conducted during the work and the result gotten after the whole work

CHAPTER FIVE: The complete chapter five of design and construction of a "design and construction of a transformer less power inverter" is available. Order full work to download. Chapter five of "design and construction of a transformer less power inverter" consist of conclusion, recommendation and references.

 

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