The Design And Construction Of A Dc To Ac Power
Inverter Incorporated With An Automatic Switch
Over Battery Charger
TABLE OF CONTENT
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
TABLE OF CONTENT
CHAPTER ONE
1.1
Introduction
CHAPTER TWO
INVERTER AND THEIR OPERATION
2.1
Emitter
2.2
Base
2.3
Collector
2.4
Transistor Biasing
2.5
Important Biasing Rule
2.6
Transistor Currents
2.7
Summing Up
2.8
Transformer fundamentals
CHAPTER THREE
OPERATION AND DESIGN CONSIDERATIONS
3.0
Features of the Device
3.1 Dc supply unit
3.2 Inverter Unit
3.3 Step up Transformer Unit
3.4 Filter Unit
3.5 Triggering Unit
3.6 Battery Charging Unit
3.7 Switching Unit
3.8 Design
3.9 Inverter
3.10 Operation of the Device
3.11 General Circuit Diagram
CHAPTER FOUR
4.0
Construction
4.1
Packaging
CHAPTER FIVE
5.0
Conclusion
5.1
Performance of the Designed
5.2
Power Inverter
5.3
Reference
CHAPTER ONE
INTRODUCTION
All modern engineering system include certain aspects of control systems
at some point in their broadcast sense, control engineering and
the
associated theory are concerned with the means by which systems may be
made to behave an a desired way.
The system on this thesis is a DC – AC converter, which is an
apparatus which is used for conversion of Direct Current to Alternating
Current or signal.
In our country, this equipment is not all that in used not because it
is not important but because people never give it a thought as per the
construction and design.
It is meant, use with a 12v lead acid battery. If it’s in a car for
example a suitable output voltage of 230v AC is obtainable.
This output voltage of 230v AC can be used for powering small
electrical appliances such as light, electric fans, radio, soldering iron etc.
However, it is worthwhile that AC operated with this appliance is nothing
comparable to the AC generated by big generators. This is so because the
voltage and power are less in terms of AC generation duration. This
appliance is therefore suitable for short time replacement for the real AC
generation especially in the remote areas and install where electrical
appliances are sold and the need might arise for it to be tested and
certified good.
Another main area where this equipment can be of great utility is in
communication system. in a situation where there is constant AC power
supply failure e.g in offices, DC – AC converter is need and in such cases
can be used as a light sources.
Most industries in the country do not make use of DC – AC
converter because they are thought to be costly with respect to the task
they perform. However, putting into consideration the task this appliance
can be used for, it can be concluded that it is cheaper. The construction is
simple, cheaper easy to operate and portable. The usefulness of this
device and the function cannot to be over emphasize now in our
economic situation and also when our power generating authority
(NEPA) has been dubbed NEVER EXPECT POWER ALWAYS.
In these times when control and monitor a complex field engineering
operations have gone computer based, a failure of AC power supply to
communication equipment means work stoppage and to some small scale
industries a lot of economic and material losses avoidable. To this end,
the equipment (DC-AC Converter) is incorporated to an impulse sealer
machine which has about 3 sections where the,
First stage is of the dimmer switch with regulates, the rate at which the
power flow is needed. The second stage being the main switch(s) which
controls the primary side, secondary side of the transformer, the stage 3
comprise of the element made of construction wire which does or finishes
the work needed for the machine.
The specific area of application are :1. In a building where a specific amount of power supply is needed
2. In a small scale industry
3. In overhead water storage tanks in our home
4. In a telecommunication office.
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