CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY
The quest to convert D.C. power to A.C power to run some essential appliances results due to erratic power supply being experience. Although, between the 19th century to mid 20th century, D.C. to AC power conversion was accomplished using rotary converters or motor generator set (M-G set). In early 20th century, vacuum tubes and gas filled tubes began to be used as switches in inverter circuit. In contrast the early A.C. to D.C. converters used an induction or synchronous a.c motor directly connected to a generator (dynomo) so that the generator’s commutator reverses its connections at exactly the right moments to produce D.C.
Considering the above reasons, for the study, many electrical equipments have either developed a problem or even stopped working entirely. As a result, many businesses have been crippled thereby affecting the economy as a whole with respect to Nigeria.
Again, power disturbances occurrence are on increase resulting to high voltage spikes and momentary voltage drops, this often affect the performance of sensitive electrical electronics equipment.
Unincessant supply of electric power can not be over-
emphasized in Nigeria presently, this has become the order of the day and many Nigerians now presume power outages as a normal routine in the power sector. There are factors responsible for this ugly situation such as natural disasters, vandalism, maintainability, sustainability, inadequacy and lack of vision by the political leaders to invest adequately in power sector, also absence of replacement policy resulting in absolute abandon of electrical equipment or project, unsustainable human capacity and inadequate and remuneration system to motivate human resources term to perform well on their course.
The progress made some decades ago in developing alternate source of energy has proved that independent power system are not only possible but as well practical. A wide variety of generating equipment is now available to allow individuals take advantage of any prefer renewable resources of energy. Most of these systems produce only direct current (DC) for a number of reasons and at low voltages. However, it is well known that the alternating current is the greatest and most useful form of current being generated by the power grid due to its advantages over direct current. Thus, most of the appliances and equipment are built using a.c. input source.
Therefore, there arises the need for converting direct current (DC) to an alternating current (A.C.) having a constant frequency. This process is known as inverting.