DESIGN AND FABRICATION OF 2.5KVA PURE SINE WAVE INVERTER SYSTEM

ABSTRACT

This project is titled the design and construction of a pure sine wave inverter system. Pure sine wave inverters produce a pure sine wave output.  This means the power output from a pure sine wave inverter is the same as the mains supply. What you may not know is that not all inverters are created equal. The output from many inverters is a modified sine wave, inferior to the 240 volt mains power supply. Pure sine wave inverters produce a pure sine wave output.
A pure sine wave is not only critical for the correct functioning of high end electronic equipment, it will also ensure that appliances run more smoothly, producing less heat and noise. Pure sine wave inverter takes up 12v DC from battery and inverts it to an output of 220v, 50Hz AC. It makes no noise during operation and no hazardous carbon monoxide is generated in the surrounding.  This is a feature that makes it safe to use anywhere when compared to generator. Also, the circuit is capable of charging the battery (i.e. 12v source) when the power from the supply authority is on. This greatly reduces the cost of operation of the system. A 2.5KVA inverter was achieved by using a transformer, an SG3524N PMW fixed frequency voltage regulator controller, MOSFET transistors, two 200AH deep cycle battery, and a charge controller to monitor the output of the battery for safety. The battery is connected to the inverter circuit to generate 220V alternating current in its output via a step-up transformer. The inverter uses the SG 3524N IC chip fixed frequency Pulse–Width-Modulator (PMW) Voltage regulator controller. The designed oscillation period is set at 50% duty cycle or 0.02 seconds to match the frequency of loads connected to it. From table of results; the inverter was able to maintain stability for 4 hours when loads up to a 2000W were connected to it.