DESIGN AND FABRICATION OF A 1.5KVA PURE SINE WAVE INVERTER SYSTEM

ABSTRACT

This thesis is titled the design and fabrication of a 1.5KVA pure sine wave inverter system. Pure sine 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, but it will also ensure that appliances run smoothly, producing less heat and noise. Pure sine wave inverter takes up 12v DC from a 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 a 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 1.5KVA inverter was achieved by using a transformer, an SG3524N PWM fixed frequency voltage regulator controller, MOSFET transistors, one 100AH 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-WidthModulator (PWM) 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 the table of results; the inverter was able to maintain stability for 1 hour when loads up to 1000W were connected to it. Overall, the inverter system performed to good effect.