Microcontroller based single phase inverter

Abstract

This paper presents a new scheme of Pure Sinwave Inverters using Pic-18F4620 microcontroller to eliminate the most amount of current harmonics that flows through the whole circuit, and to obtain pure sinwave current at the output load side. The proposed inverter, with lossless harmonic power, gives pure sinusoidal output voltage and current. It is aimed to be used with AC machines, sensitive appliances and home appliances even in the absence of main power supply. Also it can be used in high voltage direct current transmission line and for adjustable speed drives. The proposed microcontroller based inverter converts 12 or 24 V DC input to a pure undistorted 220V or 110V AC output. The total harmonic distortion of this inverter is less than 5% and it meets the IEEE standards, knowing that the most traditional inverters contain harmonics around 20% or more, which are useless to operate sensitive machines such as printers, faxes, photocopier machines and tripping circuits ...etc.