Digitally Controlled Single Phase Transformer Based Inverter For Nonlinear Load Application

The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. Inverters can be broadly classified into single level inverter and multilevel inverter. Multilevel inverter as compared to single level inverters have advantages like minimum harmonic distortion, reduced EMI/RFI generation and can operate on several voltage levels. A multi-stage inverter is being utilized for multipurpose applications, such as active power filters, static var compensators and machine drives for sinusoidal and trapezoidal current applications. The drawbacks are the isolated power supplies required for each one of the stages of the multi-converter and it’s also lot harder to build, more expensive, harder to control in software. This project is designed to monitor and switching the inverter by means of providing a password. The design of this project is a much improved version of the digital code lock which comes with a user defined password and LCD display. The user will be prompted to set a password at installation. This password inputted at installation will continue to serve the lock until it is changed. By inputting the preset password in the system the inverter will be switched ON through relay circuit.