Function and importance of automatic voltage regulator (AVR) with a constant output voltage

Abstract

The design, construction and characterization of an automatic voltage regulator (AVR) with special range is presented. The system is designed to give a constant output voltage over a certain input voltage range between 90 V and 260 V from public power supply and a power capacity of up to 3000 W output. The device is made up of two main parts: the autotransformer part and the switching circuit part. The auto transformer provides the required tappings for the contacts of the relays while the switching circuit selects the appropriate contacts of the relays as the voltage varies between the designed ranges to give a constant output voltage of 220 V ± 5% of that voltage. The output voltage as a result will be in the range of 210 V and 235 V to provide for ± 5% voltage variation.