Digital Autotransformer

Abstract

Now-a-days in many industries, line varying condition is handled by adjusting the rheostat knob of the autotransformer. This method has limitation i.e. human error while varying the potentiometer  and Parallax error while taking the readings .The method is also time consuming. The scope of this project is to design a variable power supply using microcontroller and the power supply which is used in various applications. Thus the problem can be eliminated using automatically controlled autotransformer using dc servomotor i.e. 'digital autotransformer''.Automatic control will be achieved using digital feedback through a microcontroller and DC Motor. The direction of rotation of the DC-Motor is controlled by signals provided by the microcontroller.This technique of auto transformation by using digital feedback can be  used as variable ac power supply and also to test the machines in the industry. The design of the system is simple and easy to implement.  Through this work, we are expecting to get stable voltage at the output.