Operational Amplifier based Control Circuit for Single Phase Multiple PWM Inverter for Induction Motor Drive Application

Abstract

This article explores the variable speed of a single phase induction motor by varying supply frequency with the help of Multiple Pulse Width Modulation based Inverter. In PWM voltage source inverter the variation of both voltages to frequency should be done simultaneously to keep their ratio constant. In this investigation a simple novel control circuit is adopted using OPAMP. The PWM AC motor drives are widely used to control the speed of conveyor systems, blower, pump, and other industrial applications. The Multiple PWM inverter system using IGBTs improves power factor and provides required variable speed. The multiple PWM topologies along with the proposed control circuit are analyzed through ‘Multisim’ simulation.