AC PHASE FIRING CIRCUIT USING MICROCONTROLLER

Abstract

AC Voltage is controlled using Phase firing signals. This signal is generated using Microcontroller. One
Potentiometer is connected to microcontroller for the setting the values of phase firing angle. Zero Crossing Detector
(ZCD) is used for the sensing of zero voltage of AC Voltage. Based on the Rising Edge and Falling Edge of ZCD
microcontroller it generates gate signals for TRIAC Power circuit. For the isolation between Power circuit and control
circuit Opto isolator is used. These isolated signals are given to the TRIAC and then AC Voltage is controlled.