Abstract
In this proposed system, two zero crossing detectors are used for detecting zero crossing of voltage and current. The project is meant to attenuate penalty for industrial units using automatic power factor correction unit. The microcontroller utilized during this project belongs to 8051 family. The interruption between the zero-voltage pulse and zero-current pulse is duly generated by suitable operational amplifier circuits in comparator mode is fed to 2 interrupt pins of a microcontroller. The program takes over to actuate appropriate number of relays from its output to bring shunt capacitors into load circuit to urge the facility factor till it reaches near unity. The capacitor bank and relays are interfaced to the microcontroller employing a relay driver. It displays delay between this and voltage on an LCD. Furthermore, the project is enhanced by using thyristor control switches rather than relay control to avoid contact pitting often encountered by switching of capacitors because of high in rush current.
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