Design and Construction of a Microcontroller-Based ac Power Control System

Design and Construction of a Microcontroller-Based ac Power Control System
Authors : Akinkuade S. T, Itakorode O. D
Publication Date: 04-11-2014


Author(s):  Akinkuade S. T, Itakorode O. D

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Vol. 3 - Issue 11 (November - 2014)

e-ISSN:   2278-0181


One of the numerous ways through which sophistication can be introduced into an electrical system is by providing users with some form of electronic power control; so that the level of illumination in a room, speed of food mixers, electric drills, sewing machines and heat generated by a heating element in an oven or incubators can be controlled with better accuracy and efficiency. The use of RC network in controlling the firing angle of a Silicon Controlled Rectifier(SCR) and Triac in power control circuits is limited to 𝟗𝟎°, an attempt to increase the angle to 18𝟎° makes circuits to be complex and less reliable. The quest for possibility of controlling the ac power that is delivered to a load in the entire period of each half-cycle of a sinusoidal voltage prompts the use of a microcontroller in this work. A microcontroller; AT 80C52 was used to adjust the firing angle of a Triac; BT 136-600E in ten equal steps within each half-cycle of the mains ac voltage (220 V, 50Hz). The results indicate that firing angles between 𝟎° and 18𝟎° can be obtained using the circuit.


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