The project is designed to achieve
integral cycle switching, a method to remove whole cycle, cycles or
portions of cycles of an AC signal. It is a well-known and old method of
controlling AC power, especially across linear loads such as heaters
used in electric furnace. However the concept of achieving the cycle
stealing of voltage waveform by use of microcontroller can be very
precise as per the program written in assembly / C language so that the
actual time-average voltage or current experienced at the load is
proportionately lower than the whole signal if applied to the load. In
place of a linear load to be used in the output, a series motor or lamp
can be used to verify the output. One side effect of utilizing this
scheme is an imbalance in the input current or voltage waveform as the
cycles are switched on and off across the load.
In this project we are using comparator for zero crossing detection which is fed as an interrupt to microcontroller of 8051 family. Here the microcontroller delivers the output based on the interrupt received as the reference for generating triggering pulses. Using these pulses, we drive the opto-isolators for triggering the TRIAC to achieve integral cycle control as per the input switches interfaced to the microcontroller. A lamp is provided in this project in place of a motor for demonstration purpose.
Further this project can be enhanced by using feedback mechanism to automatically maintain desired output to the load by appropriate cycle stealing.
https://www.youtube.com/watch?time_continue=51&v=WnTuFAtravE
In this project we are using comparator for zero crossing detection which is fed as an interrupt to microcontroller of 8051 family. Here the microcontroller delivers the output based on the interrupt received as the reference for generating triggering pulses. Using these pulses, we drive the opto-isolators for triggering the TRIAC to achieve integral cycle control as per the input switches interfaced to the microcontroller. A lamp is provided in this project in place of a motor for demonstration purpose.
Further this project can be enhanced by using feedback mechanism to automatically maintain desired output to the load by appropriate cycle stealing.
Project Description
This is project is based on embedded systems and is more helpful to EEE Students to complete their engineering. This project is designed to achieve integral cycle switching, a method to remove whole cycle, cycles or portions of cycles of an AC signal.
Figure 1 Industrial Power Control by Integral Cycle Switching without Generating Harmonics
Figure 2 Industrial Power Control by Integral Cycle Switching without Generating Harmonics
