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Industrial Power Control by Integral Cycle Switching without Generating Harmonics

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.

Extensive audio-visuals available.
Branding-free material.
Call/mail for Tech Support from 10 am - 7 pm.
Pre-programmed Microcontroller.
All-inclusive solution kit.
Easy to use, Self-explanatory kit.
Hardware Requirements
  • 8051 series Microcontroller
  • Op-amp
  • Opto-isolator
  • Resistors
  • Capacitors
  • Diodes
  • Voltage Regulator
  • LED
  • Crystal
  • LCD
  • Lamp
Software Requirements
  • Keil compiler
  • Language: Embedded C or Assembly
Q & A
Q:  What is cycle stealing?
A:  Cycle stealing is a technique to control power to a load by removing the portion of cycle or cycles from the AC supply
Q:  Which microcontroller is used in this project?
A:  A 40 pin microcontroller from 8051 family is used in this project.
Q:  Can I use a motor instead of the lamp?
A:  Yes, up to ¼HP 230V AC motor can be used, instead of a lamp.
Q:  Which thyristor is used?
A:  TRIAC BT136 is used as the thyristor.
Average Rating
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Showing 3 of 3 reviews
Rejilal M, Kollam on 22nd May, 2015, 11:02 AM

I got to know about Edgefx while I was searching for wireless projects in Google.Since Edgefx is providing Readymade kit also so decided to buy my project from Edgefx. I liked the explanation of video in one word it’s Excellent.The kit got delivered to me in right time with all the components. I will refer Edgefx to others also because the kit is helpful.

ShabeebMamu, Calicut on 27th May, 2014, 06:37 PM

I decided to buy a kit from Edgefx because we can do the projects by our own through which we can gain practical knowledge.I like the most in my project is the Audiovisuals where the explanation about the connections was good.

Sukumar, on 7th November, 2012, 11:45 PM

The audio visuals have given very good idea about how to connect the circuits and their working performance. Thanks to Edgefx.

Rating Breakdown (3 Reviews)

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